Audi Audi RS4 2005-2008 AL450 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 AL450 Transmission Torque Specifications

Detailed torque specifications for all bolts on the AL450 transmission used in the 2005-2008 Audi RS4 (B7) model.

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

Fasteners related to the main transmission case assembly.

1

Transmission Housing Bolts (General)

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on similar Audi aluminum transmission housings. Tighten bolts in a star pattern to evenly distribute the clamping force and prevent leaks. Ensure housing mating surfaces are clean and dry before assembly. Use a new gasket or sealant as necessary.

Valve Body And Mechatronics

Fasteners associated with the valve body and mechatronics unit, which control the hydraulic and electronic functions of the transmission.

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on industry standards for valve bodies. These are usually smaller M6 bolts. Do not overtighten as this can damage the valve body. Tighten bolts evenly.
2

Mechatronics Unit Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on industry standards for mechatronics units. These are smaller M6 bolts. Do not overtighten as this can damage the mechatronics unit. Tighten evenly.

Oil Pan

Fasteners used to secure the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Estimated value based on similar Audi oil pan bolts. Tighten bolts in a star pattern to prevent leaks and evenly compress the gasket. Do not overtighten, which can deform the pan and cause leaks.

Torque Converter

Fasteners related to the connection between the torque converter and the engine's flexplate or flywheel.

1

Torque Converter Bolts (Flywheel/Flexplate)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar Audi torque converter bolts. Use thread locker. Tighten bolts evenly in a star pattern.

Transmission Mounts

Fasteners that secure the transmission to the vehicle chassis.

1

Transmission Mount Bolts (Transmission Side)

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar Audi transmission mounts. Use thread locker on these bolts to ensure they do not loosen over time.
2

Transmission Mount Bolts (Body Side)

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar Audi transmission mounts. Use thread locker on these bolts to ensure they do not loosen over time.

Output Flanges

Fasteners for securing the output flanges to the transmission, where the driveshafts attach.

1

Output Flange Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar Audi output flange bolts. Tighten evenly to ensure a secure and balanced connection.

Fluid Plugs

Fasteners used for filling and draining transmission fluid.

1

Fill/Drain Plugs (Transmission)

M16 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar Audi transmission fill/drain plugs. Always replace the aluminum crush washer to prevent leaks.

Cooler Lines

Fasteners for connecting the transmission cooler lines.

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on common transmission cooler line fittings. Ensure sealing washers are in good condition and properly seated. Over-tightening can damage the fittings and cause leaks.

Internal Filter

Fasteners used to secure the internal transmission filter housing.

1

Internal Transmission Filter Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar internal filter housing bolts. Do not overtighten as it can damage the housing.

Range Sensor

Fasteners used to secure the transmission range sensor to the transmission.

1

Range Sensor Bolts

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar range sensor mounting bolts. Do not overtighten as it can damage the sensor housing.

Bellhousing

Fasteners connecting the transmission bellhousing to the engine block.

1

Bellhousing Bolts (Engine Side)

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on similar Audi bellhousing bolts. These bolts should be torqued evenly to ensure proper alignment of the transmission to the engine.

Control Module

Fasteners for securing external control modules to the transmission housing.

1

Control Module Mounting Bolts (External)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar Audi module mounting bolts. Do not overtighten as this can damage the module housing.

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 correct torque specifications so important for the AL450 transmission bolts?

Correct torque is crucial for several reasons. Under-torquing can lead to bolts loosening over time, causing leaks, component misalignment, and ultimately, transmission damage. Over-torquing can stretch or break bolts, damage threads, or warp the transmission case or internal components. For example, incorrect torque on the transmission pan bolts can cause fluid leaks, leading to low fluid levels and severe transmission problems. Using a calibrated torque wrench and following these specs precisely ensures proper clamping force and long-term reliability of the transmission.

Q2

Should I use new bolts when reassembling the AL450 transmission?

It is generally highly recommended to replace bolts, especially those that are torque-to-yield (TTY). Many AL450 transmission bolts are TTY and designed for a single use. Reusing these bolts can lead to inaccurate clamping forces and potential failures. Always consult the repair manual for your 2005-2008 Audi RS4 to confirm which bolts should be replaced. For example, the bell housing bolts are often recommended for replacement on reassembly.

