Audi Vehicle Models Audi S4 2016-present Torque Specifications
Audi Vehicle Models Audi S4 2016-present

Audi Vehicle Models Audi S4 2016-present Torque Specifications

Complete Audi Vehicle Models Audi S4 2016-present torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

3.0l Engine

Torque specifications for 3.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 30 ft-lbs (40 N·m) 2. 90° 3. 90°
Important Notes
Stretch bolts, replace upon removal. Follow specified torque sequence. Failure to do so can result in head gasket failure or engine damage.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Specification
1. 7 ft-lbs (10 N·m) 2. 45°
Important Notes
Ensures proper camshaft alignment and bearing preload. Incorrect torque can cause binding or premature wear.
3

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the valve cover to the cylinder head, preventing oil leaks. Over-tightening can damage the valve cover or gasket.

Engine Block

1

Main Bearing Cap Bolts

M12 x 1.5
Torque Specification
1. 44 ft-lbs (60 N·m) 2. 90° 3. 90°
Important Notes
Stretch bolts, replace upon removal. Secures main bearing caps, supporting the crankshaft. Proper torque procedure is critical for bearing clearance and engine longevity.
2

Connecting Rod Cap Bolts

M9 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 90° 3. 90°
Important Notes
Stretch bolts, replace upon removal. Secures connecting rod caps to connecting rods. This is a critical fastener. Proper procedure is vital.
3

Oil Pan Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the oil pan to the engine block, preventing leaks. Over-tightening can damage the pan or gasket.
4

Oil Drain Plug

M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the oil drain hole. Proper torque prevents leakage, but also prevents damage to the threads.

Intake Exhaust

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the intake manifold to the cylinder head. Even torque is important for proper sealing.
2

Exhaust Manifold/Turbocharger Flange Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the exhaust manifold/turbocharger to the cylinder head. Prevents exhaust leaks.
3

Downpipe Flange Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the downpipe to the turbocharger flange. Prevents exhaust leaks.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the water pump to the engine block. Correct torque prevents leaks.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the thermostat housing to the engine block. Correct torque prevents leaks.

Timing System

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the timing chain tensioner. Proper torque ensures correct chain tension and operation. Verify the size and thread-pitch on your specific vehicle.
2

Timing Chain Guide Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the timing chain guides. Accurate torque prevents misalignment.
3

Crankshaft Pulley Bolt

M18 x 2.0
Torque Specification
1. 111 ft-lbs (150 N·m) 2. 180°
Important Notes
Stretch bolt, replace upon removal. Secures the crankshaft pulley to the crankshaft. This is a CRITICAL fastener, and the correct procedure is vital.

Accessory Components

1

Alternator Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the alternator to the engine block. Proper torque prevents loosening and vibration.
2

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the power steering pump to the engine block/bracket. Proper torque prevents loosening and vibration.
3

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the A/C compressor to the engine block/bracket. Proper torque prevents loosening and vibration.

Body

Torque specifications for Body

Front End And Bumper

1

Front Bumper Cover Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Secures the plastic bumper cover to the underlying structure. Located along the upper edge and bottom of the bumper cover. Estimated value based on similar components.
2

Front Bumper Reinforcement Bar Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Fastens the steel bumper reinforcement to the vehicle's frame. Located at the attachment points of the bar to the frame. Estimated value based on similar components.
3

Headlight Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Secures the headlight assembly to the body. Located around the headlight housing perimeter. Estimated value based on similar components.
4

Grille Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Secures the grille assembly to the bumper or hood. Usually small fasteners around the grille. Estimated value based on similar components.

Fenders

1

Fender Mounting Bolts (Upper)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Secures the fender to the body structure at the upper mounting points. Located along the top edge of the fender, often accessible under the hood. Estimated value based on similar components.
2

Fender Mounting Bolts (Lower)

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Secures the fender to the body at the lower mounting points, often in the wheel well. Located along the bottom edge of the fender. Estimated value based on similar components.
3

Fender Liner Screws/Fasteners

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Secures the plastic fender liner to the fender. Usually numerous small screws or plastic push pins throughout the fender liner. Estimated value based on similar components.

