Audi Audi TT 2014-present Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi TT 2014-present

Audi Audi TT 2014-present Drivetrain Bolt Torque Specifications

Comprehensive guide to drivetrain bolt torque specifications for the 2014-present Audi TT, including transmission, driveshaft, and differential components. Provides correct torque values for safe and reliable repairs and maintenance.

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

Torque specifications for various components of the manual and DSG transmissions used in the Audi TT.

1

Transmission Housing Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the transmission case halves together. Critical for preventing leaks and maintaining structural integrity. Estimated based on similar model specifications.
2

Transmission to Engine Bolts (M10)

M10 x 1.5
Important Notes
Connects the transmission to the engine block. Critical for alignment and power transfer. These are often stretch bolts requiring the 90-degree final turn. Estimated based on similar model specifications. **Safety-Critical Fastener**
3

Transmission to Engine Bolts (M12)

M12 x 1.75
Important Notes
Connects the transmission to the engine block. Critical for alignment and power transfer. These are often stretch bolts requiring the 90-degree final turn. Estimated based on similar model specifications. **Safety-Critical Fastener**
4

Transmission Mount Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission to the chassis. Crucial for vibration dampening and proper alignment. Estimated based on similar model specifications.
5

Flywheel/Flexplate Bolts (M10)

M10 x 1.5
Important Notes
Connects the flywheel (manual) or flexplate (DSG) to the crankshaft. These are typically stretch bolts. Essential for transmitting engine power. **Use NEW BOLTS always.** Estimated based on similar model specifications. **Safety-Critical Fastener**
6

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Attaches the clutch pressure plate to the flywheel. Important for even pressure and proper clutch engagement. Estimated based on similar model specifications.
7

DSG Mechatronic Unit Bolts

M6 x 1
Important Notes
Secure the mechatronic unit to the DSG transmission case. This must be correctly torqued and sequence followed to ensure proper internal functioning. These are often stretch bolts requiring the 90-degree final turn. Estimated based on similar hydraulic units. **Safety-Critical Fastener**
8

DSG Transmission Oil Pan Bolts

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the oil pan to the transmission case; essential for preventing oil leaks. Estimated based on similar model specifications.
9

Differential to Transmission Case Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the differential housing to the transmission case. Important for secure and aligned driveline components. Estimated, based on similar component size and torque.
10

Shift Linkage Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Connects shift cables/linkages to the transmission. Correct torque is crucial for accurate shifting. Estimated based on similar model specifications.

Driveshaft Axles

Torque specifications for components related to the driveshafts and axles.

1

Inner CV Joint Bolts to Transmission Flange

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secure the inner CV joint to the transmission output flange. Critical for transmitting power to the wheels. Estimated based on industry standard for M8 bolts in high-stress applications. **Safety-Critical Fastener**
2

Outer CV Joint Bolts to Wheel Hub

M10 x 1.5
Important Notes
Fasten the outer CV joint to the wheel hub assembly. These are critical for wheel drive and are often stretch bolts. **Use NEW BOLTS always.** Estimated based on similar model specifications. **Safety-Critical Fastener**
3

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the center support bearing to the chassis. Crucial for driveshaft alignment. Estimated, based on common size and function.
4

Driveshaft Flange Bolts

M10 x 1.5
Torque Value
40 ft-lbs (55 N·m)
Important Notes
Connects various drive shaft sections. Important for smooth operation and proper driveline alignment. Estimated, based on typical size and torque values for flange bolts.

Rear Differential

Torque specifications for components of the rear differential used in AWD models.

1

Rear Differential Housing Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the differential case together, important for structural integrity and oil containment. Estimated based on similar model specifications.
2

Rear Differential Mount Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the differential to the chassis. Important for controlling differential movement and vibration. Estimated based on similar model specifications.
3

Rear Differential Input Flange Bolts

M10 x 1.5
Torque Value
40 ft-lbs (55 N·m)
Important Notes
Connects the driveshaft to the rear differential. Estimated, based on similar bolt size and torque requirements.
4

Rear Differential Output Flange Bolts (to Axle)

M10 x 1.5
Important Notes
Connects the rear axle shafts to the rear differential. These are often stretch bolts. **Use NEW BOLTS always.** Estimated based on similar model specifications. **Safety-Critical Fastener**
5

Rear Differential Oil Drain/Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a secure seal for the differential oil. Industry standard for drain/fill plugs.

