Audi Audi S6 2018-present 2.9L Engine Bolt Torque Specifications & Fastener Values
Audi Audi S6 2018-present

Audi Audi S6 2018-present 2.9L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 2.9L V6 engine found in the 2018-Present Audi S6. Includes torque values for cylinder heads, main bearings, connecting rods, and other critical 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

Torque specifications for components located on the upper part of the engine, including intake, valve train, and fuel system.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper torque sequence is followed to prevent vacuum leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not over-tighten to avoid damage to the throttle body.
3

Valve Cover Bolts (Upper)

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque in a specific sequence for even gasket compression.
4

Valve Cover Bolts (Lower)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque in a specific sequence for even gasket compression. Value is estimated based on similar Audi models.
5

Camshaft Bearing Cap Bolts

M8 x 1.25
Important Notes
Follow proper torque sequence and angle procedure. Critical for camshaft alignment.
6

High-Pressure Fuel Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Do not over-tighten due to sensitive pump components. Estimated value.
7

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated before tightening.

Engine Block Bottom End

Torque specifications for components located in the lower part of the engine, including oil pan, connecting rods, and crankshaft.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque and gasket are essential for a leak-free seal. Follow specified sequence.
2

Oil Drain Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer each time to prevent oil leaks.
3

Connecting Rod Bolts

M9 x 1.0
Important Notes
Critically important. Follow torque sequence. Use a torque angle meter. Angle value is estimated.
4

Main Bearing Cap Bolts (Inner)

M12 x 1.5
Important Notes
Crucial for crankshaft support. Follow proper sequence. Use a torque angle meter. Angle value is estimated.
5

Main Bearing Cap Bolts (Outer)

M10 x 1.5
Important Notes
Crucial for crankshaft support. Follow proper sequence. Use a torque angle meter. Angle value is estimated.
6

Crankshaft Pulley Bolt

M18 x 1.5
Important Notes
Single use bolt - must be replaced. Proper torque is critical for timing accuracy. Angle value is estimated.
7

Flywheel/Flexplate Bolts

M10 x 1.25
Important Notes
Single use bolt - must be replaced. Torque sequence must be followed. Angle value is estimated.

Cooling System

Torque specifications for components related to the engine's cooling system.

1

Water Pump Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Proper torque is crucial for gasket seal and to prevent coolant leaks.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Proper torque ensures a leak-free seal.

Exhaust System

Torque specifications for components related to the engine's exhaust system.

1

Exhaust Manifold to Head Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new bolts and follow torque sequence to ensure leak-free seal.
2

Turbocharger Mounting Bolts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use high-temperature lubricant on threads. Torque to prevent leaks. Estimated Value.
3

Downpipe to Turbocharger Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use new bolts and a high temperature sealant. Estimated Value.
4

Exhaust System Hanger Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper support of the exhaust system. Industry Standard Value.

Lubrication System

Torque specifications for components related to the engine's lubrication system.

1

Oil Pump Mounting Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential for proper pump operation. Estimated Value.
2

Oil Filter Housing Bolts

M7 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Do not over-tighten as the housing can crack.

Timing System

Torque specifications for components related to the engine's timing system.

1

Timing Chain Tensioner Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Proper torque is critical for timing accuracy. Estimated Value.
2

Timing Chain Guide Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Essential for proper chain operation. Estimated Value.

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 important to use a torque wrench when tightening engine bolts?

Using a torque wrench ensures that bolts are tightened to the precise specification, preventing damage to the engine components due to over or under-tightening. Over-tightening can stretch or break bolts, damage threads, or deform parts, while under-tightening can lead to leaks and component failure. For example, improperly torqued cylinder head bolts can cause head gasket failure, resulting in coolant or oil leaks.

Q2

What happens if I over-torque a bolt?

Over-torquing a bolt on the 2.9L engine can cause several issues. It can stretch the bolt beyond its yield point, which can lead to weakening, cracking, or even snapping of the bolt. It can also damage the threads in the engine block or component being fastened, potentially requiring costly repairs. Example: Over-torquing the intake manifold bolts can crack the manifold or damage the cylinder head threads.

Q3

Should I lubricate engine bolts before torquing?

