Audi Audi RS4 2000-2001 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2000-2001

Audi Audi RS4 2000-2001 Drivetrain Bolt Torque Specifications

Comprehensive guide to the drivetrain bolt torque specifications for the 2000-2001 Audi RS4 (B5) model, including transmission, differential, and driveshaft 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 components. These values ensure proper sealing, alignment, and secure mounting of the transmission to the vehicle and its components.

1

Transmission Housing Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on industry standards for M10 fasteners in aluminum housings. Secures the transmission housing halves.
2

Transmission Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar Audi manual transmissions. Connects transmission to the chassis/subframe.
3

Output Flange Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standards for M8 fasteners. Connects output flange to the transmission.
4

Clutch Housing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on industry standards for M8 fasteners in similar applications. Secures clutch housing to engine.
5

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar clutch applications. Use a star pattern sequence. Ensure bolts are tightened evenly for proper clutch operation.

Driveshaft

Torque specifications for various driveshaft components, including CV joint bolts, support bearing bolts, and flex disc bolts. Proper torquing is vital for vibration-free and reliable power transfer.

1

Front Driveshaft CV Joint Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standard for M8 fasteners. Attaches the CV joints to the transmission and front differential output flanges.
2

Rear Driveshaft CV Joint Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standard for M8 fasteners. Attaches the rear CV joints to the rear differential and center driveshaft.
3

Center Driveshaft Support Bearing Bolts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Estimated value, based on similar applications and bolt sizes. Holds the center driveshaft support bearing to the chassis. Adjust torque based on if M8 or M10 is used.
4

Driveshaft Flex Disc Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value from similar Audi applications. Connects the driveshaft to the transmission/differential using flexible couplings.

Front Differential

Torque specifications for the front differential components. Proper torque ensures housing integrity and secure mounting to the vehicle.

1

Front Differential Housing Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on industry standard for M10 fasteners in similar housings. Secures the front differential housing.
2

Front Differential Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value from similar Audi applications. Attaches the front differential to the subframe.
3

Front Output Flange Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standards for M8 fasteners. Connects the output flange of the front diff to CV shafts.

Rear Differential

Torque specifications for the rear differential components. Proper torque ensures housing integrity and secure mounting to the vehicle.

1

Rear Differential Housing Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on industry standard for M10 fasteners in similar housings. Secures the rear differential housing.
2

Rear Differential Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value from similar Audi applications. Attaches the rear differential to the subframe.
3

Rear Output Flange Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standard for M8 fasteners. Connects the output flange of the rear diff to CV shafts.

Axles Cv Joints

Torque specifications for axle and CV joint components, ensuring reliable power transfer to the wheels. Proper torque is crucial for joint integrity and vehicle safety.

1

Inner CV Joint Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standard for M8 fasteners. Attaches the CV joints to the drive flanges on the differential.
2

Outer CV Joint Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standard for M8 fasteners. Attaches the outer CV joints to the wheel hub assembly.
3

Wheel Hub Nut (Front and Rear)

M22 x 1.5
Important Notes
Estimated value. This is a torque-to-yield or stretch bolt. Always replace with a NEW nut. Verify with official manual. Secures the wheel hub to the axle.

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 the correct torque specifications?

Using the correct torque specifications for drivetrain bolts is crucial for several reasons. Under-tightening can lead to bolts loosening over time, causing component failure and potentially dangerous situations. Over-tightening can stretch or damage the bolts, leading to premature failure, and potentially damaging the components they are securing, such as the gearbox or differential casings. Correct torque ensures a proper clamping force, preventing movement, leaks, and maintaining the integrity of the drivetrain.

Q2

What tools are needed to properly torque drivetrain bolts?

You will need a calibrated torque wrench that covers the required torque ranges specified for your RS4's drivetrain components. You will also need the correct size sockets, and possibly extensions or universal joints to access all bolts. For instance, you might need a 12-point socket for driveshaft bolts and an impact socket for axle nuts. Always use a good quality, properly maintained torque wrench.

Q3

Are there any specific procedures for tightening drivetrain bolts?

Yes, often drivetrain bolts must be tightened in a specific sequence or pattern. For example, differential cover bolts usually require a cross-tightening method, tightening them a little at a time in a star pattern to distribute the pressure evenly and prevent warping or leaks. Consult the service manual for the correct tightening sequence for your specific application. Also, some bolts may require thread locker. Apply thread locker to bolts as directed by the manual. Do not apply thread locker to bolts that require a specific torque angle (torque-to-yield). Also many drivetrain bolts are single use and should not be re-used.

Q4

What happens if I don't have access to the specific torque specs?

If you cannot find the exact torque specifications for your 2000-2001 Audi RS4 drivetrain bolts, do not guess. Consult a reliable service manual specific to your vehicle or seek advice from a qualified Audi mechanic. Incorrect torque can result in serious damage and safety issues. Remember, proper torque is critical for reliable performance and safe operation of your vehicle.