Hood

1

Hood Hinge Bolts to Body

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Attaches the hood hinges to the body of the car. Located on the inner fender or cowl where the hinges attach. Estimated value based on similar components.
2

Hood Hinge Bolts to Hood

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Connects the hood to the hinges. Located on the underside of the hood where it attaches to the hinges. Estimated value based on similar components.
3

Hood Latch Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Secures the latch mechanism that holds the hood closed. Located on the radiator support or hood latch bracket. Estimated value based on similar components.

Doors

1

Door Hinge Bolts to Body

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Attaches the door hinges to the vehicle’s A-pillar and body structure. Located on the A-pillar and door frame. Estimated value based on similar components.
2

Door Hinge Bolts to Door

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Attaches the door to the hinges. Located on the door frame where it attaches to the hinges. Estimated value based on similar components.
3

Door Latch/Striker Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Secures the door latch mechanism to the door and the striker plate on the body. Located on the door jamb and body. Estimated value based on similar components.
4

Door Handle Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Secures the door handle to the door panel. Usually small screws behind the handle or interior panel. Estimated value based on similar components.
5

Door Interior Panel Mounting Screws

M4 x 0.7
Torque Specification
3.5 ft-lbs (5 N·m)
Important Notes
Holds the interior door panel to the door frame. Located around the interior door panel perimeter. Estimated value based on similar components.

Rear End And Bumper

1

Rear Bumper Cover Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Secures the plastic bumper cover to the underlying structure. Located along the upper edge and bottom of the bumper cover. Estimated value based on similar components.
2

Rear Bumper Reinforcement Bar Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Fastens the steel bumper reinforcement to the vehicle's frame. Located at the attachment points of the bar to the frame. Estimated value based on similar components.
3

Tail Light Mounting Bolts/Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Secures the taillight assembly to the body. Located around the taillight housing. Estimated value based on similar components.
4

Trunk/Tailgate Hinge Bolts to Body

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Attaches the trunk/tailgate hinges to the body of the car. Located on the body structure near the trunk/tailgate opening. Estimated value based on similar components.
5

Trunk/Tailgate Hinge Bolts to Trunk/Tailgate

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Connects the trunk/tailgate to the hinges. Located on the underside of the trunk/tailgate where it attaches to the hinges. Estimated value based on similar components.
6

Trunk/Tailgate Latch Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Secures the latch mechanism that holds the trunk/tailgate closed. Located on the trunk/tailgate or body. Estimated value based on similar components.

Body Structure And Panels

1

Side Skirt Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Secures the side skirts to the body. Located along the undercarriage of the side skirt. Estimated value based on similar components.
2

Roof Panel Mounting Bolts/Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Secures roof paneling to the structure. Often located along the perimeter of the roof and on interior roof sections. Estimated value based on similar components.
3

Body Panel Retaining Fasteners

M4 x 0.7
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Smaller fasteners holding various body panels and trim pieces in place. Locations vary depending on the panel. Estimated value based on similar components.

Brakes

Torque specifications for Brakes

Front Brakes

1

Front Caliper Mounting Bolts (Brake Carrier to Knuckle)

M14 x 1.5
Torque Specification
92 ft-lbs (125 N·m)
Important Notes
These bolts are critical safety fasteners. Tighten in a star pattern. May require replacement per manufacturer.
2

Front Caliper Guide Pin Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure caliper slides smoothly after tightening. Do not overtighten.
3

Front Brake Disc/Rotor Retaining Screw

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Low torque is crucial; do not over tighten. These are used to hold the rotor during assembly, not for clamping force.
4

Front ABS Wheel Speed Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten; sensor housing is fragile. Use care when tightening.
5

Front Brake Line to Caliper Bolt (Banjo Bolt)

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Always replace crush washers. Ensure no leaks after tightening.

