Audi Audi RS4 2000-2001 AL450 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi RS4 2000-2001

Audi Audi RS4 2000-2001 AL450 Transmission Torque Specifications

Comprehensive list of torque specifications for all bolts on the AL450 transmission found in the 2000-2001 Audi RS4 (B5) model. This includes case bolts, pan bolts, and other critical fasteners.

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 Housing

Bolts related to the main transmission housing and its attachment points. These are critical for structural integrity and fluid sealing.

1

Transmission Case Bolts (Main Housing)

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
These bolts secure the main transmission case halves. Use a criss-cross tightening pattern to ensure even clamping force. Estimated value based on similar applications.
2

Bellhousing Bolts (Engine to Transmission)

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
These bolts attach the transmission to the engine block. Use a criss-cross tightening pattern and new bolts if specified. Estimated value based on similar applications.
3

Rear Transmission Mount Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
These bolts attach the rear transmission mount to the transmission housing. Ensure the mount is properly aligned. Estimated value based on similar applications.
4

Transmission Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer to ensure a proper seal. Estimated value based on similar applications.
5

Transmission Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer to ensure a proper seal. Estimated value based on similar applications.

Internal Components

Torque specifications for components housed within the transmission case, including the valve body, oil pump and clutch packs.

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the valve body to the transmission housing. Use a criss-cross tightening pattern to prevent warping. Estimated value based on similar applications.
2

Oil Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the oil pump to the housing. Estimated value based on similar applications.
3

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the Mechatronic unit. Use a criss-cross tightening pattern to prevent damage. Estimated value based on similar applications.
4

Clutch Pack Retaining Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
These bolts retain the clutch packs. Estimated value based on similar clutch pack designs.
5

Differential Bearing Cap Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
These bolts secure the differential bearing caps. Tighten in sequence to ensure proper bearing preload. Estimated value based on similar applications.

External Components

Torque specifications for external components attached to the transmission, such as driveshafts and sensors.

1

Driveshaft Flange Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
These bolts connect the driveshaft to the transmission output flange. Use new bolts if specified. Apply Loctite where necessary. Estimated value based on similar applications.
2

Speed Sensor Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the speed sensors. Do not overtighten. Estimated value based on similar applications.
3

Transmission Cooler Line Fittings (Banjo Bolts)

M12 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers to ensure a proper seal. Estimated value based on similar applications.

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 accurate torque specifications important when working on the AL450 transmission?

Accurate torque specifications are crucial to ensure proper clamping force on transmission components. Under-torqued bolts can loosen over time, causing leaks, vibrations, or even component failure. Over-torquing can strip threads, damage gaskets, or even fracture housings, leading to costly repairs. For example, over-tightening the pan bolts can warp the pan and cause a significant leak.

Q2

Should I use new bolts when reassembling the AL450 transmission?

It's generally recommended to replace certain bolts, especially those that are torque-to-yield (TTY) or stretch bolts. These bolts are designed to be tightened to a specific torque and then an additional angle, causing them to stretch slightly. Reusing TTY bolts can lead to inconsistent clamping force and potential failure. For example, the transmission housing bolts are usually not TTY, however the bellhousing bolts should be checked for TTY specification.

Q3

What type of lubricant should I use on bolts before tightening them?

Unless specified otherwise, clean, dry threads are ideal for most AL450 transmission bolts. Applying oil or grease can affect the achieved clamping force, leading to inaccurate torque. Some bolts may require a thread locker compound; refer to the specific workshop manual for instructions. Avoid applying anti-seize unless explicitly stated for a particular bolt. Applying thread locker where not required can lead to binding and difficult removal next time.

Q4

How do I know if I have properly torqued a bolt?

Always use a calibrated torque wrench and ensure it is set to the correct specification. Tighten fasteners in a progressive pattern (e.g. star pattern for pans) to evenly distribute clamping forces. After tightening all bolts to their prescribed values, recheck the whole sequence to ensure none were missed. For torque-to-angle applications, make sure to turn the required number of degrees, using an angle gauge if needed. Never rely on 'feel'; proper tools are essential.

