Audi Audi TTS 2008-2014 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi TTS 2008-2014

Audi Audi TTS 2008-2014 Drivetrain Bolt Torque Specifications

Comprehensive list of torque specifications for drivetrain bolts on the 2008-2014 Audi TTS (Mk2) including transmission, differential, driveshaft, and related components.

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

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Torque Calculator

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Transmission Transfer Case

This section covers torque specifications for components related to the transmission and transfer case, responsible for transmitting power from the engine to the drivetrain.

1

Transmission-to-Engine Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the transmission housing to the engine block. Estimated value based on similar applications.
2

Transfer Case-to-Transmission Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Bolts that attach the transfer case to the transmission. Estimated value based on similar Audi models.
3

Transfer Case Output Flange Bolt (to Prop Shaft)

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the propeller shaft flange to the transfer case. Estimated value based on similar flange bolt applications.
4

Transmission Fill Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission fill hole. Estimated value based on industry standard for similar plugs.
5

Transmission Drain Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission drain hole. Estimated value based on industry standard for similar plugs.
6

Transfer Case Fill Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transfer case fill hole. Estimated value based on industry standard for similar plugs.
7

Transfer Case Drain Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transfer case drain hole. Estimated value based on industry standard for similar plugs.
8

Clutch Pressure Plate Bolts

M8 x 1.25
Important Notes
Secures the clutch pressure plate to the flywheel. Final tightening requires a 90-degree angle. Estimated value based on similar Audi models.
9

Clutch Slave Cylinder Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Secure the hydraulic slave cylinder. Estimated value based on bolt size and application.

Front Differential Axles

This section covers torque specifications for components related to the front differential and axles, responsible for transferring power to the front wheels.

1

Front Differential Housing Mounting Bolts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Secures the differential housing to the vehicle's frame/subframe. Estimated value based on similar Audi models.
2

Front Axle Shaft Bolt (CV Joint Bolt - Inner)

M10 x 1.5
Important Notes
Connects the axle to the transmission flange. Always use a new bolt. Estimated value based on similar Audi models.
3

Front Axle Shaft Bolt (CV Joint Bolt - Outer - Hub)

M14 x 1.5
Important Notes
Secures the axle shaft to the wheel hub/bearing assembly. Always use a new bolt. Estimated value based on similar Audi models.

Rear Differential Axles

This section covers torque specifications for components related to the rear differential and axles, responsible for transferring power to the rear wheels.

1

Rear Differential Housing Mounting Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the differential to the vehicle's chassis. Estimated value based on similar Audi models.
2

Rear Differential Cover Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the differential cover. Estimated value based on industry standard for similar covers.
3

Rear Differential Fill Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the rear differential fill hole. Estimated value based on industry standard for similar plugs.
4

Rear Differential Drain Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the rear differential drain hole. Estimated value based on industry standard for similar plugs.
5

Rear Axle Shaft Bolt (CV Joint Bolt - Inner)

M10 x 1.5
Important Notes
Secures the axle to the differential flange. Always use a new bolt. Estimated value based on similar Audi models.
6

Rear Axle Shaft Bolt (CV Joint Bolt - Outer - Hub)

M14 x 1.5
Important Notes
Secures the axle to the wheel hub. Always use a new bolt. Estimated value based on similar Audi models.

Driveshaft Propshaft

This section covers torque specifications for components related to the driveshaft or propeller shaft, responsible for transferring power from the transmission to the rear differential.

1

Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the driveshaft's center support bearing to the vehicle's underbody. Estimated value based on bolt size and application.
2

Driveshaft Flange Bolts (Front)

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Bolts that connect the driveshaft to the transfer case or transmission. Estimated value based on similar flange bolt applications.
3

Driveshaft Flange Bolts (Rear)

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Bolts that connect the driveshaft to the rear differential. Estimated value based on similar flange bolt applications.

Haldex Awd System

This section covers torque specifications for components related to the Haldex all-wheel drive system, responsible for controlling the distribution of power to the rear wheels.

1

Haldex Control Unit Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the Haldex control unit. Estimated value based on similar hydraulic unit applications.
2

Haldex Pump Mounting Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Secure the Haldex pump. Estimated value based on bolt size and application.
3

Haldex Oil Filter Housing Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Bolts that secure the filter housing. Estimated value based on bolt size and application.
4

Haldex Drain Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the Haldex unit drain hole. Estimated value based on industry standard for similar plugs.
5

Haldex Fill Plug

M22 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the Haldex unit fill hole. Estimated value based on industry standard for similar plugs.

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 drivetrain bolts?

Proper torque ensures bolts are tightened sufficiently to maintain clamping force, preventing loosening from vibration and stress, while also avoiding damage to threads or components due to over-tightening. Incorrect torque can lead to component failure, loss of vehicle control, and potential accidents. For example, a loose driveshaft bolt could cause the driveshaft to detach, leading to a dangerous situation.

Q2

Can I reuse drivetrain bolts after removal?

Generally, it is not recommended to reuse critical drivetrain bolts, especially those that are torque-to-yield (TTY). TTY bolts stretch when tightened to their specified torque and are designed for single use only. Reusing these bolts can lead to improper clamping force, potentially causing failure. Always refer to the Audi repair manual for specific bolt replacement guidelines. Using new bolts, especially for high-stress applications such as driveshaft or flywheel bolts, is critical for safety.

