Audi Audi S3 2013-present Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi S3 2013-present

Audi Audi S3 2013-present Drivetrain Bolt Torque Specifications

Comprehensive guide to drivetrain bolt torque specifications for 2013-Present Audi S3 models (8V and 8Y chassis). Includes values for 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Transmission Dsg

Torque specifications for components of the DSG (Direct Shift Gearbox) or S-Tronic transmission, commonly found in Audi S3 models. These specifications are critical for proper transmission operation and longevity.

1

Transmission Mount Bolts (Engine Side)

M12 x 1.5
Important Notes
These bolts secure the transmission to the engine. Torque to specified value and then angle tighten. Replace bolts if removed.
2

Transmission Mount Bolts (Chassis Side)

M12 x 1.5
Important Notes
These bolts secure the transmission mount to the chassis. Torque to specified value and then angle tighten. Replace bolts if removed.
3

Mechatronic Unit Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the Mechatronic unit to the transmission housing. Do not over-tighten.
4

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts seal the transmission oil pan. Proper torque is crucial for maintaining the seal.
5

Flywheel/Drive Plate Bolts (DSG)

M10 x 1.0
Important Notes
These are critical fasteners connecting the flywheel/drive plate to the engine crankshaft. Replace bolts if removed. Torque to specified value and then angle tighten.
6

Transmission Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal of the transmission drain plug. Use new washer if required.
7

Transmission Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures proper sealing of the transmission fill plug. Use new washer if required.

Transmission Manual

Torque specifications for components of the manual transmission, found in some Audi S3 models. These specifications are critical for proper transmission operation and longevity.

1

Transmission Mount Bolts (Engine Side)

M12 x 1.5
Important Notes
These bolts secure the transmission to the engine. Torque to specified value and then angle tighten. Replace bolts if removed.
2

Transmission Mount Bolts (Chassis Side)

M12 x 1.5
Important Notes
These bolts secure the transmission mount to the chassis. Torque to specified value and then angle tighten. Replace bolts if removed.
3

Flywheel Bolts (Manual)

M10 x 1.0
Important Notes
These are critical fasteners connecting the flywheel to the engine crankshaft. Replace bolts if removed. Torque to specified value and then angle tighten.
4

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the pressure plate to the flywheel. Proper torque ensures consistent clutch operation. Estimated value based on bolt size.
5

Transmission Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal of the transmission drain plug. Use new washer if required.
6

Transmission Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures proper sealing of the transmission fill plug. Use new washer if required.

Driveshafts Axles

Torque specifications for components of the driveshafts and axles, critical for transferring power from the transmission to the wheels.

1

Inner CV Joint Bolts (Transmission Side)

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the inner CV joint to the transmission output flange.
2

Outer CV Joint Bolt (Wheel Side)

M14 x 1.5
Important Notes
This critical bolt secures the axle to the wheel hub. Replace bolt if removed. Torque to specified value and then angle tighten.
3

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the center support bearing. Estimated value based on bolt size.

Rear Differential

Torque specifications for components of the rear differential, found in Quattro-equipped Audi S3 models. These specifications are critical for proper differential operation and longevity.

1

Differential Mount Bolts (Chassis)

M12 x 1.5
Important Notes
These bolts secure the differential to the chassis. Torque to specified value and then angle tighten. Replace bolts if removed.
2

Rear Differential Cover Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the rear differential cover. Proper torque prevents fluid leaks.
3

Rear Differential Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal of the differential drain plug. Use new washer if required.
4

Rear Differential Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures proper sealing of the differential fill plug. Use new washer if required.
5

Driveshaft Bolts (To Rear Diff)

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the driveshaft to the rear differential input flange. Proper torque is crucial for power transfer.

Transfer Case

Torque specifications for components of the transfer case, found in Quattro-equipped Audi S3 models. These specifications are critical for proper transfer case operation and longevity.