Q5

What happens if I strip the threads on a transmission bolt hole?

Stripped threads are problematic. If possible, repair by inserting a thread repair insert (such as a Heli-Coil). These inserts provide a new, strong thread. For less severe cases, a tap may be used to clean the threads. If the damage is severe, the component may need to be replaced. It's essential to prevent this issue with accurate torque techniques and calibrated tools from the beginning.

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 high-quality torque wrench is essential for accurately tightening bolts to specification. 1/2 inch drive is recommended for the torque ranges encountered in the AL450 transmission.

  • Click-type mechanism
  • Wide torque range (e.g., 20-200 Nm)
Learn more

Torque Wrench (3/8 inch drive)

A 3/8 inch drive torque wrench is useful for accessing smaller bolts in the transmission bellhousing or other areas.

  • Click-type mechanism
  • Smaller torque ranges (e.g., 10-80Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including various depths, is needed to fit the diverse sizes of transmission bolts.

  • Standard and deep sockets
  • Common sizes (e.g., 10mm, 12mm, 13mm, 16mm, 17mm, 19mm)
Learn more

Universal Joint

A universal joint is helpful for accessing bolts in awkward positions.

  • 1/2 inch and/or 3/8 inch drive options
  • Allows socket to reach around obstructions
Learn more

Extension Bars

Extension bars of various lengths can help to reach bolts recessed inside the transmission housing

  • 1/2 inch and 3/8 inch drive options
  • Various lengths available
Learn more
Service Procedures

AL450 Transmission Bellhousing Bolt Torque Procedure

This procedure outlines how to correctly torque the bellhousing bolts on the AL450 transmission in a 2000-2001 Audi RS4.

  • Locate all bellhousing bolts.
  • Clean all bolts and threaded holes of debris.
  • Install all bolts by hand initially.
  • Tighten the bolts in a criss-cross pattern to the specified initial torque of 20 Nm.
  • Using the same criss-cross pattern, tighten the bolts to the final torque of 45 Nm.
  • Double check all torques.
View full procedure

AL450 Transmission Pan Bolt Torque Procedure

This procedure outlines how to correctly torque the transmission pan bolts on the AL450 transmission in a 2000-2001 Audi RS4.

  • Locate all transmission pan bolts.
  • Clean all bolts and threaded holes of debris.
  • Install all bolts by hand initially with a new gasket.
  • Tighten the bolts in a criss-cross pattern to the specified torque of 12 Nm.
  • Double check all torques.
View full procedure

AL450 Transmission Mount Bolt Torque Procedure

This procedure outlines how to correctly torque the transmission mount bolts on the AL450 transmission in a 2000-2001 Audi RS4.

  • Locate all transmission mount bolts.
  • Clean all bolts and threaded holes of debris.
  • Install all bolts by hand initially.
  • Tighten the bolts to the specified torque of 60 Nm for main mount to chassis, and 25Nm for mount to transmission.
  • Double check all torques.
View full procedure
Technical Service Bulletins

AL450 Transmission Bolt Retorque Recommendation

2002-05-15

Early production models of the AL450 transmission have experienced minor bolt loosening over time. A retorque procedure is recommended after 10,000 miles.

2000-2001 Audi RS4

Resolution: Perform a retorque of all bellhousing bolts to 45 Nm and pan bolts to 12 Nm after the vehicle has accumulated 10,000 miles or as part of a routine service.

AL450 Transmission Pan Gasket Leakage Issue

2001-11-20

Some AL450 transmissions have experienced minor leaks due to improper pan bolt torque or issues with the original pan gasket.

2000-2001 Audi RS4

Resolution: When replacing the transmission pan gasket ensure to use a new gasket, clean all mating surfaces, and torque pan bolts to 12Nm. Do not over-tighten.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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