Audi Audi TTS 2008-2014 DQ250 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi TTS 2008-2014

Audi Audi TTS 2008-2014 DQ250 Transmission Torque Specifications

Detailed torque specifications for all bolts associated with the DQ250 transmission used in the 2008-2014 Audi TTS (Mk2). Includes torque values and tightening sequences.

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 To Engine

These bolts are critical for securely mounting the transmission to the engine block, ensuring proper alignment and preventing separation under load.

1

Transmission to Engine Block Bolts

M12 x 1.5
Important Notes
Torque to 44 ft-lbs (60 N·m), then turn an additional 90 degrees. These bolts are often torque-to-yield and must be replaced.

Mechatronic Unit

These bolts secure the mechatronic unit (valve body) to the transmission casing and its outer cover, sealing the electronics.

1

Mechatronic Unit Mounting Bolts (Internal)

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Overtightening can damage the delicate mechatronic unit housing and seals.
2

Mechatronic Unit Housing Bolts (External)

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the outer cover of the mechatronics unit to the transmission housing.
3

Clutch Actuator Mounting Bolts

M8
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar hydraulic units.

Transmission Mounts

Bolts securing the transmission mounts to the transmission housing and subframe/chassis.

1

Transmission Mount Bolts (to Transmission Housing)

M10 x 1.5
Important Notes
Torque to 30 ft-lbs (40 N·m), then turn an additional 90 degrees. Ensure proper mount alignment.
2

Transmission Mount Bolts (to Subframe/Chassis)

M12
Important Notes
Torque to 44 ft-lbs (60 N·m), then turn an additional 90 degrees. Ensure proper mount alignment.

Flywheel

Bolts securing the flywheel to the crankshaft. Critical for proper clutch function.

1

Flywheel/Dual-Mass Flywheel Bolts

M12 x 1.5
Important Notes
Torque to 44 ft-lbs (60 N·m), then turn an additional 90 degrees. These are single-use, torque-to-yield bolts and must be replaced when loosened. Use a star pattern.

Sensors

Bolts securing the various speed sensors of the transmission.

1

Input Shaft Sensor Bolt

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Securing the speed sensor for the input shaft.
2

Output Shaft Speed Sensor Bolts

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Securing the speed sensors for the output shaft.

Fluid Plugs

Bolts related to filling and draining the transmission fluid.

1

Oil Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission oil pan drain hole. Always replace the crush washer.
2

Oil Fill Plug/Level Check Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the oil fill hole and is used to check the transmission oil level. Always replace the crush washer.

Transmission Housing

Bolts securing the transmission case halves together.

1

Transmission Housing Bolts (Case Halves)

M10
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secure the two halves of the transmission case together. Tighten using a sequence moving outward from the center of the case.

Transfer Case

Bolts securing the transfer case to the transmission housing for models equipped with the Haldex system.

1

Transfer Case Mounting Bolts

M10
Important Notes
Torque to 30 ft-lbs (40 N·m), then turn an additional 90 degrees. Ensure proper alignment of the transfer case.

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 is using the correct torque specifications so critical for the DQ250 transmission?

Incorrect torque can lead to several problems. Over-tightening can strip threads, deform components, and cause premature failure. Under-tightening can result in bolts loosening over time due to vibration, leading to leaks, component shifting, and potentially catastrophic transmission damage. For example, if the mechatronic unit bolts are not torqued correctly, it can lead to pressure leaks and shifting issues.

Q2

What happens if I don't have a torque wrench for my DQ250 transmission bolt work?

While it may be tempting to 'guess' the torque, it is strongly discouraged. Without a torque wrench, there is no way to ensure proper tightness, increasing the risk of the problems mentioned above. Consider renting or borrowing a calibrated torque wrench before working on the transmission. In a pinch, you could try to estimate, but this is high risk, and if a bolt becomes overtightened there is no way to go back, it can ruin your whole transmission case.

Q3

Are there specific areas on the DQ250 that require extra attention when it comes to torque?

Yes, areas such as the mechatronic unit mounting bolts, transmission case bolts, and oil pan bolts require very specific torque values. These areas are susceptible to leaks if incorrectly torqued. For example, the mechatronic unit bolts are very small so easy to overtighten.

