Audi Audi S5 2007-2016 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi S5 2007-2016

Audi Audi S5 2007-2016 Drivetrain Bolt Torque Specifications

Detailed torque specifications for drivetrain bolts on the 2007-2016 Audi S5 (B8/8T) platform. Includes values for transmission, differential, driveshaft, and axle 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

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Torque Calculator

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Transmission

This section covers torque specifications for various components of both manual and automatic transmissions, including mounting hardware, fluid plugs, and internal components.

1

Transmission Mounting Bolts (Engine to Transmission)

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the transmission to the engine block. Critical for drivetrain stability. Estimated based on similar Audi models and industry standards.
2

Transmission Mounting Bracket Bolts (Frame to Mount)

M10 x 1.5
Important Notes
Secures the transmission mounting bracket to the vehicle's frame. Proper torque ensures the bracket functions correctly. Estimated based on similar Audi models and industry standards.
3

Transmission Fluid Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal for the transmission fluid. Estimated based on similar Audi models and industry standards.
4

Transmission Fluid Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a leak-free seal for the transmission fluid fill port. Estimated based on similar Audi models and industry standards.
5

Manual Transmission Input Shaft Cover

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Provides a seal for the transmission input shaft. Estimated based on small cover and bolt size of typical manual transmission components.
6

Automatic Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the transmission oil pan. Proper torque and tightening sequence are critical to prevent leaks. Estimated based on industry standards for automatic transmission oil pans.
7

Automatic Transmission Mechatronics Unit Bolts

M6 x 1.0
Important Notes
Secures the mechatronics unit inside the transmission. Proper torque is crucial for correct hydraulic operation. Estimated based on industry standards for mechatronics unit attachment.
8

Dual Mass Flywheel Bolts (Manual Transmissions)

M10 x 1.0
Important Notes
Secures the flywheel to the crankshaft. Crucial for proper engine-transmission coupling. Bolts are generally single-use. Estimated based on similar year Audi S5 manual transmission specs and industry standards.
9

Clutch Pressure Plate Bolts (Manual Transmissions)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the clutch pressure plate to the flywheel. Use a cross tightening pattern. Estimated based on similar year Audi S5 manual transmission specs and industry standards.
10

Clutch Slave Cylinder Bolts (Manual Transmissions)

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the slave cylinder. Estimated based on similar year Audi S5/A5 manual transmission specs and industry standards.

Driveshaft

This section outlines torque specifications for driveshaft components, including connections to the transmission and differential, and the center support bearing.

1

Driveshaft to Transmission Flange Bolts (Front/Rear)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the driveshaft to the transmission output flange. Estimated based on similar year Audi S5 and industry standards.
2

Driveshaft to Differential Flange Bolts (Front/Rear)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the driveshaft to the differential input flange. Estimated based on similar year Audi S5 and industry standards.
3

Center Support Bearing Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Secures the driveshaft's center support bearing to the chassis. Estimated based on similar year Audi S5/A5 and industry standards.

Differential

This section provides torque specifications for differential mounting, fluid plugs, and output flange connections for both front and rear differentials.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the differential housing to the vehicle subframe. Estimated based on similar year Audi S5/A5 and industry standards.
2

Differential Fill Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a proper seal for filling the differential with fluid. Estimated based on similar year Audi A5 and industry standards.
3

Differential Drain Plug

M18 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensures a proper seal for draining the differential fluid. Estimated based on similar year Audi A5 and industry standards.
4

Differential Output Flange Bolts (Connecting to Axle Shafts)

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Connects the differential output flanges to the axle shafts. Estimated based on similar year Audi S5/A5 and industry standards.

Axle Shafts

This section details torque specifications for axle shaft components, including CV joint connections to the differential and wheel hub.

1

Axle Shaft Inner CV Joint Bolts (Differential Side)

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Secures the axle shafts to the differential. Estimated based on similar year Audi S5 and industry standards.
2

Axle Shaft Outer CV Joint Bolt/Nut (Wheel Hub Side)

M14 x 1.5
Important Notes
Secures the axle shaft to the wheel hub. This is a critical safety fastener and often single use. Estimated based on industry standards and bolt size.
3

Hub Nut Retaining Bolt (If applicable)

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the retaining bolt on the hub nut. Estimated based on industry standards.

Wheel Hub

This section includes torque specifications for wheel hub to knuckle mounting bolts.

1

Wheel Hub to Knuckle Bolts

M12 x 1.75
Important Notes
Secures the wheel hub to the suspension knuckle. Estimated based on similar year Audi S5/A5 and industry standards.

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?

Correct torque is crucial for the proper function and longevity of drivetrain components. Under-torquing can lead to bolts loosening over time, causing vibrations, component damage, and potential failure. Over-torquing can stretch or break bolts, damage threads, and distort mating surfaces, leading to component failure or leaks. Imagine a differential bolt that is not tightened correctly, it could cause gears to not mesh properly which would lead to damage, noise, or even complete failure of the differential.

Q2

Where can I find the correct torque specifications for my 2007-2016 Audi S5 drivetrain?

The correct torque specifications for your Audi S5 drivetrain bolts can be found in the official Audi repair manual for your specific model year. You might also find this information on reputable online forums dedicated to the S5 or through aftermarket repair information databases such as AllData or Mitchell1. Always cross-reference multiple sources to ensure accuracy. Do not rely solely on 'general' torque specifications, as those often do not account for specific bolt sizes, grades, and materials used in drivetrain applications.