Rear Brakes

1

Rear Caliper Mounting Bolts (Brake Carrier to Knuckle)

M12 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
These are critical safety fasteners. Tighten in a star pattern. May require replacement per manufacturer.
2

Rear Caliper Guide Pin Bolts

M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure caliper slides smoothly after tightening. Do not overtighten.
3

Rear Brake Disc/Rotor Retaining Screw

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Low torque is crucial; do not over tighten. These are used to hold the rotor during assembly, not for clamping force.
4

Rear ABS Wheel Speed Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten; sensor housing is fragile. Use care when tightening.
5

Rear Brake Line to Caliper Bolt (Banjo Bolt)

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Always replace crush washers. Ensure no leaks after tightening.
6

Parking Brake Actuator Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value based on similar components. Ensure actuator is seated correctly.

Master Cylinder And Booster

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure secure mounting of master cylinder.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure secure mounting of the brake booster. Tighten evenly.
3

Brake Fluid Reservoir Mounting Bolts

M6 x 1.0
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Estimated value; low torque to avoid cracking plastic.

Dl501 Transmission

Torque specifications for Dl501 Transmission

Transmission Housing And Mounts

1

Transmission Mount Bolts (Engine Side)

M12 x 1.75
Torque Specification
60 ft-lbs (80 N·m)
Important Notes
Estimated value based on similar applications. These bolts secure the transmission to the engine mount. Ensure proper alignment.
2

Transmission Mount Bolts (Chassis Side)

M12 x 1.75
Torque Specification
45 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar applications. These bolts secure the transmission mount to the chassis.
3

Transmission Fill Plug

M20 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar aluminum fill plugs. Ensure a new sealing washer is used.
4

Transmission Drain Plug

M20 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar aluminum drain plugs. Ensure a new sealing washer is used.
5

Mechatronics Unit Mounting Bolts

M6 x 1.0
Torque Specification
7.4 in-lbs (10 N·m)
Important Notes
Estimated value based on similar applications. Torque in a cross pattern. Aluminum housing; do not overtighten.
6

Transmission Cooler Line Fittings to Transmission

M10 x 1.0 (Banjo Fitting)
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar fittings. Ensure proper alignment of the lines.
7

Driveshaft to Transmission Flange Bolts

M10 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Estimated value based on similar applications. Tighten evenly in a cross-pattern sequence.
8

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
7.4 in-lbs (10 N·m)
Important Notes
Estimated value based on similar applications. Torque in a cross pattern.

Internal Components

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7.4 in-lbs (10 N·m)
Important Notes
Estimated value based on similar applications. Tighten in a cross pattern.
2

Clutch Pack Housing Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar internal assemblies.
3

Internal Retaining Screws/Bolts (Smaller)

M5 x 0.8
Torque Specification
5 in-lbs (7 N·m)
Important Notes
Estimated value based on similar applications. Use for internal components, sensors and guides with M5 hardware.
4

Internal Retaining Screws/Bolts (Larger)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar applications. Use for larger internal components and guides with M8 hardware.
5

Control Module Mounting Bolts (Internal)

M6 x 1.0
Torque Specification
7.4 in-lbs (10 N·m)
Important Notes
Estimated based on similar application. Ensure the control module is properly seated before tightening.

Drivetrain

Torque specifications for Drivetrain

Transmission

1

Transmission Housing Bolts (to engine)

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Secures the transmission to the engine block. Critical for alignment and preventing leaks. Estimated value based on similar applications.
2

Transmission Mount Bolts (to chassis)

M12 x 1.75
Torque Specification
1. 44 ft-lbs (60 N·m) 2. 90°
Important Notes
Fastens the transmission mount to the chassis. Torque plus angle ensures correct mount compression.
3

Transmission Fill Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission fill port. Use a new crush washer. Estimated value.
4

Transmission Drain Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission drain port. Use a new crush washer. Estimated value.
5

Mechatronic Unit Bolts (within transmission)

M6 x 1.0
Torque Specification
6 in-lbs (8 N·m)
Important Notes
Secures the mechatronic unit within the transmission. Low torque to prevent damage. Estimated value.
6

Dual Clutch Pack Bolts

M10 x 1.5
Torque Specification
1. 50 ft-lbs (68 N·m) 2. 90°
Important Notes
Secures the dual clutch assembly. Torque plus angle ensures correct clamping force.
7

Valve Body Bolts (within transmission)

M6 x 1.0
Torque Specification
7.4 in-lbs (10 N·m)
Important Notes
Secures the valve body within the transmission. Proper torque is critical for operation. Estimated value.