It depends on the specific bolt and manufacturer's recommendation. Some bolts, like those used with the cylinder head, require specific lubricants to achieve the correct torque. However, most bolts on the 2.9L engine should be tightened without lubricant unless explicitly stated in the repair manual. Always refer to the official repair manual for the Audi S6 with the 2.9L engine. If lubrication is required, using the wrong lubricant can dramatically alter torque values.

Q4

How often should I re-torque engine bolts?

Typically, most engine bolts, once torqued correctly using a quality torque wrench, do not require re-torquing unless specifically stated in the vehicle's service manual, or if the bolted assembly has been recently disturbed. Some exceptions include newly installed cylinder heads where the bolts might need a 're-torque' after heat cycling, but this will be specified in the factory repair procedure.

Q5

Where can I find the official torque specifications for my 2018+ Audi S6 2.9L engine?

The most reliable source for torque specifications is the official Audi repair manual or technical documentation for your specific model year and engine. These documents can be purchased from Audi dealerships or through online technical subscription services. Avoid using unofficial or unreliable online resources as torque specifications can vary and lead to incorrect installation procedures.

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 (1/4" Drive)

A calibrated torque wrench for applying precise torque settings on smaller fasteners.

  • Accurate torque measurements
  • Click-type mechanism for indication
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench for medium-sized fasteners commonly found on engine components.

  • Wider torque range than 1/4" drive
  • Durable construction
Learn more

Torque Wrench (1/2" Drive)

A calibrated torque wrench for larger fasteners requiring higher torque settings.

  • High torque capacity
  • Robust design
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit different bolt heads.

  • Variety of socket sizes
  • 6-point design for secure grip
Learn more

Socket Extensions

Extensions of various lengths to reach recessed or difficult-to-access bolts.

  • Different lengths
  • Secure connections
Learn more

Swivel Adapters

Allow for angled access to fasteners when a straight approach is not possible.

  • Multiple angle adjustments
  • Durable build
Learn more
Service Procedures

Intake Manifold Bolt Torque Procedure

Proper procedure for torquing the intake manifold bolts on the 2.9L engine.

  • Locate all intake manifold bolts.
  • Hand-tighten all bolts in a criss-cross pattern.
  • Torque bolts to 10 Nm in a criss-cross pattern.
  • Torque bolts to 20 Nm in a criss-cross pattern.
  • Check all bolts to ensure proper torque.
View full procedure

Cylinder Head Bolt Torque Procedure

Procedure for correctly torquing the cylinder head bolts. Requires new fasteners per repair manual.

  • Locate cylinder head bolts. Note position.
  • Install new cylinder head bolts per repair manual.
  • Torque all bolts in sequence to 40 Nm.
  • Torque all bolts in sequence to 90 degrees.
  • Torque all bolts in sequence to 90 degrees.
  • Check all bolts for proper torque.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Procedure for torquing the main bearing cap bolts.

  • Locate all main bearing cap bolts.
  • Hand-tighten all bolts.
  • Torque bolts in sequence to 30 Nm.
  • Torque bolts in sequence to 90 degrees.
  • Check all bolts for proper torque.
View full procedure
Technical Service Bulletins

Oil Leakage from Upper Timing Cover

2020-05-15

Reports of oil leakage at the upper timing cover. Possible cause is improper bolt torque. Verify torque on affected vehicles.

2018-2020

Resolution: Inspect the upper timing cover area for leaks, ensure all bolts are torqued to specification (10 Nm) and re-seal if necessary.

Camshaft Sensor Mounting Bolt Issue

2021-11-20

Loose camshaft sensor bolts reported. Check bolt torque and apply threadlocker if needed.

2019-2021

Resolution: Verify the torque of the camshaft sensor mounting bolts (8 Nm). Apply threadlocker and re-torque if required.

Turbocharger Oil Feed Line Connection Leak

2022-09-01

Oil leaks have been reported at the turbocharger oil feed line connection. Verify bolt torque at this connection and replace seals.

2020-2022

Resolution: Inspect turbo oil feed line and ensure torque spec (22Nm) at connecting bolts. Replace sealing washers as needed.

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