Haldex Coupling

Torque specifications for components of the Haldex coupling used in Quattro (AWD) models.

1

Haldex Coupling Housing Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the Haldex coupling housing. Estimated based on similar model specifications.
2

Haldex Unit Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the Haldex unit to the differential or body. Important for proper engagement. Estimated, based on comparable units and bolt sizes.
3

Haldex Pump Mounting Bolts

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the Haldex pump to the housing. Estimated, based on comparable units and bolt sizes.
4

Haldex Filter Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Important for sealing the filter. Industry Standard for fill/drain 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 specific torque specifications important for drivetrain bolts?

Drivetrain components, such as the transmission, driveshaft, and differential, require precise torque settings for their bolts. Under-tightening can lead to component loosening, vibrations, and even failure, while over-tightening can damage threads, stretch bolts beyond their yield point, and reduce their clamping force. This can result in catastrophic failure. Precise torque ensures that bolts provide the correct clamping force, maintaining the structural integrity of the drivetrain under various operating conditions and loads.

Q2

What type of torque wrench should I use for drivetrain bolt tightening?

A calibrated click-type torque wrench is highly recommended. For lower torque values, a smaller 1/4" or 3/8" drive wrench might be suitable, whereas a 1/2" drive is necessary for higher torques found on components like the driveshaft or differential. Digital torque wrenches offer higher precision and should be considered for critical components and instances where exact torque is paramount. Ensure the torque wrench is within its calibrated range for accurate readings.

Q3

Do I need to replace drivetrain bolts after removal, or can I reuse them?

Certain drivetrain bolts, especially those subjected to high stress, are designed as 'torque-to-yield' (TTY) bolts. These bolts are designed to stretch slightly when tightened to their specification, creating a clamping force and are intended for one time use only. These must be replaced every time they are loosened. Examples can include driveshaft to transmission flange bolts or differential mounting bolts. Consult the repair manual and always replace TTY bolts. Some non-TTY bolts may be reusable, but should be carefully inspected for stretching, damage, or corrosion and replaced if there are any concerns.

Q4

What does 'Nm' and 'lb-ft' stand for in torque specifications?

'Nm' stands for Newton-meters, which is the standard unit of torque in the metric system. 'lb-ft' stands for pound-feet, which is a unit of torque commonly used in the United States. Torque is a measure of rotational force. To convert lb-ft to Nm, you can multiply by 1.356. Understanding both units is essential when referencing service manuals from different regions.

Q5

What is the proper tightening sequence for drivetrain components?

Following the correct tightening sequence is vital to avoid warping or uneven clamping. For components such as differential covers or driveshaft flanges, a star pattern or alternating sequence is generally recommended. Always tighten bolts in multiple stages, gradually approaching the final torque value to allow even distribution of force. Refer to the repair manual for the specific tightening sequence instructions to guarantee proper operation and reduce the likelihood of leaks or failures. Example: tightening a diff cover, begin in the center with minimal torque, then work your way out in a star pattern in incremental steps until you reach the final torque value.

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 drivetrain bolts to their specified torque values. This range is commonly used for larger drivetrain components.

  • Wide torque range (typically 20-150 ft-lbs or equivalent)
  • Click-type or digital readout for accuracy
  • Durable construction
Learn more

Torque Wrench (3/8 inch Drive)

A calibrated torque wrench with a 3/8 inch drive is necessary for smaller bolts and fasteners in the drivetrain system that require lower torque settings.

  • Lower torque range (typically 5-80 ft-lbs or equivalent)
  • Click-type or digital readout for accuracy
  • Compact design for access in tight spaces
Learn more

Socket Set (Metric)

A comprehensive metric socket set is essential for accessing and tightening various drivetrain bolts. Ensure the set includes sizes suitable for bolts in the drivetrain system, particularly those mentioned in the torque specifications.