1

Transfer Case Mount Bolts (Engine/Transmission)

M12 x 1.5
Important Notes
Secures the transfer case to the engine and or transmission. Torque to specified value and then angle tighten. Replace bolts if removed.
2

Transfer Case Mount Bolts (Chassis)

M12 x 1.5
Important Notes
These bolts secure the transfer case mount to the chassis. Torque to specified value and then angle tighten. Replace bolts if removed.
3

Transfer Case Cover Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the transfer case cover. Proper torque prevents fluid leaks.
4

Transfer Case Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal of the transfer case drain plug. Use new washer if required.
5

Transfer Case Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures proper sealing of the transfer case fill plug. Use new washer if required.

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 specification important?

Using the correct torque specification is crucial for the safe and reliable operation of your Audi S3's drivetrain. Over-tightening can lead to bolt stretching, thread damage, and component failure, while under-tightening can result in bolts loosening, leading to vibrations, noise, and potential part separation. For example, an under-torqued driveshaft bolt could lead to catastrophic failure at high speeds.

Q2

What happens if I don't have a torque wrench?

While it's *highly recommended* to use a calibrated torque wrench for accurate tightening, if you are in an emergency situation, you could use the 'feel' method with a hand wrench. Be aware, this method is highly prone to errors, so it's best to tighten initially to what feels tight, and then back the bolt off a 1/4 turn, which may keep the components on and running in an emergency situation. Ultimately it's recommended to get to a shop ASAP to properly torque the bolts. Do not drive an un-torqued car long-term.

Q3

Should I use thread locker on drivetrain bolts?

It depends on the specific bolt. Many drivetrain components, especially those subject to vibration and rotational forces, require a thread locker to prevent loosening. Refer to the manufacturer's specifications for each bolt. For instance, driveshaft bolts often use a medium-strength thread locker like Loctite 243. Always clean the threads thoroughly before applying thread locker. Example: If a bolt specification calls for Loctite 243, do not use Loctite 271, or a similar high strength thread locker.

Q4

What is the proper procedure for tightening multiple bolts on a component?

When tightening multiple bolts, follow a star pattern or cross-pattern to ensure even pressure distribution. Tighten the bolts in stages, starting with a lower torque value and gradually working up to the final specification. For example, when bolting the rear differential to the chassis, you'd first snug all bolts in the star pattern, then torque to 25 Nm, then to 50 Nm. This helps prevent warping and uneven stress on the component.

Q5

How often should I check the torque on my drivetrain bolts?

It's a good practice to check the torque on critical drivetrain bolts periodically, especially after significant work or track use. Refer to your vehicle’s service schedule for specific recommendations. A general guideline would be to check after initial install or repair and after 1000-2000 miles. If you’re frequently tracking the vehicle, you may want to perform frequent checks after every track day.

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 with a 1/2" drive is essential for accurately tightening drivetrain bolts to the specified torque.

  • Wide torque range (e.g., 20-200 Nm)
  • Audible click mechanism
  • Accuracy within +/- 3%
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench with a 3/8" drive is useful for smaller or lower torque bolts.

  • Suitable for smaller bolts (e.g. 5-50 Nm)
  • Audible click mechanism
  • Accuracy within +/- 3%
Learn more

Socket Set (1/2" and 3/8" Drive)

A comprehensive set of sockets in both 1/2" and 3/8" drives, including various metric sizes, is needed for different drivetrain bolts.

  • Metric sizes ranging from 8mm to 24mm
  • 6-point design for secure grip
  • Chrome Vanadium steel for durability
Learn more

Extension Bars (1/2" and 3/8" Drive)

Extension bars of various lengths will allow easier access to drivetrain bolts located in hard-to-reach areas.

  • Available in different lengths
  • Durable metal construction
  • Compatible with 1/2" and 3/8" drive
Learn more

Universal Joint (1/2" and 3/8" Drive)

A universal joint can be used when the socket cannot be directly aligned with the bolt head, aiding in access to bolts at angles.