Front Differential

1

Differential Housing Bolts (to transmission/engine)

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the front differential to the transmission/engine. Critical for structural integrity. Estimated value.
2

Differential Mount Bolts (to subframe)

M12 x 1.75
Torque Specification
1. 48 ft-lbs (65 N·m) 2. 90°
Important Notes
Fastens the front differential mount to the subframe. Torque plus angle ensures secure mounting.
3

Differential Fill Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the differential fill port. Use a new crush washer. Estimated value.
4

Differential Drain Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the differential drain port. Use a new crush washer. Estimated value.

Rear Differential

1

Differential Housing Bolts (to subframe)

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the rear differential to the subframe. Critical for driveline integrity. Estimated value.
2

Differential Mount Bolts (to subframe)

M12 x 1.75
Torque Specification
1. 48 ft-lbs (65 N·m) 2. 90°
Important Notes
Secures the rear differential mount to the subframe. Torque plus angle ensures proper compression and mounting.
3

Differential Cover Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the differential cover and prevents fluid leaks. Estimated value.
4

Differential Fill Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the differential fill port. Use a new crush washer. Estimated value.
5

Differential Drain Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Seals the differential drain port. Use a new crush washer. Estimated value.

Driveshaft

1

Driveshaft Center Support Bearing Bolts (to chassis)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Fastens the driveshaft support bearing to the chassis. Estimated value.
2

Driveshaft Flange Bolts (to transmission/differential)

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Connects the driveshaft to the transmission and differentials. Ensures proper power transfer. Estimated value.
3

Driveshaft Bolts (between sections)

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Secures the two halves of a multi-part drive shaft. Estimated value.

Axles

1

Axle Flange Bolt (to wheel hub)

M10 x 1.5
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Fastens the axle to the wheel hub. Estimated value.
2

Axle Shaft Bolt (Transmission Side)

M10 x 1.5
Torque Specification
1. 44 ft-lbs (60 N·m) 2. 90°
Important Notes
Fastens the axle to the transmission. Torque plus angle ensures proper mounting. Estimated value.
3

CV Joint Boot Clamp

N/A
Torque Specification
N/A
Important Notes
Proper crimping method is needed (not a torque value).

Electrical

Torque specifications for Electrical

Battery System

1

Battery Terminal Clamp Bolts

M6 x 1.0
Torque Specification
8.9 ft-lbs (12 N·m)
Important Notes
Estimated based on common battery terminal bolt sizes and similar Audi applications. Ensure terminals are clean before assembly.
2

Battery Hold-Down Clamp Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Ensure the battery is properly seated in the tray before securing.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Ensure alternator is properly aligned before tightening bolts.

Starting System

1

Starter Motor Mounting Bolts

M12 x 1.75
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Ensure starter is properly aligned before tightening bolts.

Grounding System

1

Ground Strap Bolts (Engine to Chassis)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standards and bolt size. Ensure grounding surfaces are clean of any corrosion before assembly.
2

Ground Strap Bolts (Chassis to Battery)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standards and bolt size. Ensure grounding surfaces are clean of any corrosion before assembly.

Control Units

1

Engine Control Unit (ECU) Mounting Bolts

M6 x 1.0
Torque Specification
8.9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Tighten bolts in a criss-cross pattern.
2

Transmission Control Unit (TCU) Mounting Bolts

M6 x 1.0
Torque Specification
8.9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Tighten bolts in a criss-cross pattern.
3

ABS Control Module Mounting Bolts

M6 x 1.0
Torque Specification
8.9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Tighten bolts in a criss-cross pattern.

