Audi Audi RS4 2005-2008 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 Drivetrain Bolt Torque Specifications

Comprehensive list of torque specifications for all drivetrain bolts on the 2005-2008 Audi RS4 (B7 generation). Includes front differential, rear differential, center differential, driveshaft, axles, and related 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

Transmission

Torque specifications for the 6-speed manual transmission, including case, mounting, clutch, and linkage components.

1

Transmission Case Bolts (Large)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry standard for M10 case bolts. These bolts secure the transmission case halves and maintain oil sealing.
2

Transmission Case Bolts (Small)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standard for M8 case bolts. These bolts secure the transmission case halves and maintain oil sealing.
3

Transmission to Engine Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated based on industry standard for M12 transmission mounting bolts. These are highly critical bolts. Ensure proper alignment during installation.
4

Transmission Mount Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry standard for M10 transmission mount bolts. Proper torque is critical for preventing excessive movement and vibration.
5

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standard for M8 pressure plate bolts. Use a star pattern sequence to ensure even clamping pressure.
6

Flywheel Bolts

M12 x 1.5
Important Notes
Derived from similar Audi models. These are typically one-time use bolts. Always use new bolts. Proper torque and sequence are crucial for preventing imbalance and vibration.
7

Shifter Linkage Bolts

M6 x 1.0 - M8 x 1.25
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated based on size and industry standard. Verify each specific bolt with size. Use appropriate torque within the given range per specific size.

Front Differential

Torque specifications for the front differential components, including case, mounting, and ring gear.

1

Differential Case Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry standard for M10 case bolts. Secures the front differential case halves. Proper torque is essential for maintaining gear alignment and oil sealing.
2

Differential Mounting Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated based on industry standard for M12 differential mounting bolts. Secures the differential to the vehicle chassis.
3

Ring Gear Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated based on similar Audi models. Attach the ring gear to the differential carrier. Use a star pattern sequence to ensure even clamping.
4

Output Flange Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on similar Audi models. Secure the drive shafts to the differential. Ensure even torque to prevent vibrations.

Rear Differential

Torque specifications for the rear differential components, including case, mounting, and ring gear.

1

Differential Case Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry standard for M10 case bolts. Secures the rear differential case halves.
2

Differential Mounting Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated based on industry standard for M12 differential mounting bolts. Secures the differential to the subframe and chassis.
3

Ring Gear Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated based on similar Audi models. Attaches the ring gear to the differential carrier. Use a star pattern sequence to ensure even clamping.
4

Output Flange Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on similar Audi models. Secure the drive shafts to the differential. Ensure even torque.
5

Rear Differential Cover Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standard for M8 case bolts. Secures the rear differential cover and maintains the proper oil seal.

Driveshaft

Torque specifications for driveshaft components, including center support bearings, flange bolts, and flexible disc bolts.

1

Driveshaft Center Support Bearing Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry standard for M10 driveshaft support bolts. Secures the driveshaft center support bearing to the chassis.
2

Driveshaft Flange Bolts (Front/Rear)

M8 x 1.25 or M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on similar Audi models and driveshaft flange sizes. Always use new bolts on high performance applications. Torque M8 bolts to 18 ft-lbs (25 N·m), M10 bolts to 30 ft-lbs (40 N·m).
3

Flexible Disc Bolts (Guibo)

M10 x 1.5
Important Notes
Derived from similar Audi models. These bolts connect the driveshaft to the transmission and differential using a flexible disc. Proper torque is critical to prevent vibrations.

Axles Cv Joints

Torque specifications for axle and CV joint components, including axle shaft to hub bolts and inner/outer CV joint bolts.

1

Axle Shaft to Hub Bolt

M14 x 1.5 or M16 x 1.5
Important Notes
Estimated based on similar Audi models and industry-standard axle bolt specifications. Extremely important for safety. These bolts are typically one-time use. Always refer to the specific torque + degree sequence on replacement bolt package. Always use new bolts.
2

Inner CV Joint Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standard for M8 CV joint bolts. Secures the inner CV joint to the differential or intermediate shaft. Always use new bolts.
3

Outer CV Joint Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated based on industry standard for M8 CV joint bolts. Secures the outer CV joint to the wheel hub/axle. Always use new 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 is using the correct torque specification important for drivetrain bolts?

Using the correct torque specification is crucial to ensure proper clamping force. Under-tightening can lead to components loosening, potentially causing damage or failure. Over-tightening can stress the bolt, leading to thread stripping or component damage. Both scenarios can result in drivetrain malfunction and unsafe operating conditions. Think of it like the Goldilocks principle: you need the torque to be 'just right'.

Q2

What happens if I over-torque a driveshaft bolt?

