Audi Audi S5 2017-present 3.0L Engine Bolt Torque Specifications & Fastener Values
Audi Audi S5 2017-present

Audi Audi S5 2017-present 3.0L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 3.0L TFSI engine found in the 2017 to present Audi S5 B9. Includes torque values for various 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

Engine Top End

This section covers torque specifications for components located on the upper portion of the engine, including cylinder head, valve train, and intake system components.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Always use new cylinder head bolts as they are torque-to-yield. Follow the specific tightening sequence for your engine model. Values are estimated based on similar 3.0L engine applications and typical M10 bolt sizing. Verify exact specifications before use.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly to ensure proper camshaft alignment. Check for any binding or excessive play after installation.
3

Camshaft Adjuster Bolts (Central)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the camshaft adjuster is properly positioned before tightening. Value is estimated based on similar 3.0L applications and typical M8 bolt sizing.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly to ensure a uniform seal. Check for oil leaks after installation.
5

Intake Manifold Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly to ensure proper seal and prevent vacuum leaks.

Engine Bottom End

This section covers torque specifications for components located in the lower portion of the engine, including main bearings, connecting rods, oil pan, and crankshaft components.

1

Main Bearing Cap Bolts

M10 x 1.5
Important Notes
Always use new main bearing cap bolts as they are torque-to-yield. Follow the specific tightening sequence for your engine model. Values are estimated based on similar 3.0L engine applications and typical M10 bolt sizing. Verify exact specifications before use.
2

Connecting Rod Bolts

M9 x 1.25
Important Notes
Always use new connecting rod bolts as they are torque-to-yield. Follow the specific tightening sequence. Values are estimated based on similar 3.0L engine applications and typical M9 bolt sizing. Verify exact specifications before use.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly in a cross pattern to ensure proper seal and prevent oil leaks. Ensure the oil pan gasket is correctly positioned.
4

Oil Pump Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the oil pump is correctly aligned before tightening these bolts.
5

Crankshaft Pulley Bolt (Central Bolt)

M18 x 2.0
Important Notes
Always use a new crankshaft pulley bolt as it is a torque-to-yield fastener. Ensure the pulley is properly aligned. Verify the correct procedure in the service manual for your specific engine.

Timing System

This section covers torque specifications for components related to the engine's timing system, including chain tensioners, guides, and camshaft sprockets.

1

Timing Chain Tensioner Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the tensioner is correctly positioned and functioning before tightening. Do not over-tighten these bolts.
2

Timing Chain Guide Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the guides are properly aligned before tightening. Check the guides for proper contact with the timing chain.
3

Camshaft Sprocket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the camshaft sprockets are correctly aligned with the timing marks. Verify correct tension on the timing chain prior to starting the engine.

Cooling System

This section covers torque specifications for components of the engine's cooling system, including water pump and thermostat housing.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten these bolts evenly to ensure proper seal of the water pump. Check for leaks after installation.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the thermostat housing gasket is properly positioned to prevent coolant leaks. Tighten these bolts evenly.

Exhaust System

This section covers torque specifications for exhaust-related components, including exhaust manifolds, downpipes, and clamps.

1

Exhaust Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten these bolts evenly to ensure a leak-free seal. Start at the center and work outward.
2

Exhaust Downpipe Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Ensure the exhaust flange is properly aligned before tightening these bolts. Check for exhaust leaks after installation.
3

Exhaust Clamp Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the exhaust clamp is properly positioned for a secure seal. Do not over-tighten.

Ancillary Components

This section covers torque specifications for ancillary components attached to the engine, including starter, alternator, and A/C compressor.

1

Starter Motor Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the starter is correctly positioned before tightening these bolts.
2

Alternator Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the alternator is properly aligned before tightening these bolts.
3

A/C Compressor Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the A/C compressor is correctly aligned before tightening these bolts.

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 proper torque specifications important for the 3.0L engine?

Correct torque ensures proper clamping force on components, preventing leaks, failures, and damage to threads. Under-torquing can lead to loosening and leaks, while over-torquing can strip threads, warp components, or cause bolt failure. For example, improperly torqued cylinder head bolts can lead to head gasket failure and coolant leaks.

Q2

What happens if I don't have a torque wrench?

While a torque wrench is highly recommended, you can get by in a pinch by using the 'feel' method. For example, for a smaller bolt, you might hand-tighten it then give it an additional 1/4 to 1/2 of a turn. However, this is not recommended as it doesn't provide accurate torque and risks over or under-torquing. Using a torque wrench provides accurate tightening to specific manufacturer specs. It's always best to acquire a reliable torque wrench for critical engine work.