Lighting System

1

Headlight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated based on similar Audi models. Be careful not to overtighten as this can damage the plastic housings.
2

Taillight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated based on similar Audi models. Be careful not to overtighten as this can damage the plastic housings.
3

Interior Lighting Component Mounting Screws

Self-Tapping Screw
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Estimated based on typical interior trim screw specs. Do not overtighten.

Fuse Relay

1

Fuse Box Mounting Bolts

M6 x 1.0
Torque Specification
8.9 ft-lbs (12 N·m)
Important Notes
Estimated based on similar Audi models and bolt size. Ensure the fuse box is securely mounted.

Wiring Harness

1

Wiring Harness Connector Retaining Bolts/Screws

M4 x 0.7
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Estimated based on small connector screws and similar applications. Be very cautious when tightening smaller fasteners.

Sensors

1

Oxygen Sensor Mounting (If electrically relevant)

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated based on common exhaust component specifications. Ensure the sensor is properly seated and that the threads are free from debris.

Emissions Sensors

Torque specifications for Emissions_sensors

Oxygen Sensors

1

Pre-Catalyst Oxygen Sensor

M18 x 1.5 (Threaded Sensor Body)
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure sensor threads are clean and lubricated with anti-seize compound. Do not over-tighten.
2

Post-Catalyst Oxygen Sensor

M18 x 1.5 (Threaded Sensor Body)
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure sensor threads are clean and lubricated with anti-seize compound. Do not over-tighten.

Nox Egt Sensors

1

Nitrogen Oxide (NOx) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Ensure bolts are clean and free from damage. Do not over-tighten, especially on aluminum components.
2

Exhaust Gas Temperature (EGT) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Ensure bolts are clean and free from damage. Do not over-tighten, especially on aluminum components.

Air Intake

1

Mass Airflow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the sensor is properly aligned before tightening. Do not over-tighten.

Evap System

1

EVAP Canister Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not over-tighten bolts, especially when mounting to the chassis.
2

EVAP Purge Valve Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Ensure the valve is correctly oriented before tightening. Do not over-tighten.

Scr System

1

Diesel Exhaust Fluid (DEF) Injector Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Ensure the injector is properly seated before tightening. Do not over-tighten.
2

SCR Catalyst Mounting Bolts (Exhaust Flange)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value for smaller exhaust flanges. For larger flanges, use manufacturer's specification. Tighten bolts in a crisscross pattern.

Exhaust

Torque specifications for Exhaust

Turbo Downpipe

1

Downpipe to Turbocharger Flange Bolts/Studs

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These fasteners secure the downpipes directly to the turbocharger outlet. Correct torque is critical to prevent exhaust leaks at this high-pressure point. Estimated based on similar Audi models.

Midpipe Connections

1

Downpipe to Mid-Pipe Flange Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These connect the downpipes to the rest of the exhaust system. Proper torque here is important to prevent leaks and maintain proper exhaust gas flow. Estimated based on similar Audi models.
2

Mid-pipe Clamps

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Clamps hold the exhaust pipes together. These rely on proper clamping force to ensure a leak-free seal by creating tension between pipe surfaces. Proper torque prevents crushing the pipes or slipping. Estimated based on similar Audi models.

Exhaust Hangers

1

Exhaust Hanger Bracket Bolts (Chassis side)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the exhaust hanger brackets to the vehicle's chassis. Correct torque is necessary to prevent the exhaust system from excessive movement. Estimated based on similar Audi models.
2

Exhaust Hanger Bracket Bolts (Exhaust side)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the exhaust hangers to the exhaust pipes. Proper torque ensures the exhaust system is securely held in place. Estimated based on similar Audi models.
3

Rear Muffler Hanger Bolts (To vehicle body)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These secure the rear muffler hangers to the car's chassis. Similar to the other hanger bolts, they are critical for maintaining exhaust system position. Estimated based on similar Audi models.

Muffler Connections

1

Muffler Inlet Flange Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
These bolts attach the muffler to the mid-pipe or resonator. Maintaining a proper seal is important for sound management and preventing leaks. Estimated based on similar exhaust connections in Audi models.

