Audi Audi S6 2012-2018 AL450 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi S6 2012-2018

Audi Audi S6 2012-2018 AL450 Transmission Torque Specifications

Detailed torque specifications for all bolts associated with the AL450 transmission in the 2012-2018 Audi S6 (C7) model. Includes bellhousing, pan, valve body, 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

Mechatronics Unit

Torque specifications for the mechatronics unit and its related components. This includes the electronic control module and valve body assembly.

1

Mechatronics Unit Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the mechatronics unit to the transmission housing. Proper torque is essential for hydraulic sealing and electronic module functionality. Estimated value based on similar applications.
2

Valve Body Mounting Bolts

M5 x 0.8
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secures the valve body assembly to the transmission housing. Low torque is used to prevent damage to the sensitive valve body components. Estimated value based on similar applications.

Transmission Case

Torque specifications for the main transmission housing, including case-to-case bolts and oil pan bolts.

1

Transmission Housing Bolts (Case-to-Case)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Joins the main transmission case halves. Crucial for structural integrity and oil sealing. Estimated value based on similar applications.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Secures the oil pan to the transmission housing, providing a leak-proof seal. Estimated value based on similar applications.

Mounting

Torque specifications for securing the transmission to the vehicle chassis, including both body and transmission mount bolts.

1

Transmission Mount Bolts (to Body)

M12 x 1.75
Important Notes
These bolts secure the transmission mount to the chassis. Critical for minimizing vibrations. Use new bolts. Estimated value based on similar applications and industry standard torque to yield.
2

Transmission Mount Bolts (to Transmission)

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Secures the transmission to the transmission mount. Important for vibration dampening and ensuring secure mounting. Estimated value based on similar applications.

Torque Converter

Torque specifications for bolts connecting the torque converter to the engine's flexplate.

1

Torque Converter Bolts (to Flexplate)

M10 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
These critical bolts join the torque converter to the engine's flexplate. Use a thread-locking compound. Estimated value based on similar applications and industry standard.

Driveshaft

Torque specifications for components related to the driveshaft and output flanges.

1

Output Flange Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Fastens the output flanges for driveshafts. Estimated value based on similar applications and industry standard.

Fluid System

Torque specifications for components related to the transmission fluid system, such as cooler lines, drain plugs, and fill plugs.

1

Oil Cooler Line Fittings

M16 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Proper torque is needed for leak-free sealing of the transmission cooler lines. May require special tools and check for O-rings. Estimated value based on industry standard.
2

Transmission Fluid Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission drain hole. Prevents leaks. Usually a sealing washer needs to be replaced. Estimated value based on similar applications.
3

Transmission Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission fill hole. Prevents leaks, and is important when proper fill level is required. Estimated value based on similar applications.

Actuation

Torque specifications for components related to the parking pawl actuator and shift shaft detent mechanisms.

1

Parking Pawl Actuator Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts mount the parking pawl actuator to the transmission case. Estimated value based on industry standard for small actuator.
2

Shift Shaft Detent Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the shift shaft detent mechanism within the transmission. Estimated value based on industry standard for small fasteners.

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 when working on the AL450 transmission?

Correct torque specifications are crucial to ensure proper clamping force between components, preventing leaks, damage, and premature wear. Under-torquing can lead to loosening and leaks, while over-torquing can strip threads, deform components, or crack housings. For example, if the transmission pan bolts are not torqued properly, fluid leaks are likely to occur.

Q2

What happens if I over-torque a bolt on the AL450 transmission?

Over-torquing a bolt on the AL450 transmission can cause several issues. The threads in the aluminum transmission case can be easily stripped, requiring expensive repairs. Over-torquing can also distort gaskets, leading to leaks, and potentially damage internal transmission components. A common example would be stripping the threads on the valve body bolts due to excessive torque, necessitating replacement of the entire valve body.

Q3

Do I need to use new bolts when working on the AL450 transmission?

While not always mandatory, it is highly recommended to use new bolts when reassembling the AL450 transmission, especially for critical components like the valve body, mechatronic unit, and transmission pan. New bolts ensure proper clamping force and reduce the risk of failure. Some bolts are torque-to-yield (TTY) and must be replaced every time they are removed. For example, the bolts securing the Mechatronic unit are commonly TTY bolts.

Q4

Should I use thread locker on any bolts when working on the AL450 transmission?

