Audi Audi S7 2012-2018 Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi S7 2012-2018

Audi Audi S7 2012-2018 Drivetrain Bolt Torque Specifications

Comprehensive list of drivetrain bolt torque specifications for the 2012-2018 Audi S7 (C7) platform. Includes torque values for transmission, differential, and driveshaft 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

Torque specifications for the 7-speed S-Tronic DL501 automatic transmission found in the 2012-2018 Audi S7. Includes oil pan, mounts, mechatronics unit, bellhousing, drain/fill plugs, and driveshaft flange connections.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Secures the transmission oil pan to the transmission case. Over-tightening can deform the pan and cause leaks. Estimated value based on similar applications.
2

Transmission Mount Bolts (to Transmission Case)

M12 x 1.75
Important Notes
Secures the transmission to the vehicle's chassis through the mount. The angle torque is critical for proper clamping force. Estimated value based on similar applications.
3

Transmission Mount Bolts (to Chassis)

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the transmission mount to the chassis. Estimated value based on similar applications.
4

Mechatronics Unit Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secures the mechatronics unit. Correct torque is critical for proper sealing. Estimated value based on similar applications.
5

Transmission Bellhousing Bolts (Engine to Transmission)

M12 x 1.5
Important Notes
Connects the transmission to the engine block. The angle torque ensures proper clamping. Estimated value based on similar applications.
6

Transmission Fluid Drain Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission case at the fluid drain location. Over-tightening can damage the plug or case. Estimated value based on similar applications.
7

Transmission Fill Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the transmission case at the fluid fill location. Over-tightening can damage the plug or case. Estimated value based on similar applications.
8

Driveshaft Bolts (Transmission Flange to Driveshaft)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the driveshaft to the output flange of the transmission. Estimated value based on similar applications.

Driveshaft

Torque specifications for the driveshaft components, including the center support bearing and connections to the front and rear differentials.

1

Center Support Bearing Bolts (to Chassis)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the driveshaft center support bearing to the chassis. Estimated value based on similar applications.
2

Driveshaft Bolts (Front Differential Flange to Driveshaft)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the front end of the driveshaft to the input flange of the front differential. Estimated value based on similar applications.
3

Driveshaft Bolts (Rear Differential Flange to Driveshaft)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the rear end of the driveshaft to the input flange of the rear differential. Estimated value based on similar applications.

Front Differential

Torque specifications for the front differential housing, mounts, drain/fill plugs, and output flange connections.

1

Differential Housing Bolts (to Transmission)

M12 x 1.75
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Secures the front differential to the transmission case. Estimated value based on similar applications.
2

Differential Mount Bolts (to Subframe)

M12 x 1.75
Important Notes
Secures the front differential to the vehicle's subframe. The angle torque is important for proper clamping. Estimated value based on similar applications.
3

Differential Drain Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the differential housing at the fluid drain location. Estimated value based on similar applications.
4

Differential Fill Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the differential housing at the fluid fill location. Estimated value based on similar applications.
5

Output Flange Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Fastens the output flanges of the differential to the drive shafts. Estimated value based on similar applications.

Rear Differential

Torque specifications for the rear differential housing, mounts, drain/fill plugs, and output flange connections.

1

Differential Housing Bolts (to Subframe)

M12 x 1.75
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Secures the rear differential to the vehicle's subframe. Estimated value based on similar applications.
2

Differential Mount Bolts (to Chassis)

M12 x 1.75
Important Notes
Connects the differential mount to the chassis. The angle torque is important for proper clamping. Estimated value based on similar applications.
3

Differential Drain Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the differential housing at the fluid drain location. Estimated value based on similar applications.
4

Differential Fill Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Seals the differential housing at the fluid fill location. Estimated value based on similar applications.
5

Output Flange Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Fastens the output flanges of the differential to the drive shafts. Estimated value based on similar applications.

Axles

Torque specifications for the axle components, including the inner and outer CV joint bolts.

1

Inner CV Joint Bolts (to Differential Flange)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the inner CV joint to the differential output flange. Estimated value based on similar applications.
2

Outer CV Joint Bolts (to Wheel Hub)

M10 x 1.5
Important Notes
Secures the outer CV joint to the wheel hub. The angle torque is crucial for these bolts. Estimated value based on similar applications.

Wheel Hubs

Torque specifications for the front and rear wheel hub nuts.

1

Wheel Hub Nut (Front)

M24 x 1.5
Important Notes
Secures the front wheel hub to the wheel bearing assembly. The angle torque is essential. Estimated value based on similar applications.
2

Wheel Hub Nut (Rear)

M24 x 1.5
Important Notes
Secures the rear wheel hub to the wheel bearing assembly. The angle torque is essential. Estimated value based on similar applications.

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 accurate torque specifications important for drivetrain bolts?

Accurate torque specifications ensure proper clamping force, preventing bolts from loosening due to vibration or stress. Under-torquing can lead to component failure, while over-torquing can stretch or break bolts, potentially causing significant damage to the drivetrain. For example, improper torque on a driveshaft bolt could lead to vibrations or even separation at high speeds.

Q2

Should I replace drivetrain bolts every time they are removed?