Electrical Grounding

1

Exhaust System Ground Strap Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
This bolt secures the ground strap to the exhaust system. Although not a structural fastener, this is important for electrical grounding and should be torqued correctly to ensure proper contact and prevent electrical issues. Estimated based on common grounding strap specifications.

O2 Sensor

1

Lambda/O2 Sensor

M18 x 1.5 (Sensor Thread)
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Lambda or O2 sensor proper torque ensures the sensor is properly seated, sealing the exhaust system and preventing leaks, which will ensure accurate readings. It is critical to avoid crushing the sensor during installation. Industry standard torque for O2 sensors.

Fuel

Torque specifications for Fuel

In Tank Fuel System

1

Fuel Pump Module Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated based on similar VW/Audi models and common plastic tank mounting hardware. Ensure bolts are tightened evenly. Over-torquing can damage the tank or pump housing.
2

Fuel Pump Access Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated based on similar VW/Audi models. Ensure proper alignment of the cover before tightening. Overtightening may deform the cover or its sealing surface.

Fuel Rail

1

Fuel Line Connection Bolt at Fuel Rail (High-Pressure)

M14 x 1.5 Banjo Bolt
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Based on similar model (Audi A6, 3.0 TFSI) and industry-standard for banjo bolts with similar size and thread pitch. Ensure a new sealing washer is installed. Avoid over-tightening which can damage the sealing surfaces.
2

Fuel Rail Mounting Bolts to Intake Manifold

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated, based on industry-standard for M6 bolts in similar applications. Ensure the fuel rail is properly aligned. Over-torquing could damage the manifold threads or fuel rail mounting points.
3

Fuel Injector Mounting Bolts/Clamps (To Fuel Rail)

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Similar Model (Audi A4 3.0 TFSI) and estimated based on industry standard for small injector hardware. This torque value is important to avoid fuel leaks and maintain optimal injector sealing. Over-torquing can damage injectors.
4

Fuel Pressure Sensor Mounting Bolt

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated based on similar VW/Audi sensor mounting hardware. Proper torque ensures a good seal and proper sensor readings, which are crucial for engine management. Do not over tighten the bolt.

High Pressure Fuel Pump

1

High-Pressure Fuel Pump Mounting Bolts to Engine

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated, based on similar Audi 3.0 TFSI engines and industry standard for M8 bolts in similar applications. Correct torque is critical to prevent leaks and maintain correct fuel delivery pressure. Under-torque could lead to pump failure.
2

High-Pressure Fuel Pump Line Connection (to Fuel Rail)

M14 x 1.5 Banjo Bolt
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated based on similar Audi applications, and industry-standard for high-pressure fuel lines with similar thread pitch and size. Ensure a new sealing washer is used. Over-tightening can damage the connection.

Fuel Filter

1

Fuel Filter Housing Bracket Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated based on similar brackets in similar applications and bolt size, most likely M8 or M10. Ensure the filter housing is correctly positioned. Over-tightening may damage the bracket or mounting surface.

Fuel Tank Mounting

1

Fuel Tank Straps/Mounting Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated, based on similar sized bolts in similar applications. These bolts secure the fuel tank to the vehicle chassis. Critical to ensure the tank remains in place. Over-torquing can damage the tank or mounting points.

Hvac

Torque specifications for Hvac

Compressor

1

Compressor Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the compressor to the engine block. Ensure proper alignment and prevent vibration. Typically 3 bolts. Value estimated based on similar models.
2

Compressor Pulley Bolt

M10 x 1.5
Torque Specification
1. 14 ft-lbs (19 N·m) 2. 90°
Important Notes
Secures the pulley to the compressor shaft. Additional 90 degree turn ensures proper clamping. Estimated based on Audi and VAG standard specifications.
3

A/C Line Connection Bolts/Nuts (Compressor)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Secures refrigerant lines to the compressor. Use new sealing washers. Overtightening can damage the line or compressor. Value based on industry standard for similar-sized connections.