  • Allows for angular application of torque
  • Durable construction
  • Compatible with 1/2" and 3/8" drive
Learn more

Hex Bit (Allen) Socket Set

A set of hex bits (allen keys) with socket attachments are necessary for bolts that have hex head.

  • Metric sizes ranging from 4mm to 12mm
  • 6-point design for secure grip
  • Chrome Vanadium steel for durability
Learn more

Threadlocker (Medium Strength)

Medium strength threadlocker is recommended for bolts that are prone to loosening due to vibration or repeated thermal cycles.

  • Prevents loosening of fasteners
  • Suitable for general use
  • Temperature resistant
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure details how to properly torque the bolts securing the driveshaft to the transmission and rear differential.

  • 1. Identify all bolts on the driveshaft connection points.
  • 2. Clean bolt threads using a wire brush.
  • 3. Apply a small amount of medium strength threadlocker to the bolt threads (if recommended).
  • 4. Tighten bolts in a star pattern (or specified pattern) to the first specified torque.
  • 5. Tighten the same bolts again using the final specified torque.
  • 6. Ensure all bolts are torqued to specifications with a calibrated torque wrench.
View full procedure

Transmission Mount Bolt Torque Procedure

This procedure outlines the process for properly torquing the bolts that secure the transmission mount to the chassis and transmission.

  • 1. Locate the transmission mount bolts.
  • 2. Clean bolt threads using a wire brush.
  • 3. Apply a small amount of medium strength threadlocker to the bolt threads (if recommended).
  • 4. Tighten all transmission mount bolts to the specified torque. Verify the required torque specifications.
  • 5. Double-check all bolts for proper torque.
View full procedure

Rear Differential Mount Bolt Torque Procedure

This procedure describes the proper technique for tightening the bolts securing the rear differential to the chassis.

  • 1. Identify the rear differential mount bolts.
  • 2. Clean bolt threads using a wire brush.
  • 3. Apply a small amount of medium strength threadlocker to the bolt threads (if recommended).
  • 4. Tighten all rear differential mount bolts to the specified torque using a calibrated torque wrench.
  • 5. Verify all bolts are tightened to spec.
View full procedure

Wheel Bearing/Hub Assembly Bolt Torque Procedure

This procedure outlines the process for properly torquing the bolts or nut that secures the wheel bearing/hub assembly to the axle.

  • 1. Locate the wheel bearing/hub assembly bolts.
  • 2. Clean bolt threads using a wire brush.
  • 3. Apply a small amount of medium strength threadlocker to the bolt threads (if recommended).
  • 4. Tighten all wheel bearing/hub bolts/nut to the specified torque using a calibrated torque wrench. Verify the required torque specifications.
  • 5. Double-check all bolts/nut for proper torque.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2017-05-15

Some 2013-2016 Audi S3 models have reported driveshaft bolt loosening after extended driving due to thermal expansion and vibration.

2013-2016

Resolution: Replace all driveshaft bolts with new, and apply medium strength threadlocker. Torque to the specified value and re-check after 50 miles.

Transmission Mount Bolt Stretch

2019-01-10

A small number of 2015-2018 S3 models have experienced transmission mount bolt stretching when subjected to high loads. Always replace bolts when removed.

2015-2018

Resolution: Replace transmission mount bolts with new bolts when performing any service involving the transmission mount. Use the correct torque specified, do not over-torque bolts.

Rear Differential Mount Bolt Corrosion

2021-11-22

Vehicles in areas with high exposure to road salt or other corrosive elements may experience premature corrosion of the rear differential mounting bolts. Inspection is recommended.

2013-2021

Resolution: Inspect rear differential mounting bolts for any signs of corrosion. Replace bolts if corrosion is found, and apply a corrosion preventative during reassembly. Use the correct torque specifications.

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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