Q3

Do I need special tools to torque drivetrain bolts?

Yes, a torque wrench is essential for tightening drivetrain bolts to the manufacturer's specified torque. A torque wrench allows you to apply and accurately measure the amount of tightening force applied to the bolt. The specific torque wrench will depend on the range of torque specifications you will be applying. Also make sure you are using the correct size and grade of socket for the bolt heads.

Q4

What does it mean to torque a bolt to a specific specification + angle?

Some drivetrain bolts require a torque-to-angle procedure. This means you initially tighten the bolt to a specified torque value and then rotate it an additional number of degrees. This method provides a more precise tightening and is often used with stretch bolts. You’ll need a torque wrench that can measure the initial torque, and an angle gauge to measure the extra degrees of turn. Failing to follow this procedure correctly can cause bolt damage or lead to a loose connection.

Q5

Are there any bolts that need to be replaced rather than reused on the drivetrain?

Yes. Some drivetrain bolts, especially those in high-stress areas (like connecting the driveshaft to the differential), are one-time-use stretch bolts. These bolts are designed to yield (stretch) a specific amount, and they lose their clamping force if reused. Check your service manual to identify these bolts, and always replace them with new, OE-spec or equivalent bolts when servicing the drivetrain.

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 is essential for achieving accurate fastener torque. 1/2 inch drive is suitable for most drivetrain components.

  • Wide torque range (e.g., 20-200 Nm)
  • Click-type or digital display
  • Durable construction
Learn more

Torque Wrench (3/8" drive)

A 3/8 inch drive torque wrench is useful for smaller fasteners and areas with limited space.

  • Lower torque range (e.g., 5-80 Nm)
  • Click-type or digital display
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets covering a range of sizes for various drivetrain bolts.

  • Deep and shallow sockets
  • Variety of sizes (e.g., 8mm to 24mm)
  • 6-point design for secure grip
Learn more

Socket Extension

Used to access fasteners in recessed or hard-to-reach areas.

  • Various lengths available
  • Durable construction
  • Secure connection to sockets
Learn more

Universal Joint

Allows access to fasteners at an angle.

  • Flexible pivot point
  • Robust construction
  • Different drive sizes available
Learn more

Triple Square Bit Set

Required for specific drivetrain bolts, including CV axle bolts and differential bolts.

  • Common sizes needed for Audi applications (e.g., M8, M10, M12, M14, M16)
  • Durable construction
  • Precision machining
Learn more
Service Procedures

Front Axle CV Joint Bolt Replacement

Procedure for replacing the bolts connecting the front drive axles to the transmission and wheel hubs.

  • Raise and safely support the vehicle.
  • Remove the wheel.
  • Remove the old CV joint bolts, note which side they go to.
  • If necessary, remove the axle from the hub or transmission flange.
  • Clean the contact surfaces.
  • Install the new CV joint bolts, starting with the hub side.
  • Tighten the bolts to the specified torque in a criss-cross pattern.
  • Reinstall the wheel.
  • Lower the vehicle.
View full procedure

Rear Differential Fluid Change and Bolt Torque

Procedure for draining and refilling the rear differential fluid, including torque specifications.

  • Raise and safely support the vehicle.
  • Locate the fill and drain plugs.
  • Place a drain pan under the drain plug.
  • Remove the drain plug and allow the old fluid to drain completely.
  • Reinstall the drain plug with a new crush washer and torque to specification.
  • Remove the fill plug.
  • Fill the differential with the specified fluid until it reaches the fill hole level.
  • Reinstall the fill plug with a new crush washer and torque to specification.
  • Lower the vehicle.
View full procedure

Transmission Mount Bolt Replacement

Procedure for replacing the bolts securing the transmission mount to the chassis and transmission.

  • Raise and safely support the vehicle.
  • Support the transmission with a suitable jack.
  • Remove the bolts securing the mount to the chassis.
  • Remove the bolts securing the mount to the transmission.
  • Remove the transmission mount.
  • Install the new transmission mount.
  • Install the bolts securing the mount to the chassis and torque to specifications.
  • Install the bolts securing the mount to the transmission and torque to specifications.
  • Remove the jack.
  • Lower the vehicle.
View full procedure
Technical Service Bulletins

Excessive Drivetrain Vibration at High Speeds

2012-03-15

Some 2007-2012 S5 models may exhibit excessive drivetrain vibration at high speeds. This may be due to improperly torqued propeller shaft bolts.

2007-2012

Resolution: Inspect and retorque all propeller shaft bolts to the specified torque. Replace any damaged bolts and ensure proper installation of the center bearing.

Clicking Noise from Rear Differential During Turns

2014-09-20

Some 2010-2016 S5 models may experience a clicking noise from the rear differential during low-speed turns. This may be related to improperly torqued differential carrier bolts or worn clutches.

2010-2016

Resolution: Inspect and retorque all differential carrier bolts to the specified torque. If the clicking persists, further diagnostic and clutch replacement may be required.

Front CV Joint Bolt Loosening

2015-05-10

Reports of front CV joint bolts loosening or shearing have been noted in some 2012-2015 S5 models due to improper tightening during installation. Replace bolts whenever they are removed. Torque to specifications and use threadlocker.

2012-2015

Resolution: Always replace CV joint bolts. Ensure proper cleaning of contact surfaces, correct torque application (using a calibrated torque wrench), and application of threadlocker. Check all the bolts.

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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