Q3

What does 'torque-to-yield' mean and how does it affect me?

Torque-to-yield (TTY) bolts are designed to stretch permanently when tightened to their specified torque, providing a consistent and reliable clamping force. They are commonly used in high-stress areas like the drivetrain. Unlike regular bolts, TTY bolts must be replaced every time they are loosened as their integrity is compromised after the initial stretch. Failure to replace them can lead to significant failure and safety issues. For example, many flywheel bolts on the TTS are TTY.

Q4

What if I don't have a torque wrench, can I 'just tighten it'?

Absolutely not. 'Just tightening it' is a dangerous practice. Without a torque wrench, you cannot ensure the correct tightening of the bolts. Under-tightening can lead to component failure, while over-tightening can cause threads to strip, bolts to stretch beyond their elastic limit or damage to the components being bolted. Using a torque wrench is essential for ensuring the safety and longevity of your vehicle's drivetrain components. Renting a torque wrench is often less costly than damage repair.

Q5

How often should I inspect my drivetrain bolts for proper torque?

It is a good idea to inspect drivetrain bolts at regular intervals. For standard street use, check bolts after major drivetrain repairs, such as transmission replacements, driveshaft work or clutch replacements. For vehicles used in performance or track driving, checking bolts every few track days or after heavy usage is recommended. Regular inspection can catch issues before they escalate into major problems.

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 calibrated torque wrench capable of measuring torque values within the specified range for drivetrain components.

  • Click-type mechanism for accurate torque application
  • Clearly marked torque scale
  • 1/2" drive for common socket sizes
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for accessing tighter areas and lower torque specifications.

  • Click-type mechanism for accurate torque application
  • Clearly marked torque scale
  • 3/8" drive for smaller fasteners
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to match the fasteners on the drivetrain.

  • Various sizes to fit all relevant bolts and nuts
  • 6-point design for secure grip
  • Durable construction
Learn more

Universal Joint Adapter

Allows access to bolts and nuts at awkward angles.

  • Flexible joint for reaching difficult locations
  • Durable construction
  • Standard drive sizes to match torque wrenches
Learn more

Extension Bars

Provides additional reach when fasteners are located deeper within the vehicle.

  • Various lengths available
  • Standard drive sizes to match torque wrenches and sockets
  • Durable construction
Learn more
Service Procedures

Rear Differential Mounting Bolt Torque Procedure

This procedure outlines the correct method for torquing the rear differential mounting bolts on the 2008-2014 Audi TTS.

  • Clean all bolt threads and mating surfaces.
  • Install the differential and hand tighten all mounting bolts.
  • Torque all mounting bolts to 40 Nm (30 ft-lbs).
  • Recheck all bolts to verify proper torque.
  • Tighten the bolts additionally to 90 degrees.
View full procedure

Driveshaft to Rear Differential Flange Bolt Torque Procedure

This procedure outlines the correct method for torquing the driveshaft to rear differential flange bolts on the 2008-2014 Audi TTS.

  • Clean all bolt threads and mating surfaces.
  • Install the driveshaft and hand tighten all flange bolts.
  • Torque all flange bolts to 70 Nm (52 ft-lbs).
  • Recheck all bolts to verify proper torque.
View full procedure

Haldex Unit Mounting Bolt Torque Procedure

This procedure outlines the correct method for torquing the Haldex unit mounting bolts on the 2008-2014 Audi TTS.

  • Clean all bolt threads and mating surfaces.
  • Install the Haldex unit and hand tighten all mounting bolts.
  • Torque the Haldex unit mounting bolts to 45 Nm (33 ft-lbs).
  • Recheck all bolts to verify proper torque.
View full procedure

Wheel Hub Nut Torque Procedure

This procedure outlines the correct method for torquing the wheel hub nut on the 2008-2014 Audi TTS.

  • Clean all threads and mating surfaces.
  • Install new wheel hub nut.
  • Torque wheel hub nut to 140 Nm (103 ft-lbs).
  • Turn wheel hub nut additionally 180 degrees.
  • Recheck torque and additional degree rotation.
View full procedure
Technical Service Bulletins

Rear Differential Mounting Bolt Loosening

2010-05-15

Some 2008-2010 Audi TTS models have reported issues with the rear differential mounting bolts loosening over time. This can lead to excessive noise and potential damage.

2008-2010

Resolution: Inspect and replace all rear differential mounting bolts with new bolts and follow the correct torque procedure. Use threadlocker if necessary.

Haldex Unit Bolt Corrosion Issues

2012-11-20

Certain 2009-2012 Audi TTS models have experienced corrosion issues with the Haldex unit mounting bolts, which can lead to incorrect clamping force.

2009-2012

Resolution: Inspect the Haldex unit mounting bolts for corrosion and replace with new, coated bolts. Ensure the mating surfaces are clean and free of corrosion before reinstalling the bolts. Apply anti-seize compound

Driveshaft Bolt Shear

2013-08-10

A small number of 2010-2013 Audi TTS models reported issues with driveshaft to differential flange bolts shearing due to over tightening.

2010-2013

Resolution: Always follow the correct torque procedure and use a calibrated torque wrench. Never reuse driveshaft flange bolts after removal.

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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