Q3

Do I need to replace bolts when working on the 3.0L engine?

Some bolts, especially those subjected to high stress (like cylinder head bolts or connecting rod bolts), are designed for one-time use. These are called Torque-to-Yield (TTY) bolts and must be replaced after being removed. Consult your repair manual to identify these bolts. Reusing them can lead to fastener failure, potentially causing severe engine damage. For example, cylinder head bolts are typically TTY and must be replaced to ensure proper sealing.

Q4

Should I use threadlocker on engine bolts?

Threadlocker usage depends on the specific bolt and application, and the manufacturer specifications. Generally, some bolts benefit from threadlocker to prevent loosening due to vibration, heat, and thermal cycling. Check the service manual for instructions. Using threadlocker where it isn't specified can make future removal more difficult, while omitting it where it *is* specified can lead to failures. For instance, bolts used in exhaust manifold installation might require threadlocker.

Q5

How do I find the correct torque specs for a particular bolt on the 3.0L engine?

The most reliable source for torque specifications is the official Audi service manual for your specific year and model. These manuals often provide detailed torque specs for each bolt and assembly. You can also find specs in reputable aftermarket service manuals or automotive databases. Always verify the information from multiple sources to ensure accuracy. For instance, a cam carrier bolt will have a different torque spec than an oil pan bolt.

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 calibrated torque wrench is essential for accurate tightening of bolts to specified values.

  • Range of 20-200 Nm
  • Click-type for audible indication
Learn more

Torque Wrench (3/8" drive)

A smaller torque wrench is useful for bolts with lower torque specifications

  • Range of 5-50 Nm
  • Click-type for audible indication
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt head sizes.

  • Variety of sizes (8mm - 24mm)
  • 6-point design for better grip
Learn more

Socket Extensions

Extensions of various lengths to reach recessed bolts.

  • 3 inch
  • 6 inch
  • 10 inch
Learn more

Universal Joint

A universal joint is helpful to get access to bolts at an angle.

  • 1/2 inch drive
  • 3/8 inch drive
Learn more

Engine Bolt Torque Specifications Chart

Reference chart showing torque values for the 3.0L engine

  • PDF format
  • Easily readable
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Procedure for torquing cylinder head bolts on the 3.0L engine.

  • Clean all bolt threads and mating surfaces.
  • Apply a light coat of engine oil to bolt threads and under the bolt heads.
  • Install all cylinder head bolts and hand tighten.
  • Torque all bolts to 40 Nm in the sequence provided in the service manual.
  • Torque all bolts to an additional 90 degree turn using an angle gauge.
  • Torque all bolts to an additional 90 degree turn using an angle gauge.
View full procedure

Intake Manifold Bolt Torque Procedure

Procedure for torquing intake manifold bolts on the 3.0L engine.

  • Install intake manifold bolts and hand tighten
  • Torque all bolts to 10 Nm in the sequence provided in the service manual.
  • Torque all bolts to 20 Nm in the sequence provided in the service manual.
View full procedure

Oil Pan Bolt Torque Procedure

Procedure for torquing oil pan bolts on the 3.0L engine.

  • Install oil pan bolts and hand tighten.
  • Torque all bolts to 10 Nm in the sequence provided in the service manual.
View full procedure

Timing Cover Bolt Torque Procedure

Procedure for torquing timing cover bolts on the 3.0L engine.

  • Install timing cover bolts and hand tighten
  • Torque all bolts to 10 Nm in the sequence provided in the service manual.
View full procedure
Technical Service Bulletins

Engine Oil Leak From Cylinder Head Bolts

2020-03-15

Some 3.0L engines may experience oil leaks from the cylinder head bolt area. This may be due to insufficient torque on initial assembly. Check for proper torque application.

2017-2019

Resolution: Inspect the cylinder head bolts for correct torque. Refer to the torque procedure in the service manual to ensure correct torque application.

Timing Cover Bolt Breakage

2021-06-20

Some 3.0L engines may experience broken timing cover bolts due to overtightening or bolt fatigue. Always verify torque specifications before installation.

2018-2020

Resolution: Inspect the bolts for signs of fatigue. Follow proper torque application when replacing them. Use new bolts if there are signs of damage.

Intake Manifold Leaks

2022-11-10

Some 3.0L engines have been reported to have intake manifold leaks around mating surfaces. Check bolt torque and inspect for a damaged gasket.

2017-2022

Resolution: Ensure proper torque of the intake manifold bolts. Replace the intake manifold gasket if necessary.

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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