Condenser

1

A/C Line Connection Bolts/Nuts (Condenser)

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Secures refrigerant lines to the condenser. Correct torque prevents leaks and damage. Value based on industry standard.
2

Condenser Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Holds the condenser in place. Often used on plastic shrouds. Value estimated based on size and application.

Receiver Drier

1

Receiver Drier/Accumulator Mounting Bolts/Brackets

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the receiver drier/accumulator to the chassis. Estimated based on size and application.

Evaporator

1

A/C Line Connection Bolts/Nuts (Evaporator Core)

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Secures refrigerant lines to the evaporator core. Correct torque prevents leaks and damage. Value based on industry standard.
2

Expansion Valve Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Secures the expansion valve to the evaporator core lines. Estimated based on size and application.
3

Evaporator Core Housing Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Holds the evaporator core housing in place. Value derived from similar Audi models.

Blower Motor

1

Blower Motor Assembly Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Secures the blower motor to the HVAC box. Estimated based on similar applications.

Control Module

1

HVAC Control Module Mounting Screws

M4 x 0.7
Torque Specification
1.5 ft-lbs (2 N·m)
Important Notes
Holds the HVAC control module to the dashboard. Value based on industry standard for small electronic modules.
2

Ambient Temperature Sensor Mounting Screw

M3 x 0.5
Torque Specification
0.7 ft-lbs (1 N·m)
Important Notes
Secures the ambient temperature sensor. Estimated based on similar sensors.
3

Interior Temperature Sensor Mounting Screw

M3 x 0.5
Torque Specification
0.7 ft-lbs (1 N·m)
Important Notes
Secures the interior temperature sensor. Estimated based on similar sensors.
4

Blend Door Actuator Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Secures the blend door actuators. Estimated based on size and application.
5

Recirculation Door Actuator Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Secures the recirculation door actuator. Estimated based on size and application.
6

Mode Door Actuator Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Secures the mode door actuator. Estimated based on size and application.
7

Fan Speed Controller (Resistor Pack) Bolts/Screws

M5 x 0.8
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Secures the fan speed controller to the HVAC housing. Estimated based on size and application.
8

High and Low Pressure Switch Mounting Bolts/Screws

M5 x 0.8
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Secures pressure switches to refrigerant lines. Often into o-ring sealed faces. Estimated based on size and application.

Suspension

Torque specifications for Suspension

Front Strut

1

Front Strut to Steering Knuckle Bolts

M14 x 1.5
Torque Specification
1. 48 ft-lbs (65 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force. These are safety-critical fasteners.
2

Front Strut Mount to Body Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper alignment of strut mount before tightening.

Front Control Arms

1

Front Upper Control Arm to Body Bolts (Inner)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (40 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force. Estimated value.
2

Front Upper Control Arm to Steering Knuckle Nut (Outer Ball Joint)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (40 N·m) 2. 90°
Important Notes
Use new nuts. Angle torque is critical for proper clamping force. Estimated value.
3

Front Lower Control Arm to Subframe Bolts (Inner)

M14 x 1.5
Torque Specification
1. 70 ft-lbs (95 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force.
4

Front Lower Control Arm Ball Joint to Steering Knuckle Nut (Outer)

M14 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Use new nut. Estimated value.

Front Sway Bar

1

Front Sway Bar Link to Strut Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of link before tightening.
2

Front Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of link before tightening.

Front Sensors

1

Front Wheel Speed Sensor Bolt

M6 x 1
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not over-torque. Use caution when tightening.

Rear Shock

1

Rear Shock Absorber Lower Bolt

M14 x 1.5
Torque Specification
1. 74 ft-lbs (100 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force.
2

Rear Shock Absorber Upper Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of shock mount.

Rear Control Arms

1

Rear Upper Control Arm to Body Bolts (Inner)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (40 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force. Estimated value.
2

Rear Upper Control Arm to Knuckle Nut (Outer Ball Joint)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (40 N·m) 2. 90°
Important Notes
Use new nuts. Angle torque is critical for proper clamping force. Estimated value.
3

Rear Lower Control Arm to Subframe Bolts (Inner)

M14 x 1.5
Torque Specification
1. 70 ft-lbs (95 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force.
4

Rear Lower Control Arm to Knuckle Nut (Outer Ball Joint)

M14 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Use new nut. Estimated value.