Q5

Should I re-torque drivetrain bolts after a service?

Some drivetrain components, such as drive shafts and suspension bolts, may benefit from a re-torque after a short period of driving (usually 50-100 miles) after installation. This allows the components to settle. Always consult your service manual for specific guidelines regarding re-torquing.

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 with a 1/2" drive is essential for accurately tightening drivetrain bolts to the specified torque values. Ensure it covers the required torque ranges.

  • Accurate torque application
  • Wide torque range (typically 20-150 ft-lbs)
  • 1/2" drive for common bolt sizes
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for smaller bolts in the drivetrain assembly.

  • Accurate torque application
  • Smaller torque range (typically 5-80 ft-lbs)
  • 3/8" drive for smaller fasteners
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt and nut sizes found in the drivetrain.

  • Variety of metric sizes
  • Durable construction
  • Deep and shallow sockets
Learn more

Socket Extensions and Universal Joint

Extensions and a universal joint may be necessary to access bolts in difficult locations within the drivetrain assembly.

  • Allows access to recessed bolts
  • Provides flexibility in tight spaces
  • Durable construction
Learn more

Service Manual (Audi RS4)

The official Audi service manual provides detailed torque specifications and diagrams specific to the RS4 drivetrain.

  • Detailed torque specs
  • Exploded views
  • Specific procedures for RS4
Learn more
Service Procedures

Front Axle Bolt Torque Procedure

This procedure outlines the correct steps for tightening the various bolts related to the front axle assembly on the 2000-2001 Audi RS4. This includes control arm bolts, strut bolts, and axle nuts.

  • Identify specific bolts that need to be torqued, according to your service manual
  • Clean threads of all bolts and mating surfaces
  • Begin by hand-tightening all bolts. Do not fully tighten them before all are in place.
  • Use the torque wrench to tighten bolts in a star pattern to the specified torque. Use appropriate extensions when required to avoid incorrect torque readings.
  • Double-check torque specifications against the service manual.
  • Recheck torque after a short test drive.
View full procedure

Rear Axle Bolt Torque Procedure

This procedure details the torque specifications for the rear axle components, including control arms, hub carrier bolts, and axle nuts.

  • Identify specific bolts that need to be torqued, according to your service manual
  • Clean threads of all bolts and mating surfaces
  • Begin by hand-tightening all bolts. Do not fully tighten them before all are in place.
  • Using a torque wrench, tighten bolts to the specified values in a cross-pattern to ensure even loading. Use appropriate extensions when required to avoid incorrect torque readings.
  • Reconfirm torque values against the service manual.
  • Perform a visual inspection of all bolts after torquing.
  • Recheck torque after a short test drive.
View full procedure

Driveshaft Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the driveshaft bolts and hardware.

  • Identify specific bolts that need to be torqued, according to your service manual
  • Clean threads of all bolts and mating surfaces
  • Begin by hand-tightening all bolts. Do not fully tighten them before all are in place.
  • Tighten the driveshaft bolts to the specified torque using a calibrated torque wrench. Use a star pattern for even clamping. Use appropriate extensions when required to avoid incorrect torque readings.
  • Recheck all bolts to verify they are torqued to specification.
  • Perform a visual inspection for any signs of damaged or improperly installed bolts
  • Recheck torque after a short test drive.
View full procedure

Differential Mounting Bolt Torque Procedure

This procedure details the correct torquing process for the differential mounting bolts.

  • Identify specific bolts that need to be torqued, according to your service manual
  • Clean threads of all bolts and mating surfaces
  • Begin by hand-tightening all bolts. Do not fully tighten them before all are in place.
  • Using a calibrated torque wrench, tighten the differential mounting bolts in a cross pattern to the specified values. Use appropriate extensions when required to avoid incorrect torque readings.
  • Confirm all torque values match those in the service manual.
  • Recheck torque after a short test drive.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2003-05-15

Some 2000-2001 Audi RS4 models have experienced driveshaft bolt loosening over time. This bulletin addresses the issue and provides updated torque specifications and tightening procedures.

2000-2001 Audi RS4

Resolution: Replace driveshaft bolts with updated bolts. Apply specified threadlocker and torque to revised value. Regularly check torque values during routine maintenance.

Rear Differential Mount Noise

2002-11-01

Reports of rear differential mounting noises on early B5 RS4s have been received. This bulletin provides updated mounting bolt torque specifications and a modified installation procedure to address the issue.

2000-2001 Audi RS4

Resolution: Replace differential mounting hardware with updated bolts. Tighten mounting bolts to revised torque specifications. Inspect for damage to mounting bushings and replace as needed. Recheck for noises following installation and test drive.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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