Audi Audi A4 2009-2016 VL381 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi A4 2009-2016

Audi Audi A4 2009-2016 VL381 Transmission Torque Specifications

This page provides detailed torque specifications for the VL381 transmission bolts found in the 2009-2016 Audi A4 (B8) generation. This information is crucial for proper installation and maintenance of the transmission.

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 Mounting

Torque specifications for securing the transmission to the engine block and/or subframe.

1

Transmission Mounting Bolts

M12 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment of transmission before tightening. Final torque in a cross pattern.
2

Differential Mounting Bolts

M12 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
If applicable, tighten these bolts to the same spec as the transmission mount. Final torque in a cross pattern.

Transmission Case

Torque specifications for transmission case bolts.

1

Transmission Case Bolts

M8 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts in a cross pattern. Value is an estimate based on typical case bolt sizes. Ensure case halves are aligned before tightening.

Transmission Oil Pan

Torque specifications for the transmission oil pan and related components.

1

Transmission Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
7.41 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Do not overtighten, as this can damage the aluminum housing or deform the pan. Value is an estimate based on typical oil pan bolt sizes.

Transmission Fluid Plugs

Torque specifications for the transmission drain and fill plugs.

1

Transmission Drain/Fill Plug

M20 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Always use a new crush washer. Do not overtighten.

Transmission Valve Body

Torque specifications for the transmission valve body and related components.

1

Valve Body Mounting Bolts

M6 x 1.0 (Estimated)
Torque Value
7.41 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Value is an estimate based on typical valve body bolt sizes. These bolts secure the valve body to the transmission case. Do not overtighten.

Transmission Mechatronics

Torque specifications for the transmission mechatronics unit mounting bolts.

1

Mechatronics Unit Bolts

M6 x 1.0 (Estimated)
Torque Value
7.41 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Value is an estimate based on typical mechatronics unit bolt sizes. These bolts secure the mechatronics unit to the transmission case. Do not overtighten.

Transmission Sensors

Torque specifications for the Transmission input and output speed sensor mounting bolts

1

Transmission Input Shaft Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
7.41 ft-lbs (10 N·m)
Important Notes
Value is an estimate based on typical sensor bolt sizes. Be careful when tightening to not break the sensor.
2

Transmission Output Shaft Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
7.41 ft-lbs (10 N·m)
Important Notes
Value is an estimate based on typical sensor bolt sizes. Be careful when tightening to not break the sensor.

Transmission Cooler Lines

Torque specifications for the transmission oil cooler line bolts/fittings.

1

Transmission Oil Cooler Line Bolts/Fittings

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Do not overtighten these fittings. Ensure proper seating and alignment before tightening. Value is an estimate based on typical cooler line fitting sizes.

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 crucial for VL381 transmission bolts?

Using the correct torque specification is crucial to ensure proper clamping force, preventing loosening due to vibration or thermal expansion. Over-torquing can damage bolts or threaded components, while under-torquing may lead to leaks, part failure, or potential disengagement of the transmission components. For example, insufficient torque on the valve body bolts can lead to internal fluid leaks and malfunctions in the transmission.

Q2

What happens if I over-torque the VL381 transmission bolts?

Over-torquing can stretch or break the bolt, damage the threads in the transmission case, and crush gaskets or sealing surfaces, potentially leading to leaks. This can require extensive repairs, including replacing the transmission case or valve body. As a real-world example, overtightening the oil pan bolts of a VL381 can easily damage the soft aluminum casting and cause a persistent oil leak.

Q3

What if I don't have a torque wrench and try to tighten the VL381 transmission bolts by feel?

Tightening by feel is not recommended as it's very difficult to achieve accurate torque values and can lead to both under-tightening and over-tightening. In either scenario, component failure is highly likely. Improper torqueing of the transmission pan can cause fluid leaks and ultimately result in transmission failure. Always use a calibrated torque wrench with the specified torque specifications.

Q4

Are the torque specifications for VL381 transmission bolts the same for all 2009-2016 Audi A4 models?

While the VL381 transmission is used in a range of 2009-2016 Audi A4 models, it's vital to refer to the specific repair manual or a reputable database (like ElsaWeb) for your exact model year and engine variant, as subtle variations might exist. For instance, the torque spec for the Mechatronics unit might vary slightly based on the specific sub-model or transmission revision.

Q5

Should I use new bolts when reassembling VL381 transmission components?

While it may not always be mandatory, it is highly recommended to use new bolts for critical components within the VL381 transmission, especially those securing the valve body or the torque converter. These bolts are often torque-to-yield (TTY) and designed for a single use. Using old bolts can lead to inaccurate clamping force and increased failure risk. Always consult your repair manual and always replace 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

A calibrated torque wrench is essential for applying the correct torque to transmission bolts.

  • Ability to measure torque in Newton-meters (Nm)
  • Click-type or digital readout for accurate settings
Learn more

Socket Set

A set of metric sockets is needed to fit the various sizes of bolts on the VL381 transmission.

  • Variety of sizes ranging from 10mm to 19mm
  • 6-point sockets for better grip and reduced risk of stripping
Learn more

Extension Bars

Extension bars allow access to bolts in recessed or hard-to-reach areas of the transmission.

  • Various lengths for different accessibility challenges
  • Strong construction to withstand torque loads
Learn more

Universal Joint

A universal joint adapter allows for angled access to bolts when necessary.

  • Allows for flexibility in tight spaces
  • Durable construction
Learn more
Service Procedures

VL381 Transmission Pan Bolt Torque Procedure

Procedure for tightening the transmission pan bolts on the VL381 transmission.

  • Clean the sealing surfaces of the transmission pan and transmission case.
  • Position the transmission pan with a new gasket in place.
  • Install all pan bolts by hand, ensuring they are evenly distributed.
  • Tighten the bolts in a criss-cross pattern to 10 Nm.
  • Perform a final tightening of bolts to 15 Nm using a calibrated torque wrench.
  • Verify all bolts are tightened to the proper specification.
View full procedure

VL381 Mechatronic Unit Bolt Torque Procedure

Procedure for tightening the bolts securing the Mechatronic unit to the VL381 transmission.

  • Clean all mating surfaces of the mechatronic unit and transmission.
  • Position the mechatronic unit and install all bolts by hand.
  • Tighten the bolts in a criss-cross pattern to 8 Nm initially.
  • Perform a final tightening of bolts to 10 Nm using a torque wrench.
  • Verify all bolts are tightened to the proper specification.
View full procedure

VL381 Transmission Fill Plug Torque Procedure

Procedure for tightening the fill plug on the VL381 transmission.

  • Install the fill plug with a new sealing washer by hand.
  • Tighten the fill plug to 30 Nm using a torque wrench.
View full procedure
Technical Service Bulletins

VL381 Transmission Oil Leakage from Pan

2013-05-15

Some 2009-2012 Audi A4 models may experience transmission oil leaks from the pan due to improper sealing or inadequate torque on pan bolts.

2009-2012 Audi A4

Resolution: Ensure the transmission pan sealing surface is clean and use a new gasket. Torque the pan bolts to 15 Nm, following a criss-cross pattern during tightening.

Mechatronic Unit Bolt Loosening on VL381 Transmissions

2015-02-20

Reports of loose mechatronic unit bolts on some 2012-2016 Audi A4 models, which can cause erratic shifting.

2012-2016 Audi A4

Resolution: Remove and inspect mechatronic unit bolts. Clean the threads and re-install the bolts, tightening to 10 Nm in a criss-cross pattern. If damage or stretching is observed, replace 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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