Q4

Should I use new bolts when working on the DQ250 transmission?

In many cases, yes. Some bolts are designed to be one-time use due to stretching after being torqued. This is common with flange bolts. Consulting the workshop manual is crucial. Reusing some bolts can lead to inadequate clamping force or bolt failure due to fatigue. If in doubt, using new hardware is always recommended.

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 for tightening bolts to the specified torque values. A 1/2" drive is recommended for the range of torque values used on the DQ250 transmission.

  • Wide torque range (typically 20-150 Nm)
  • Audible click or digital readout for accurate tightening
  • Reversible ratchet head
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench for tightening smaller bolts and access points on the DQ250 transmission. A 3/8" drive is recommended for lower torque values used on the DQ250 transmission.

  • Lower torque range (typically 5-50 Nm)
  • Audible click or digital readout for accurate tightening
  • Reversible ratchet head
Learn more

Socket Set (Metric)

A set of metric sockets in various sizes to fit the different bolt heads on the DQ250 transmission. Including hex and triple square bits.

  • Comprehensive range of sizes (6mm to 24mm)
  • Includes both deep and shallow sockets
  • High-quality chrome vanadium steel
Learn more

Triple Square Bit Set (M8, M10, M12)

Specialized bit set required for several bolts on the DQ250 transmission. These are typically 12 point bits.

  • M8, M10, and M12 sizes for common DQ250 bolts
  • High-strength steel construction
  • Various lengths for access
Learn more

Hex Bit Set

A set of hex bits for use on various bolts on the DQ250 Transmission. Sizes 6,8,10 are used regularly.

  • Standard sizes
  • Hardened steel
Learn more

Universal Joint

A universal joint adapter for accessing bolts in tight or awkward locations on the DQ250 transmission.

  • Allows socket extension
  • Durable construction
Learn more
Service Procedures

Mechatronic Unit Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the mechatronic unit to the DQ250 transmission housing.

  • Locate all mechatronic unit bolts (typically 12-14 bolts)
  • Using the appropriate socket and a torque wrench, tighten the bolts in a criss-cross pattern to the first stage torque spec of 8Nm
  • Tighten all bolts again, in a criss-cross pattern, to the final torque spec of 10Nm + 90 degrees.
  • Verify all bolts are tightened correctly.
View full procedure

Transmission Housing Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the two halves of the DQ250 transmission housing.

  • Locate all transmission housing bolts (typically 12-14 bolts)
  • Using the appropriate triple square bit and a torque wrench, tighten all bolts in a criss-cross pattern to the first stage torque of 40Nm.
  • Tighten all bolts again, in a criss-cross pattern, to the final torque spec of 70Nm.
  • Verify all bolts are tightened correctly.
View full procedure

Differential Housing Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the differential housing to the DQ250 transmission housing.

  • Locate all differential housing bolts (typically 8-10 bolts)
  • Using the appropriate hex bit and a torque wrench, tighten all bolts in a criss-cross pattern to the first stage torque of 20Nm.
  • Tighten all bolts again, in a criss-cross pattern, to the final torque spec of 30Nm.
  • Verify all bolts are tightened correctly.
View full procedure
Technical Service Bulletins

DQ250 Mechatronic Unit Bolt Loosening Issue

2012-05-15

Some 2008-2012 models may experience mechatronic unit bolt loosening due to thermal expansion. This can lead to erratic transmission behavior.

2008-2012

Resolution: Inspect and replace mechatronic unit bolts if necessary. Always use new bolts and follow the correct torque procedure. Apply threadlocker if specified by the OEM bulletin.

DQ250 Transmission Housing Bolt Failure

2014-01-20

Early production units may experience transmission housing bolt failures due to improper heat treatment of bolts. Failure can result in oil leaks or internal damage.

2008-2009

Resolution: Inspect all transmission housing bolts for signs of stress or wear. Replace bolts if suspect. Follow updated torque specification of 40Nm + 70Nm sequence. Apply threadlocker if specified by the OEM bulletin.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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