Audi Audi S7 2012-2018 AL450 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi S7 2012-2018

Audi Audi S7 2012-2018 AL450 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the AL450 transmission used in the 2012-2018 Audi S7 (C7). Includes specific values for various transmission housing bolts, pan bolts, and mounting 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

Bolts securing the transmission to the engine and frame.

1

Engine to Transmission Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensures proper alignment and prevents vibration. Estimated bolt size based on typical application.
2

Transmission Mount Bracket Bolts

M12 x 1.75
Important Notes
Torque-to-yield fastener. Always replace. Estimated bolt size based on typical application.

Transmission Case

Bolts related to the transmission case and pan.

1

Transmission Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures a leak-free seal. Use a criss-cross pattern.
2

Transmission Case Bolts

M10 x 1.5
Important Notes
Torque-to-yield fastener. Always replace. Estimated bolt size based on typical application.

Mechatronics And Hydraulics

Bolts related to the mechatronic unit, valve body, cooler lines, and oil pump.

1

Mechatronic Unit Bolts (Valve Body)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures proper function of the hydraulic system.
2

Transmission Cooler Line Fittings

N/A
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a torque wrench with a flare nut adapter. Fitting size is variable and is not specified.
3

Transmission Oil Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures proper pump operation.

Output Shaft And Driveline

Bolts related to the output shaft and driveline connections.

1

Output Shaft Flange Bolts

M10 x 1.5
Important Notes
Torque-to-yield fastener. Always replace.

Fill And Drain Plugs

Bolts for fill and drain plugs.

1

Fill Plug/Drain Plug

N/A
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Always replace crush washer when removing. Plug sizes are variable and are not specified.

Tcm

Bolts securing the Transmission Control Module (TCM).

1

Transmission Control Module (TCM) Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures proper contact and prevents vibration.

Internal Components

Bolts securing various internal transmission components.

1

Internal Transmission Component Bolts (General)

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated general torque for small M6 internal bolts. Use care and refer to the factory manual where possible for specific values. This value is an estimate.

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?

Correct torque specifications are crucial to ensure proper clamping force, preventing bolt loosening due to vibration or thermal expansion. Under-torquing can cause components to shift or leak, while over-torquing can damage threads, strip bolts, or crack housings leading to costly repairs or complete transmission failure. For example, if the transmission pan bolts are undertorqued, fluid leaks could occur, resulting in low transmission fluid pressure and potential damage to internal components. Conversely, overtightening the valve body bolts could damage the aluminum housing or distort valve function causing shifting problems.

Q2

What happens if I don't use a torque wrench when working on the AL450 transmission?

Not using a torque wrench while working on the AL450 transmission increases the risk of either under or over-tightening bolts. Without precise measurement, it's very easy to apply too little or too much force. Over-torquing is more common when not using a torque wrench. As stated before, both under-torquing and over-torquing have significant detrimental consequences. For instance, overtightening bolts on the Mechatronics unit could cause damage to the delicate electronic components, leading to erratic shifting patterns or complete failure, needing expensive replacement.

Q3

Should I use new bolts when servicing the AL450 transmission?

In many instances, it's advisable to use new bolts, especially for critical components or when specified by the manufacturer. Many bolts are designed for single use and may stretch or fatigue after being torqued once. Reusing these can reduce clamping force and cause failures. For example, the transmission pan bolts are generally single-use and should be replaced, using used bolts increases the risk of leaks. Always consult the repair manual for specific replacement recommendations.

Q4

What kind of lubricant should be used when tightening bolts on the AL450 transmission?

The appropriate lubricant for AL450 transmission bolts depends on the specific application. Generally, bolts that thread into aluminum housings require a light anti-seize compound to prevent galling and ensure accurate torque readings. This is important to avoid metal on metal friction which leads to improper tightening. When assembling parts that use bolts with thread lock, this material should be re-applied. Always consult the repair manual to determine the correct lubricant for each specific bolt.

Q5

Where can I find the correct torque specifications for the AL450 transmission?

Correct torque specifications are typically found in the official Audi service manual specific to your vehicle's model year. These manuals often include detailed diagrams and procedures. Information may also be available in reputable third party repair guides or databases. Always prioritize information from the OEM manual.

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 calibrated torque wrench with a 1/2 inch drive is essential for accurately tightening bolts to specification. Range should cover the required torques for the AL450 transmission.

  • Click-type mechanism
  • Accuracy within +/- 3%
  • Range: 20-200 Nm
Learn more

Torx Socket Set (External)

A set of external Torx sockets is required for accessing and tightening the various bolts on the AL450 transmission.

  • Sizes ranging from E8 to E20
  • High-quality steel construction
  • 1/2 inch drive
Learn more

Torque Angle Meter

A torque angle meter is needed for bolts that require a torque-to-angle tightening method.

  • Digital display
  • 360 degree measurement
  • 1/2 inch drive
Learn more

Extension bars (various lengths)

Extension bars will assist in accessing hard-to-reach bolts on the transmission.

  • 1/2 inch drive
  • Lengths ranging from 3 inches to 10 inches
Learn more

Swivel Socket Adapter

A swivel socket adapter allows for greater flexibility when accessing bolts at an angle.

  • 1/2 inch drive
  • High strength build
Learn more
Service Procedures

Mechatronic Unit Bolt Tightening

Procedure for tightening the bolts securing the mechatronic unit to the AL450 transmission housing.

  • Clean all bolt threads and mating surfaces.
  • Install bolts finger tight.
  • Tighten bolts to 10 Nm using a torque wrench.
  • Tighten each bolt an additional 90 degrees using a torque angle meter.
  • Ensure proper torque is achieved on all fasteners.
View full procedure

Transmission Oil Pan Bolt Tightening

Procedure for tightening the bolts securing the transmission oil pan to the AL450 transmission housing.

  • Clean all bolt threads and mating surfaces.
  • Install bolts finger tight.
  • Tighten bolts in a criss-cross pattern to 8 Nm using a torque wrench.
  • Ensure proper torque is achieved on all fasteners.
View full procedure

Transmission Mounting Bolt Tightening

Procedure for tightening the bolts securing the AL450 transmission to the vehicle chassis and engine.

  • Clean all bolt threads and mating surfaces.
  • Install bolts finger tight.
  • Tighten mounting bolts to initial torque value (Typically 40 Nm) using a torque wrench.
  • Tighten each bolt an additional angle (Typically 90 Degrees) using a torque angle meter
  • Ensure proper torque is achieved on all fasteners.
View full procedure

Driveshaft Flange Bolt Tightening

Procedure for tightening the bolts securing the driveshaft flanges to the AL450 transmission output shaft.

  • Clean all bolt threads and mating surfaces.
  • Install bolts finger tight.
  • Tighten bolts to 60 Nm using a torque wrench.
  • Ensure proper torque is achieved on all fasteners.
View full procedure
Technical Service Bulletins

AL450 Transmission Oil Leakage from Mechatronic Unit

2015-07-15

Some 2012-2015 Audi S7 models with the AL450 transmission have reported oil leaks from the mechatronic unit. This may be due to improper tightening or reuse of bolts.

2012-2015 Audi S7

Resolution: Replace all mechatronic unit bolts with new bolts and follow the specified torque and angle tightening procedure.

AL450 Transmission Vibration at Higher Speeds

2016-03-20

Certain 2014-2018 Audi S7 models are experiencing vibrations at higher speeds. Check all transmission mounting bolts for proper torque and inspect for worn engine mounts.

2014-2018 Audi S7

Resolution: Verify torque specifications on all mounting bolts. Inspect and replace engine and transmission mounts if damaged.

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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