Audi Audi A5 2007-2016 3.2L Engine Bolt Torque Specifications & Fastener Values
Audi Audi A5 2007-2016

Audi Audi A5 2007-2016 3.2L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 3.2L V6 engine found in the 2007-2016 Audi A5. Includes torque values for various engine components such as cylinder head, intake manifold, and oil pan.

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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

3.2l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in multiple stages following the manufacturer's torque sequence. Always use new bolts when reassembling.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent leaks. Do not overtighten.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper valve train operation.
4

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in a sequence from the center outwards to prevent leaks.

3.2l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Tighten in the correct sequence to ensure proper crankshaft alignment. Always use new bolts or studs if specified.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent leaks. Do not overtighten. Use new gasket or sealant as needed.
3

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure O-ring is correctly seated to prevent leaks.
4

Water Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to ensure proper sealing.
5

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent coolant leaks. Use new gasket or O-ring.

3.2l-engine Connecting Rods

Torque specifications for connecting rod components.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten to the correct torque in a specific sequence to ensure proper bearing crush. Always use new rod nuts or bolts if specified.

3.2l-engine Intake System

Torque specifications for the intake system components.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly in a criss-cross pattern to ensure an airtight seal.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent vacuum leaks.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper sealing.

3.2l-engine Fuel System

Torque specifications for the fuel system components.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to ensure proper fuel rail mounting.
2

Fuel Injector Bolts

M5 x 0.8
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten carefully to avoid damaging the injector. Use new O-rings or seals.
3

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten to ensure secure mounting and prevent fuel leaks.

3.2l-engine Timing System

Torque specifications for timing components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure correct timing belt/chain tension before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Ensure correct timing before final torque.

3.2l-engine Front End Accessories

Torque specifications for front-end accessory drive components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Ensure the pulley is properly seated before tightening. Use new bolt if specified.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure secure mounting.
3

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure the tensioner is correctly positioned before tightening.
4

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure the pulley is correctly aligned before tightening.
5

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to ensure secure mounting.
6

Alternator Mounting Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten evenly to ensure secure mounting.
7

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to ensure secure mounting.

3.2l-engine Sensors

Torque specifications for engine sensors.

1

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten carefully to avoid damaging the sensor.
2

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten carefully to avoid damaging the sensor.
3

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor is properly seated for accurate readings.
4

Oil Pressure Sensor/Switch

M10 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten carefully to avoid damaging the sensor.
5

Coolant Temperature Sensor

M10 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor is properly seated to avoid coolant leaks.

3.2l-engine Vvt Pcv

Torque specifications for VVT and PCV components.

1

Variable Valve Timing Solenoid/Actuator Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to avoid leaks. Ensure proper mounting of the solenoid.
2

PCV Valve Bolts (If Applicable)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten to prevent vacuum leaks.

3.2l-engine Misc

Torque specifications for misc engine components.

1

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer to ensure proper sealing to prevent oil leaks.
2

Spark Plugs

M14 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Do not overtighten. Use anti-seize on spark plug threads, if needed.
3

Flywheel Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure proper seating.

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

Why are correct torque specifications important for the 3.2L engine?

Using the correct torque specifications ensures that components are securely fastened without being over-tightened, which could damage threads or cause stress fractures. Under-tightening can lead to leaks or component failure, particularly in high-vibration areas like the engine. For example, using too little torque on cylinder head bolts can lead to head gasket failure, while over-tightening them can damage the block or warp the head.

Q2

What happens if I over-torque or under-torque a bolt?

Over-torquing can strip threads, stretch bolts beyond their yield point, and damage the component being fastened. Under-torquing can cause fasteners to loosen over time, leading to leaks, vibrations, or component failure. For example, an oil pan bolt that's not tightened enough could lead to a major oil leak, while an over-tightened bolt might crack the oil pan.

Q3

Do I need to replace bolts when working on the 3.2L engine?

Some fasteners, especially those subject to stretching (like cylinder head bolts), are designed to be used only once and MUST be replaced. Always consult the vehicle's service manual for specific recommendations. Using old, stretched bolts can result in improper clamping force even if torqued correctly. Consider replacing critical bolts like those securing the timing chain components or main bearing caps.

Q4

What kind of torque wrench should I use for these specifications?

A calibrated torque wrench is essential for achieving accurate torque readings. Use a 3/8" drive torque wrench for most smaller bolts, and a 1/2" drive for larger ones on the 3.2L engine. Digital torque wrenches offer increased accuracy but ensure they are properly calibrated. Regularly check the calibration of your torque wrench per manufacturer's recommendations to ensure accuracy.