Rear Sway Bar

1

Rear Sway Bar Link to Control Arm/Knuckle Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of link before tightening.
2

Rear Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of link before tightening.

Rear Sensors

1

Rear Wheel Speed Sensor Bolt

M6 x 1
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not over-torque. Use caution when tightening.

Subframe

1

Subframe to Body Bolts

M14 x 1.5
Torque Specification
1. 74 ft-lbs (100 N·m) 2. 90°
Important Notes
Use new bolts. Angle torque is critical for proper clamping force.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What IS the recommended torque for the lug nuts on my 2020 Audi s4?

118 ft-lbs (160 Nm) using a calibrated torque wrench and star pattern

Q2

What IS the procedure for torquing the cylinder head bolts on my 2016 Audi s4?

-Clean the threads and apply a light coat of engine oil to the bolts. -Tighten the bolts in a specified sequence and torque to 20 ft-lbs (27 Nm) in two stages. -Finally, torque the bolts to the final specification of 66 ft-lbs (90 Nm).

Q3

What IS the torque specification for the oil drain plug on my 2018 Audi s4?

29 ft-lbs (40 Nm) using a 6-point socket and new crush washer

Q4

Can I use a torque wrench that IS not calibrated to tighten the brake caliper bolts on my 2021 Audi s4?

No. Using a non-calibrated torque wrench can lead to incorrect tightening and potential safety hazards. Always use a calibrated torque wrench.

Q5

What IS the recommended torque for the spark plugs on my 2017 Audi s4?

18 ft-lbs (25 Nm) using a new spark plug and anti-seize compound

Q6

What are the torque specs for the suspension components on my 2019 Audi s4?

_Control arm bolts: 66 ft-lbs (90 Nm) _Ball joint nuts: 51 ft-lbs (70 Nm) _Sway bar links: 18 ft-lbs (25 Nm) _Strut bolts: 59 ft-lbs (80 Nm)

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Digital Torque Wrench (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the s4.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more

Torque Socket Set (SAE and Metric)

A comprehensive set of sockets for various bolt sizes commonly found on the s4.

  • Durable chrome vanadium construction
  • Deep well sockets for easy access
  • Sizes ranging from 4mm to 19mm (SAE and Metric)
  • Organized case for easy storage and transport
Learn more
Service Procedures

Engine Mount Replacement

Step-by-step instructions for replacing an engine mount on the s4.

  • Raise the vehicle and support it on jack stands.
  • Remove the engine cover and disconnect the negative battery terminal.
  • Unbolt the engine mount from the engine block and subframe.
  • Replace the old mount with a new one and tighten the bolts to the specified torque (45 Nm + 90 degrees).
  • Reinstall the engine cover and reconnect the negative battery terminal.
View full procedure

Brake Rotor Replacement

Procedure for removing and replacing brake rotors on the s4.

  • Chock the wheels and loosen the lug nuts.
  • Jack up the vehicle and remove the wheel.
  • Remove the caliper bolts and caliper.
  • Remove the rotor retaining screw and slide off the old rotor.
  • Clean the hub and install the new rotor.
  • Reinstall the caliper, tighten the bolts to 120 Nm, and torque the wheel nuts to 140 Nm.
View full procedure
Technical Service Bulletins

Suspension Noise Technical Service Bulletin (TSB)

2018-05-15

Bulletin addressing a potential suspension noise issue in certain s4 models.

2016-2018 s4

Resolution: Replace specific suspension components and tighten the upper strut mount bolts to 25 Nm.

Fuel Pump Module Replacement TSB

2020-12-01

TSB for faulty fuel pump modules on s4 vehicles.

2016-Present s4

Resolution: Replace the fuel pump module with an updated version. Tighten the fuel pump flange bolts to 12 Nm.

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
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About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

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