Audi Audi S4 2016-present 3.0L Engine Bolt Torque Specifications & Fastener Values
Audi Audi S4 2016-present

Audi Audi S4 2016-present 3.0L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts used in the 3.0L engine of the 2016-present Audi S4 (B9 generation). Includes critical torque values for engine components.

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

Cylinder Head

Specifications for securing the cylinder head and its associated components. Proper torque is critical for maintaining combustion chamber sealing and proper valvetrain operation.

1

Cylinder Head Bolts

M10 x 1.5
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
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 Value
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

Specifications for critical fasteners within the engine block structure. Precise torquing is essential for proper bearing clearances and crankshaft/connecting rod integrity.

1

Main Bearing Cap Bolts

M12 x 1.5
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
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 Value
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 Value
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

Specifications for manifold and exhaust component fasteners. Proper torque is crucial for preventing leaks and maintaining system performance.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
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 Value
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 Value
30 ft-lbs (40 N·m)
Important Notes
Secures the downpipe to the turbocharger flange. Prevents exhaust leaks.

Cooling System

Specifications for water pump and thermostat housing fasteners. Proper torque prevents coolant leaks and ensures system functionality.

1

Water Pump Bolts

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

Timing System

Specifications for timing chain components. Proper torque ensures correct timing and engine operation.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
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 Value
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
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

Specifications for mounting bolts of various engine accessories. Proper torque is important for secure mounting and preventing vibrations.

1

Alternator Mounting Bolts

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

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 is it crucial to use the correct torque specifications?

Using incorrect torque specifications can lead to serious issues. Under-torquing may result in bolts loosening over time, leading to leaks or component failure. Over-torquing can damage threads, stretch bolts beyond their yield point, and even crack engine components, potentially causing catastrophic engine failure. Proper torque ensures the joint is properly clamped and maintains its integrity under stress and thermal expansion.

Q2

Do torque specifications vary between different bolt materials?

Yes, torque specifications can vary greatly depending on the bolt material, size, and thread pitch. For example, aluminum bolts often require lower torque values compared to steel bolts of the same size. Always refer to the manufacturer's specifications for the specific bolt you are using. Using generic torque values can be disastrous.

Q3

Should I use new bolts every time I disassemble and reassemble engine components?

In many cases, especially for critical engine components like cylinder head bolts or connecting rod bolts, it's highly recommended to use new bolts each time. These bolts are often designed to stretch slightly when torqued, and reusing them can lead to improper clamping force and potential failure. Consult the Audi repair manual for specific recommendations on reusing bolts.

Q4

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

A calibrated click-type torque wrench is recommended for most engine work. This type of wrench will provide an audible and tactile signal when the desired torque is reached, preventing over-tightening. Beam-type torque wrenches can also be used, but they require careful monitoring of the needle to reach the correct value. Ensure your torque wrench is within its calibration range for accurate measurements. Digital torque wrenches are the most precise but can be expensive.

Q5

What is the 'torque to yield' method and does it apply to the 3.0L engine?

Some bolts are designed to 'torque to yield' (TTY). This method involves tightening the bolt to a certain torque value and then turning it an additional number of degrees. This stretches the bolt to a specific point in its plastic deformation range, creating a very precise clamping force. Some bolts on the 3.0L engine might utilize TTY, so consult the repair manual. These bolts are always single-use and MUST be replaced every time they are removed.

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" Drive)

A high-quality torque wrench with a range that covers the specified torque values for engine components.

  • Accurate torque application
  • Audible click or digital display for confirmation
Learn more

Torque Wrench (3/8" Drive)

A torque wrench for lower torque value applications.

  • Accurate low torque settings
  • Smaller profile for tight areas
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes, including standard and deep well.

  • Covers all required bolt sizes
  • Durable construction for repeated use
Learn more

Socket Extensions and Universal Joint

Various socket extensions and a universal joint to reach bolts in awkward locations.

  • Allows access to difficult to reach bolts
  • Variety of sizes and lengths
Learn more

Thread Locker (Medium Strength)

Medium strength thread locker compound for critical bolts

  • Prevents bolts from loosening under vibration
  • Easy application
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Detailed steps for correctly tightening the cylinder head bolts on the 3.0L engine.

  • Apply new cylinder head bolts.
  • Stage 1: Torque all bolts in sequence to 40 Nm
  • Stage 2: Torque all bolts in sequence to 60 Nm
  • Stage 3: Rotate all bolts in sequence an additional 90 degrees.
  • Stage 4: Rotate all bolts in sequence an additional 90 degrees.
View full procedure

Intake Manifold Bolt Tightening Procedure

Steps for torquing down the intake manifold bolts.

  • Place intake manifold onto the cylinder head, ensuring proper gasket placement.
  • Hand-tighten bolts to ensure even pressure.
  • Torque bolts in specified sequence to 10 Nm.
View full procedure

Camshaft Bearing Cap Bolt Tightening Procedure

Steps for tightening camshaft bearing cap bolts correctly

  • Ensure the camshaft bearing caps are correctly oriented.
  • Torque the bolts in sequence to 10 Nm.
  • Torque the bolts an additional 90 degrees
View full procedure

Oil Pan Bolt Tightening Procedure

Steps for torquing the oil pan bolts.

  • Install new oil pan gasket.
  • Place the oil pan onto the engine.
  • Hand-tighten the bolts to ensure proper seal and even pressure.
  • Torque all bolts to 25 Nm
View full procedure
Technical Service Bulletins

Oil Leak from Upper Timing Cover

2018-05-15

Reports of oil leaks from the upper timing cover on 3.0L engines.

2016-2018 Audi S4 and similar vehicles

Resolution: Replace the upper timing cover seal and bolts, ensuring proper torque specification and thread locker application

Cylinder Head Bolt Stretch Issue

2020-11-20

Reports of cylinder head bolt stretch causing head gasket failure on certain 3.0L engines

2018-2020 Audi S4 and similar vehicles

Resolution: Use new updated cylinder head bolts with the latest torque specifications, and replace the cylinder head gasket.

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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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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