  • Variety of sizes (8mm - 24mm recommended)
  • 6-point design for secure grip
  • Durable construction
Learn more

Extension Bars

Various length extension bars will help access bolts in recessed areas. Drivetrain components often are difficult to reach.

  • Various lengths (3-10 inches)
  • Durable construction
  • Various drive sizes (1/2 and 3/8)
Learn more

Universal Joints

Universal joints help access bolts that are at odd angles. Some drivetrain components are located in tight spaces.

  • 1/2 inch and 3/8 inch drive options
  • Durable construction
  • Multiple swivel angle options
Learn more

Torx Socket Set

A comprehensive torx socket set will be required to access torx specific drivetrain fasteners.

  • Variety of sizes (T20-T60 recommended)
  • Durable construction
  • Various Drive Sizes (1/2 and 3/8)
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure outlines the steps for proper removal and torque application of driveshaft bolts on the 2014-Present Audi TT.

  • 1. Locate the driveshaft bolts connecting to the transmission and differential.
  • 2. Loosen the bolts using the appropriate socket.
  • 3. Remove the bolts and carefully detach the driveshaft.
  • 4. Install new bolts (always recommended) and hand-tighten.
  • 5. Using a calibrated torque wrench and the appropriate socket, tighten the bolts to the specified torque value, typically 40-45 Nm + 90 degrees, check current repair manual or resource
  • 6. Double-check the torque on each bolt.
View full procedure

Differential Mounting Bolt Torque Procedure

This procedure outlines the steps for proper removal and torque application of differential mounting bolts on the 2014-Present Audi TT.

  • 1. Locate the differential mounting bolts that secure the differential to the chassis.
  • 2. Loosen all the bolts using the appropriate socket, using an extension bar if needed.
  • 3. Remove the bolts and lower the differential (if necessary).
  • 4. Install new bolts (always recommended) and hand-tighten.
  • 5. Using a calibrated torque wrench and the appropriate socket, tighten the bolts to the specified torque value, typically 50 Nm + 90 degrees, check current repair manual or resource.
  • 6. Double-check the torque on each bolt.
  • 7. Always use the specified torque procedure, sometimes this includes tightening them in multiple passes.
View full procedure

Transmission Mount Bolt Torque Procedure

This procedure outlines the steps for proper removal and torque application of transmission mount bolts on the 2014-Present Audi TT.

  • 1. Locate the transmission mount bolts securing the transmission to the chassis.
  • 2. Loosen all the bolts using the appropriate socket.
  • 3. Remove the bolts and carefully support the transmission if needed.
  • 4. Install new bolts (always recommended) and hand-tighten.
  • 5. Using a calibrated torque wrench and the appropriate socket, tighten the bolts to the specified torque value, typically 40 Nm + 90 degrees, check current repair manual or resource.
  • 6. Double-check the torque on each bolt.
  • 7. Always use the specified torque procedure, sometimes this includes tightening them in multiple passes.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2018-07-15

Technical bulletin regarding reports of driveshaft bolt loosening on 2014-2017 Audi TT models. This issue has been linked to improper torque application.

2014-2017

Resolution: Verify the driveshaft bolts are torqued to the correct specification (40-45Nm + 90 degrees) and always use new bolts. Apply a thread-locking compound as an extra precaution.

Differential Mounting Bolt Noise

2020-03-10

Technical bulletin regarding differential mounting bolts making a clunking noise when driving, mostly reported on 2016-2019 Audi TT models.

2016-2019

Resolution: Inspect differential mounting bolts. Ensure bolts are properly torqued to 50 Nm + 90 degrees using the specified torque procedure, often needing several passes. Check rubber mounts and bushings for wear.

Transmission Mount Bolt Fatigue

2022-01-22

Technical bulletin regarding cracked transmission mounting bolts on Audi TT models with high mileage. Bolts may stretch and fatigue, especially on modified vehicles.

2014-2022

Resolution: Replace all transmission mounting bolts when servicing the drivetrain. Torque bolts to the specified 40 Nm + 90 degrees. Check mounts and replace if damaged.

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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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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