It's generally recommended to replace critical drivetrain bolts, especially those subject to high stress or torque-to-yield specifications. These bolts are designed to stretch slightly when properly torqued and may not maintain their clamping force if reused. Examples include driveshaft bolts, differential mounting bolts, and transmission support bolts. Always refer to the Audi service manual for specific recommendations.

Q3

What type of lubricant should I use on drivetrain bolts?

Unless otherwise specified by Audi, it's generally recommended to use clean, dry threads for most drivetrain bolts. However, some applications may require specific thread lubricants or anti-seize compounds to ensure accurate torque readings, prevent corrosion, or assist with proper clamping force. Always refer to the Audi service manual for specific lubrication instructions.

Q4

Can I use a general torque wrench or should I get a specific one for my Audi S7?

A quality torque wrench calibrated to the required torque range is essential. A general torque wrench *can* work if it meets the necessary accuracy and range requirements. However, some drivetrain bolts require high torque values, necessitating a higher-capacity torque wrench. Using an incorrectly calibrated or inappropriate torque wrench could lead to incorrect tightening and potential issues, so ensuring your tool is suited for the application is important.

Q5

What is the difference between torque-to-yield and standard torque specifications?

Standard torque specifications involve tightening a bolt to a specific torque value. Torque-to-yield (TTY) bolts are designed to stretch past their elastic limit when tightened. They require both a torque value *and* an additional angle of rotation after the initial torque is reached. TTY bolts must be replaced after each use. Many drivetrain components, like driveshaft bolts, use TTY bolts.

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 applying accurate torque to larger drivetrain bolts.

  • Wide torque range (e.g., 20-200 ft-lbs)
  • Click-type mechanism for accurate torque application
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench with a 3/8" drive is necessary for smaller drivetrain bolts.

  • Torque range suited for smaller fasteners (e.g., 5-80 ft-lbs)
  • Click-type mechanism for accurate torque application
  • Compact size for access in tight spaces
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including various sizes and depths, to fit all the different bolts in the drivetrain.

  • Variety of sizes (e.g., 8mm - 24mm)
  • 6-point sockets for better grip
  • Deep sockets for extended reach
Learn more

Extension Bars

Extension bars of varying lengths are needed to access recessed bolts within the drivetrain.

  • Various lengths for different access needs
  • Durable material to withstand torque forces
  • 1/2" and 3/8" drive options
Learn more

Universal Joint

A universal joint adapter allows for torque application at an angle, helpful in hard to reach areas.

  • Durable material for lasting torque transfer
  • Smooth rotation to work at multiple angles
  • Compatible with 1/2" and 3/8" drive
Learn more
Service Procedures

Front Driveshaft Bolt Torque Procedure

Procedure to tighten the front driveshaft bolts to manufacturer specifications on 2012-2018 Audi S7.

  • 1. Identify the correct bolts for the front driveshaft to the transmission and front differential.
  • 2. Clean the bolts and threads before installation or reinstallation.
  • 3. Begin by hand tightening all bolts.
  • 4. Tighten all bolts to 40Nm.
  • 5. Tighten all bolts to 90Nm + 90 degrees using torque angle meter.
  • 6. Verify all bolts are torqued correctly.
View full procedure

Rear Driveshaft Bolt Torque Procedure

Procedure to tighten the rear driveshaft bolts to manufacturer specifications on 2012-2018 Audi S7.

  • 1. Identify the correct bolts for the rear driveshaft to the transmission and rear differential.
  • 2. Clean the bolts and threads before installation or reinstallation.
  • 3. Begin by hand tightening all bolts.
  • 4. Tighten all bolts to 40Nm.
  • 5. Tighten all bolts to 90Nm + 90 degrees using torque angle meter.
  • 6. Verify all bolts are torqued correctly.
View full procedure

Rear Differential Mounting Bolt Torque Procedure

Procedure to tighten the rear differential mounting bolts to manufacturer specifications on 2012-2018 Audi S7.

  • 1. Identify the correct bolts for the rear differential mounting.
  • 2. Clean the bolts and threads before installation or reinstallation.
  • 3. Begin by hand tightening all bolts.
  • 4. Tighten all bolts to 100Nm + 90 degrees using torque angle meter.
  • 5. Verify all bolts are torqued correctly.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2016-05-15

Some 2012-2016 S7 vehicles have reported instances of driveshaft bolts loosening over time due to improper factory torque application. This can result in vibrations and noise.

2012-2016

Resolution: Inspect all driveshaft bolts. If bolts are found to be loose, replace them with new bolts and torque to the specified values (40Nm + 90Nm + 90 Degrees using Torque Angle Meter) following correct procedure.

Rear Differential Mounting Bolt Failure

2017-11-20

Reports of rear differential mounting bolt failures have been received on 2015-2018 S7 vehicles. This is likely due to improper torque during the manufacturing process, or prior service. The bolts should be inspected for any cracks and torqued.

2015-2018

Resolution: Inspect all rear differential mounting bolts. If bolts are cracked or show signs of wear replace them with new ones, and torque to the specified values (100Nm + 90 degrees using Torque Angle Meter).

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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