Q3

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

Using a torque wrench is essential for applying the correct torque specification. Without it, you risk either over or under-tightening the bolts. Guessing or relying on feel can have serious consequences. For instance, overtightening transmission mount bolts can damage the transmission case, while undertightening can lead to excessive movement and premature mount wear. The use of a correctly calibrated torque wrench is crucial for accurate and safe results.

Q4

What type of threadlocker, if any, should I use on the transmission bolts?

The repair manual for your 2005-2008 Audi RS4 will specify if threadlocker is required for certain AL450 transmission bolts. If specified, always use the recommended type and grade. For instance, medium-strength threadlocker (like Loctite 243) might be specified on bolts subject to vibration. Using the wrong type of threadlocker or omitting it when required can compromise the integrity of the assembly. Always consult the repair manual to ensure correct usage.

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

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values, preventing damage to the transmission case and components.

  • Adjustable torque range (covering required specifications)
  • Clearly marked scale for accurate readings
Learn more

Socket Set

A comprehensive socket set, including various metric sizes, is necessary to fit the different bolt heads on the AL450 transmission.

  • Metric sizes
  • Various drive sizes (3/8 inch, 1/2 inch)
Learn more

Extension Bars

Extension bars are needed to reach recessed or difficult-to-access bolts on the transmission.

  • Various lengths for different access needs
  • Durable construction
Learn more

Universal Joint (Swivel Adapter)

A universal joint adapter is crucial for applying torque to bolts at an angle.

  • Flexible rotation
  • Strong build
Learn more
Service Procedures

AL450 Transmission Bell Housing Bolt Tightening

This procedure details the steps to correctly tighten the bell housing bolts on the AL450 transmission.

  • Locate all bell housing bolts.
  • Apply a small amount of anti-seize to bolt threads.
  • Install all bolts by hand to avoid cross-threading.
  • Torque all bolts to 40 Nm (29 ft-lbs) using the recommended tool in a criss-cross pattern.
  • Double-check the torque on each bolt.
View full procedure

AL450 Transmission Mounting Bolt Tightening

This procedure details the steps to correctly tighten the transmission mounting bolts to the vehicle.

  • Locate all transmission mounting bolts.
  • Apply a small amount of anti-seize to bolt threads.
  • Install all bolts by hand to avoid cross-threading.
  • Torque all bolts to 60 Nm (44 ft-lbs) using the recommended tool in a criss-cross pattern.
  • Double-check the torque on each bolt.
View full procedure

AL450 Transmission Pan Bolt Tightening

This procedure details the steps to correctly tighten the transmission oil pan bolts on the AL450 transmission.

  • Locate all transmission oil pan bolts.
  • Apply a small amount of anti-seize to bolt threads.
  • Install all bolts by hand to avoid cross-threading.
  • Torque all bolts to 15 Nm (11 ft-lbs) using the recommended tool in a criss-cross pattern.
  • Double-check the torque on each bolt.
View full procedure

AL450 Mechatronic Unit Bolt Tightening

This procedure details the steps to correctly tighten the mechatronic unit bolts on the AL450 transmission.

  • Locate all mechatronic unit bolts.
  • Apply a small amount of anti-seize to bolt threads.
  • Install all bolts by hand to avoid cross-threading.
  • Torque all bolts to 10 Nm (7 ft-lbs) using the recommended tool in a criss-cross pattern.
  • Double-check the torque on each bolt.
View full procedure
Technical Service Bulletins

AL450 Transmission Bolt Loosening Issues

2006-11-15

Some early AL450 transmissions in the RS4 have experienced premature loosening of bell housing bolts due to inadequate factory torque application.

2005-2006

Resolution: Inspect and re-torque bell housing bolts to the specified 40 Nm (29 ft-lbs) using a quality torque wrench. Apply a thread locking compound if necessary. Ensure torque wrench calibration is up-to-date.

Updated Torque Specifications for AL450 Mounting Bolts

2007-04-02

A revision to the torque specification of the transmission mounting bolts has been released by Audi, the updated torque spec is 60 Nm (44 ft-lbs)

2005-2008

Resolution: Re-torque transmission mounting bolts to the updated torque specification of 60 Nm (44 ft-lbs). Ensure proper tool selection and calibration of the torque wrench.

About the Author

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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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