Audi Audi S5 2007-2016 AL450 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi S5 2007-2016

Audi Audi S5 2007-2016 AL450 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the AL450 transmission found in the 2007-2016 Audi S5, including bellhousing, pan, and mount bolts.

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 Mounting

Specifications for bolts securing the transmission to the engine and vehicle chassis.

1

Transmission Mount Bolts (Engine Side)

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission mount to the engine-side bracket. Estimated value based on similar mount bolts. Use new bolts if available.
2

Transmission Mount Bolts (Transmission Side)

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission mount to the transmission case. Estimated value based on similar mount bolts. Use new bolts if available.
3

Transmission to Engine Bolts (Bell Housing Bolts)

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the transmission to the engine. Critical for proper alignment and preventing leaks. Estimated based on standard bellhousing bolts.

Transmission Case

Specifications for bolts related to the transmission case, fluid pan, and internal components.

1

Transmission Fluid Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the transmission fluid pan. Requires a crisscross tightening sequence to prevent leaks. Estimated based on common transmission pan bolts.
2

Transmission Oil Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten the drain plug to prevent fluid leakage. Always use a new crush washer. Estimated based on common drain plugs.
3

Transmission Oil Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten the fill plug to prevent fluid leakage. Ensure the O-ring or crush washer is in good condition. Estimated based on common fill plugs.

Internal Components

Specifications for bolts securing internal transmission components such as the mechatronic unit and valve body.

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the mechatronic unit inside the transmission. Requires a light crisscross tightening sequence. Estimated based on similar size fasteners and their application.
2

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the valve body inside the transmission. Requires a light and precise crisscross tightening sequence. Estimated based on similar size fasteners and their application.

Shaft Housings

Specifications for bolts securing the input and output shaft housings.

1

Input Shaft Housing Bolts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the input shaft housing to the transmission case. Estimated based on similar housing bolts.
2

Output Shaft Housing Bolts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the output shaft housing to the transmission case. Estimated based on similar housing bolts.

External Connections

Specifications for bolts related to external connections such as driveshafts and cooler lines.

1

Driveshaft to Transmission Flange Bolts (Front & Rear)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the driveshaft to the transmission output flange. Estimated based on similar driveshaft bolts.
2

Transmission Cooler Line Fittings

M14 x 1.5 (Banjo)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures transmission fluid cooler lines. Always use a new sealing washer. Estimated based on similar fittings.

Shift Mechanism

Specifications for bolts related to the shift mechanism.

1

Selector Shaft Bolt/Nut

M8 x 1.25
Important Notes
Secures the shift lever or selector mechanism. Requires an additional 90-degree turn after reaching specified torque. Estimated based on typical Audi selector shaft mechanisms.

Transfer Case

Specifications for bolts securing the transfer case to the transmission.

1

Transfer Case Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Applies if the vehicle has Quattro all-wheel-drive. Secures the transfer case to the transmission. Estimated based on similar Audi AWD transfer case mounts. These are safety critical 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 are correct torque specifications important for the AL450 transmission?

Correct torque is crucial for the AL450 transmission's proper function and longevity. Over-tightening bolts can damage threads, warp components, and lead to leaks, while under-tightening can result in bolts loosening, causing vibrations, oil leaks, or even component failure. Using the correct torque ensures that clamping force is distributed evenly across the mating surfaces, preventing these issues and maintaining the structural integrity of the transmission.

Q2

What happens if I over-torque the transmission pan bolts?

Over-torquing the transmission pan bolts on an AL450 can crush the transmission pan gasket, causing leaks. It can also strip the threads in the aluminum transmission case, requiring costly repairs, such as thread inserts or even a new case. Additionally, over-tightening could distort the pan itself.

Q3

Can I use a regular torque wrench or do I need a special one?

A standard, calibrated torque wrench that covers the specified torque range for the AL450 transmission bolts is generally sufficient. However, for tight or hard to reach areas, a smaller, more precise torque wrench may be necessary. Always use a torque wrench with the correct torque range for the bolt size and material, and ensure its calibration is up to date. Never rely on just 'feel'.

Q4

How often should I check the torque on the transmission bolts after working on it?

It's recommended to re-check the torque on transmission bolts after a short initial drive (e.g., 50-100 miles), particularly after any major service that involves disassembling or reassembling the unit. This allows for any initial settling or movement and ensures that everything stays properly torqued. A final check after 500-1000 miles is recommended as a precaution.