Q5

Are there any specific torque sequences for the 3.2L engine?

Yes, many components, like the cylinder head and intake manifold, require a specific torque sequence to ensure even clamping pressure and prevent warping. Refer to the repair manual for the precise pattern, which is often a spiral pattern from the center outwards. Skipping this step can cause gasket leaks and poor engine performance.

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

Torque Wrench (1/2 inch drive)

A calibrated torque wrench is essential for applying precise torque values to fasteners.

  • Measures torque in Newton-meters (Nm)
  • Click-type or digital readout
  • Range suitable for engine component torque specifications (e.g. 20-200 Nm)
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for lower torque values found in smaller engine components.

  • Measures torque in Newton-meters (Nm)
  • Click-type or digital readout
  • Range suitable for smaller fasteners (e.g. 5-50 Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various bolt and nut sizes on the 3.2L engine.

  • Includes common sizes like 10mm, 13mm, 16mm, 18mm, etc.
  • 3/8 and 1/2 inch drive options
  • 6-point sockets for better grip
Learn more

Extension Bars

Extension bars of various lengths to reach recessed fasteners.

  • 3/8 and 1/2 inch drive compatible
  • Various lengths (e.g., 3 inch, 6 inch)
  • Made from high-strength steel
Learn more

Universal Joint

A universal joint helps access fasteners at an angle.

  • 3/8 and 1/2 inch drive options
  • Durable construction
  • Provides flexible movement
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for properly torquing the cylinder head bolts on the 3.2L engine. Includes correct tightening sequence and angles.

  • Clean all bolt holes and threads thoroughly.
  • Install new cylinder head bolts, lightly lubricated.
  • Torque all bolts in sequence to first stage (e.g. 40 Nm).
  • Torque all bolts in sequence to second stage (e.g. 70 Nm).
  • Perform final angle tightening in sequence (e.g. 90 degrees + 90 degrees)
View full procedure

Intake Manifold Bolt Torque Procedure

Steps for tightening the intake manifold bolts to the correct torque values. Includes recommended sequence.

  • Clean intake manifold mating surfaces.
  • Place the intake manifold onto the cylinder head.
  • Install all bolts hand-tight.
  • Torque the bolts in a specific sequence to (e.g. 15 Nm).
  • Recheck all bolt torque after tightening.
View full procedure

Camshaft Bearing Cap Bolt Torque Procedure

Procedure for tightening the camshaft bearing cap bolts to the proper spec.

  • Ensure camshaft bearing caps are properly positioned.
  • Install the bolts hand-tight.
  • Tighten the bolts in the correct sequence to (e.g. 10 Nm) + specified angle (e.g. 90 degrees).
  • Verify final torques.
View full procedure

Timing Cover Bolt Torque Procedure

Steps for properly tightening all timing cover bolts. Note the differences between sizes.

  • Clean timing cover mating surface and install a new gasket.
  • Place timing cover onto the engine block.
  • Install all bolts hand tight.
  • Torque the specified larger bolts in sequence to (e.g. 25 Nm).
  • Torque smaller bolts in sequence to (e.g. 10 Nm).
View full procedure
Technical Service Bulletins

Oil Leak from Upper Timing Cover

2014-07-15

Some 2007-2011 3.2L V6 engines may exhibit oil leaks from the upper timing cover. This bulletin details the improved gasket and bolt torque procedure.

2007-2011 Audi A5 3.2L

Resolution: Replace upper timing cover gasket with updated part, apply anaerobic sealant to specific points, and torque all bolts to 25 Nm and smaller to 10 Nm.

Cylinder Head Bolt Stretching

2015-03-20

A bulletin was issued regarding improper torque procedure leading to stretched cylinder head bolts on some 3.2L engines. It outlines the updated torque sequence and the mandatory use of NEW bolts.

2007-2016 Audi A5 3.2L

Resolution: Always replace cylinder head bolts when removed, torque bolts in the following sequence, and follow the angle tightening procedure to prevent bolt stretching. 40 Nm, 70 Nm, then 90 degrees + 90 degrees.

Intake Manifold Air Leak Issue

2013-11-01

This bulletin addresses potential air leaks from the intake manifold on some 3.2L engines. This can be caused by uneven tightening or insufficient torque of the manifold bolts.

2007-2013 Audi A5 3.2L

Resolution: Ensure all manifold bolt holes are free of debris, hand tighten all fasteners and torque to spec 15 Nm following the specified sequence. Replace the intake manifold gasket if any signs of damage are present.

About the Author

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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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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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