Thread locker is typically not used on most bolts when assembling the AL450 transmission, as it is usually unnecessary with the correct torque specification and condition of the threads. However, some components may have specific applications for threadlocker, indicated in the repair manual. Always consult the factory service manual for specific applications. For instance, some specific bolts within the valve body may specify the use of a low-strength threadlocker.

Q5

What tools are recommended for accurately torquing bolts on the AL450 transmission?

A high-quality calibrated torque wrench is essential for accurately torquing bolts on the AL450 transmission. Using a digital torque wrench provides the most accurate reading. It's also important to have a variety of socket sizes and extensions to reach all bolt locations. Avoid relying on feel or generic tools, as this can lead to incorrect torque and potential damage. For example, a 1/4" drive torque wrench is ideal for low torque specifications, while a 3/8" or 1/2" drive torque wrench will be necessary for larger 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 (1/2" Drive)

A high-quality torque wrench is crucial for applying precise torque to transmission bolts.

  • Wide torque range (typically 10-150 ft-lbs or equivalent)
  • Accurate calibration
  • Click-type or digital display
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for bolts with lower torque specifications.

  • Smaller torque range (typically 5-80 ft-lbs or equivalent)
  • Accurate calibration
  • Click-type or digital display
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolt sizes on the AL450 transmission.

  • Standard depths and deep sockets
  • Sizes ranging from 8mm to 21mm (or larger)
  • Impact-rated sockets recommended
Learn more

Extension Bars (Various Lengths)

Extension bars provide reach and access to bolts in recessed or hard-to-reach areas of the transmission.

  • 3-inch, 6-inch, and 10-inch lengths recommended
  • Strong construction to withstand torque
Learn more

Universal Joint

Allows for angled access to bolts when a straight socket won't fit.

  • Durable construction
  • Smooth movement
Learn more
Service Procedures

Mechatronic Unit Bolt Torque Procedure

Procedure for tightening the bolts that secure the Mechatronic unit to the transmission housing.

  • Clean all bolt threads and mating surfaces.
  • Install the bolts by hand until they are snug.
  • Using a 3/8" torque wrench, torque the M6 bolts to 8 Nm (6 lb-ft).
  • Using a 3/8" torque wrench, torque the M8 bolts to 20 Nm (15 lb-ft).
  • Torque all bolts in a cross pattern to ensure even clamping force.
View full procedure

Transmission Pan Bolt Torque Procedure

Procedure for tightening the bolts that secure the transmission oil pan.

  • Clean all bolt threads and mating surfaces.
  • Install the bolts by hand until they are snug.
  • Using a 3/8" torque wrench, torque the pan bolts to 8 Nm (6 lb-ft).
  • Torque all bolts in a cross pattern to ensure even clamping force.
View full procedure

Transmission Mount Bolt Torque Procedure

Procedure for tightening the bolts that secure the transmission mount to the vehicle body and transmission housing.

  • Clean all bolt threads and mating surfaces.
  • Install the bolts by hand until they are snug.
  • Using a 1/2" torque wrench, torque the transmission mount to chassis bolts to 40 Nm (30 lb-ft) plus 90 degrees.
  • Using a 1/2" torque wrench, torque the transmission mount to transmission bolts to 60 Nm (44 lb-ft) plus 90 degrees.
  • Torque all bolts in a cross pattern to ensure even clamping force.
View full procedure

Transmission Fill and Drain Plug Torque Procedure

Procedure for tightening the fill and drain plugs on the transmission.

  • Clean all plug threads and mating surfaces.
  • Install the fill and drain plugs by hand until they are snug.
  • Using a 1/2" torque wrench, torque both plugs to 45 Nm (33 lb-ft).
View full procedure
Technical Service Bulletins

AL450 Transmission Mechatronic Sealing Issues

2016-04-15

Some AL450 transmissions may experience leaks around the Mechatronic unit seal due to improper torque or sealant issues.

2012-2015 Audi S6

Resolution: Inspect the Mechatronic seal. Replace the seal and use the proper torque specifications (8 Nm for M6 and 20 Nm for M8 bolts) and approved sealant during reinstallation.

AL450 Transmission Pan Leakage

2017-11-20

Some AL450 transmissions may experience leaks from the transmission oil pan, especially after service.

2012-2018 Audi S6

Resolution: Ensure the transmission pan mating surface is clean. Use a new pan gasket or RTV sealant per manufacturers spec. Torque pan bolts to 8 Nm in a cross pattern.

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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