Over-torquing a driveshaft bolt can lead to several issues. It can stretch or damage the bolt, potentially leading to future failure. It can also damage the threads in the receiving component (like the differential flange or wheel hub), making it difficult or impossible to properly secure the bolt next time. In a worst-case scenario, an over-torqued bolt could snap under stress, causing driveshaft detachment and potential loss of control.

Q3

Can I reuse driveshaft bolts?

Generally, it's recommended to replace drivetrain bolts, especially driveshaft bolts, as they are often 'torque-to-yield' bolts, designed to stretch slightly upon tightening. Reusing them risks under-clamping due to the initial stretch. Always refer to the vehicle's service manual for specific instructions. For critical components like the driveshaft, using new bolts and following the specified torque is a wise practice.

Q4

What tools do I need to accurately torque drivetrain bolts?

You'll need a calibrated torque wrench, the correct size sockets, and potentially extensions to reach recessed bolts. It’s best to use a high quality torque wrench, and check its calibration regularly. You may also need a breaker bar to break seized bolts loose, but never use this to tighten. Always refer to the vehicle's service manual for specific torque values and tightening sequences. Also, consider using a service manual to verify what type of bolt is used, as some fasteners require an initial torque value, and a further angle-degree tightening.

Q5

Should I use threadlocker on drivetrain bolts?

The use of threadlocker varies by application. For many drivetrain components, especially those subject to vibration, a medium-strength (Blue) threadlocker is often recommended to prevent loosening, but some bolts may be specified to be installed without. Always refer to the vehicle's service manual. Improper use of threadlocker can lead to issues with future removal, so it's imperative to use it as prescribed by the service manual.

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 achieving accurate bolt tightening. A 1/2 inch drive is recommended for the torque ranges required on the RS4 drivetrain.

  • Calibrated for accuracy
  • Wide torque range (typically 20-200 Nm or greater)
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench, often 3/8 inch drive, is needed for some lower torque bolts within the drivetrain assembly.

  • Calibrated for accuracy
  • Lower torque range (typically 5-60 Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets (both standard and deep) is required for accessing various bolts and nuts in the drivetrain.

  • Variety of metric sizes (8mm to 24mm or larger)
  • Both standard and deep sockets
Learn more

Extension Bars (Various lengths)

Extension bars of various lengths are essential for reaching recessed bolts or nuts in the drivetrain components.

  • Various lengths (3-inch, 6-inch, 10-inch)
  • Compatible with drive sizes
Learn more

Universal Joint Adapter

A universal joint adapter helps to access bolts that are at an awkward angle.

  • Allows socket to pivot
  • Available in various drive sizes
Learn more
Service Procedures

Front Axle Driveshaft Bolt Torque

Procedure for correctly torquing the bolts connecting the front driveshafts to the wheel hubs and transmission flanges.

  • Clean threads of bolts and hub/flange holes.
  • Install driveshaft and insert bolts by hand
  • Tighten all bolts in a star pattern to a preliminary torque setting. (Typically 40Nm)
  • Tighten bolts to final torque spec. (Typically 70Nm + 90 degrees)
View full procedure

Rear Differential Mounting Bolt Torque

Procedure for correctly torquing the bolts that secure the rear differential to the subframe.

  • Clean threads of all bolts and the mounting points
  • Install differential and insert mounting bolts by hand
  • Tighten bolts in a criss-cross pattern to an initial torque setting. (Typically 25Nm)
  • Tighten bolts to final torque spec. (Typically 60Nm + 90 degrees)
View full procedure

Driveshaft Center Support Bearing Bolt Torque

Procedure for correctly torquing the bolts holding the center support bearing to the body.

  • Clean all mating surfaces.
  • Install driveshaft and support bearing.
  • Insert bolts by hand.
  • Tighten bolts to final torque spec (Typically 25Nm)
View full procedure

Transmission Mounting Bolt Torque

Procedure for correctly torquing the bolts that secure the transmission to the engine and chassis.

  • Clean all mating surfaces.
  • Install the transmission and loosely install bolts.
  • Tighten bolts in a star pattern to an initial torque. (Typically 30Nm)
  • Tighten bolts to final torque spec. (Typically 60Nm + 90 degrees)
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2007-06-15

Some RS4 models experienced issues with driveshaft bolts loosening after normal use. This bulletin outlines the cause and repair procedure.

2005-2007

Resolution: Replace driveshaft bolts with updated part number and torque to specific sequence and torque specifications. Apply thread locker (Loctite 2701) to threads.

Rear Differential Noise Due to Improper Torque

2006-04-20

Reports of abnormal noise from the rear differential were traced to improper torquing of the mounting bolts during assembly or repair. This bulletin clarifies the procedure

2005-2008

Resolution: Inspect the rear differential mount bolts and re-torque to specified sequence and torque specifications. Replace bolts if any signs of damage or stretch are apparent.

About the Author

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Alan Montanye - Automotive Technical Specialist
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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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