Q5

Are the torque specifications the same for all bolts on the AL450 transmission?

No, torque specifications vary depending on the bolt size, material, and location on the AL450 transmission. Always refer to the specific torque specifications listed in the vehicle's repair manual or a reputable online database for the exact location you are working on. The pan bolts for example have a different spec than the bellhousing bolts.

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 manufacturer's specified torque values. This tool ensures bolts are not over or under tightened.

  • Adjustable torque range suitable for AL450 transmission bolts (typically between 10-100 Nm)
  • Click-type or digital readout for accurate torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including various sizes and extensions, is needed to access and fasten the diverse bolt sizes used on the AL450 transmission.

  • Wide range of sizes to accommodate various AL450 bolts.
  • 6-point sockets are recommended for optimal bolt grip and to minimize rounding.
Learn more

Extension Bars

Extension bars of different lengths will provide needed reach to access all of the transmission bolts.

  • 1/2-inch or 3/8-inch drive, matching your torque wrench.
  • Various lengths to allow access to all transmission bolts.
Learn more

Universal Joint

A universal joint or swivel adapter allows the socket to be used at an angle when necessary to access bolts that are not on a straight plane.

  • 1/2-inch or 3/8-inch drive, matching your torque wrench and extensions.
  • Durable construction to withstand torque application.
Learn more

Torque Angle Gauge (optional)

For bolts that require torque-to-yield tightening sequences, a torque angle gauge is sometimes required.

  • Allows precise angle measurement after initial torque.
  • Ensures proper bolt stretch during installation
Learn more
Service Procedures

AL450 Transmission Pan Removal and Installation

This procedure covers the removal and installation of the transmission pan, including the correct tightening sequence and torque values for the pan bolts.

  • Drain the transmission fluid.
  • Remove all bolts retaining the pan.
  • Carefully remove the pan from the transmission housing, being aware of residual fluid
  • Clean the mating surfaces of the transmission case and pan.
  • Install the new pan gasket onto the pan.
  • Position the pan against the transmission case, and start each bolt by hand, do not tighten yet.
  • Tighten the bolts in a criss-cross pattern to the specified torque value (10Nm).
  • Refill the transmission with new fluid and check the fluid level according to the manufacturer’s procedure.
View full procedure

AL450 Transmission Mechatronic Unit Bolt Torque

This procedure outlines the process of properly torquing bolts during the removal and installation of the mechatronic unit.

  • Disconnect the transmission electrical harness.
  • Remove the retaining bolts holding the mechatronic unit.
  • Carefully remove the old mechatronic unit.
  • Install new seals in the mechatronic unit housing.
  • Carefully align and install the new or rebuilt mechatronic unit.
  • Start the bolts by hand, do not tighten yet.
  • Tighten the mechatronic unit bolts to the specified torque value (8Nm) in a criss-cross pattern, in 2 steps.
  • Re-connect the transmission electrical harness
View full procedure

AL450 Valve Body Bolt Torque Procedure

This procedure outlines the bolt torques on the valve body.

  • Remove the mechatronic unit.
  • Carefully remove the valve body.
  • Install the new valve body.
  • Start the valve body bolts by hand, do not tighten yet.
  • Tighten the valve body bolts to the specified torque value (8Nm) in a criss-cross pattern, in 2 steps.
  • Re-install the mechatronic unit.
View full procedure
Technical Service Bulletins

Technical Service Bulletin - AL450 Transmission Pan Leaks

2012-05-15

This bulletin addresses reports of oil leaks from the transmission oil pan. These leaks are often caused by improper sealing due to reuse of the old gasket, and/or incorrect tightening of pan bolts.

2007-2012 Audi S5 with AL450 transmission

Resolution: Always replace the oil pan gasket when removing and reinstalling the transmission pan. Tighten the pan bolts in a criss-cross pattern to a torque value of 10 Nm. Ensure the mating surfaces are clean before installing the new gasket.

Technical Service Bulletin - Mechatronic Unit Bolt Failure

2014-11-20

This bulletin addresses instances of mechatronic unit retaining bolt failure or loosening. Improper torque can cause the bolts to come loose over time.

2007-2016 Audi S5 with AL450 transmission

Resolution: Always replace the mechatronic unit bolts when removing and reinstalling. Ensure that the bolts are tightened in a criss-cross pattern in 2 steps to a torque value of 8Nm.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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