Audi Audi Q7 2005-2015 AL551 Transmission Transmission Torque Specifications & Bolt Torque Values
Audi Audi Q7 2005-2015

Audi Audi Q7 2005-2015 AL551 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the AL551 automatic transmission used in the 2005-2015 Audi Q7. Includes case bolts, pan bolts, valve body bolts, and more.

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 Housing

Torque specifications for bolts related to the main transmission case, including attachments to the engine bellhousing, intermediate plates, and the transmission pan. Proper torque is critical to prevent leaks and maintain structural integrity.

1

Transmission Housing Bolts (Main Case to Bellhousing)

M12 x 1.75
Torque Value
48 ft-lbs (65 N·m)
Important Notes
These bolts are crucial for securing the main transmission housing to the engine bellhousing. Estimated value based on similar applications.
2

Transmission Housing to Intermediate Plate Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
These bolts secure intermediate plates within the transmission housing. Estimated value based on similar applications.
3

Transmission Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts secure the transmission pan. Overtightening can damage the pan gasket/sealer. Always use new gasket or sealant.
4

Transmission Filter Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secure the transmission filter. Estimated value based on similar applications.
5

Transmission Fill Plug

M16 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the fill plug, which must be torqued to prevent leaks. Always use new sealing washer. Estimated value based on similar applications.
6

Transmission Drain Plug

M18 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Secures the drain plug, which must be torqued to prevent leaks. Always use new sealing washer. Estimated value based on similar applications.
7

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Valve body bolts require low torque to prevent warping. Tighten gradually in a criss-cross sequence. Estimated value based on similar applications.
8

Mechatronic Unit Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Mechatronic unit bolts require low torque to prevent damage. Tighten gradually in a criss-cross sequence. Estimated value based on similar applications.

Internal Components

Torque specifications for internal components such as clutch packs, speed sensors, the oil pump, and the park pawl mechanism. Proper torque is vital for reliable transmission operation.

1

Clutch Pack Retaining Bolts/Screws

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Secures clutch pack assemblies. Overtightening can distort the pack assembly. Estimated value based on similar applications.
2

Speed Sensor Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secure the speed sensors. Proper torque is important for consistent sensor readings. Estimated value based on similar applications.
3

Oil Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the transmission oil pump. These bolts are essential for maintaining proper lubrication. Estimated value based on similar applications.
4

Park Pawl Mechanism Mounting Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secure the park pawl mechanism. These bolts require proper torque to ensure it is securely attached. Estimated value based on similar applications.

External Components

Torque specifications for external components such as driveshaft flanges, transmission mounts, and cooler line fittings. These components are critical for vehicle operation and safety.

1

Driveshaft Flange Bolts (Transmission Output)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Connects the transmission output flange to the driveshaft. Always replace these bolts. Estimated value based on similar applications.
2

Transmission Mount Bolts (to Body/Crossmember)

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the transmission to the vehicle's chassis. Proper torque prevents excessive vibration and movement. Estimated value based on similar applications.
3

Transmission Cooler Line Fittings

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secure the cooler lines to the transmission housing. Use new washers where required. 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 is using the correct torque specification critical when working on the AL551 transmission?

Using the correct torque specification for the AL551 transmission bolts is crucial for several reasons. Under-tightening can lead to loose bolts, causing leaks, vibrations, and component failure, potentially leading to significant damage and expensive repairs. Over-tightening can stretch or break bolts, damage threads in the transmission casing, or warp mating surfaces, also leading to leaks and component failure. Correct torque ensures proper clamping force, preventing movement and maintaining a secure, sealed connection, thus preserving the integrity and performance of the transmission.

Q2

What happens if I use incorrect torque specifications?

Using incorrect torque specifications on the AL551 transmission can lead to serious problems. If bolts are under-torqued, they can loosen over time, causing fluid leaks, vibrations, and potential component damage or failure. For example, a loose valve body bolt could lead to erratic shifting and internal transmission damage. Over-torquing can strip threads, damage the bolt itself, and distort transmission components, potentially requiring extensive repairs and replacements. For instance, overtightening a pan bolt could crack the transmission housing leading to a significant leak. It is important to consult a repair manual for correct torque values or seek assistance from a qualified technician.

Q3

Do I need to use new bolts when reassembling the AL551 transmission?

While not always mandatory for every single bolt, it is generally recommended to use new bolts when reassembling critical components of the AL551 transmission, especially if they are torque-to-yield bolts (TTY). These bolts are designed to stretch when tightened, and reusing them can result in incorrect clamping force, leading to leaks, component misalignment and damage. Some bolts like those for the valve body or the transmission pan are recommended for replacement. Always consult the specific repair manual or a qualified technician, as some areas may not require new bolts if they are deemed serviceable.

Q4

Can I use a standard torque wrench, or do I need a specialized tool for the AL551 transmission?

A standard torque wrench that covers the required torque ranges for the AL551 transmission bolts is generally sufficient. However, for precision and tight spaces, a click-type or a digital torque wrench is highly recommended. Some areas might require specialized extensions or adaptors to reach all bolts and fasteners. In some cases, a torque angle gauge might also be needed for torque-to-yield bolts. Always ensure that the torque wrench is calibrated accurately to achieve the correct bolt tension.

Q5

What should I do if I suspect a bolt was over-torqued on the AL551?

If you suspect a bolt on the AL551 was over-torqued, it's crucial to address the situation immediately. Remove the bolt and inspect it for any signs of stretching, thread damage, or deformation. Similarly, inspect the threaded hole in the transmission casing for damage. If damage is found, you may need to repair or replace the affected component. If the bolt shows no visual damage, it is still best practice to replace it with a new one and tighten it to the proper torque specification. Ignoring an over-torqued bolt can lead to leaks or failure down the line.

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 is essential for accurately tightening bolts to the specified torque. A 1/2-inch drive is suitable for most AL551 transmission bolts.

  • Precise torque settings
  • Audible click when desired torque is reached
Learn more

Torque Wrench (3/8-inch drive)

A smaller 3/8-inch drive torque wrench is helpful for accessing tighter areas and for smaller bolts.

  • Precise torque settings
  • More compact than a 1/2-inch drive wrench
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary to fit all bolt heads found on the AL551 transmission.

  • Various sizes
  • 6-point sockets for better grip
Learn more

Socket Extensions

Extensions of various lengths are required to reach recessed bolts.

  • Various lengths
  • Provide access in tight areas
Learn more

Universal Joint/Swivel Adapter

Allows access to bolts at awkward angles.

  • Flexible joint
  • Allows for angled torquing
Learn more
Service Procedures

AL551 Transmission Pan Bolt Tightening

Procedure for tightening the transmission pan bolts after service or fluid change.

  • Clean the mating surfaces of the transmission and pan thoroughly.
  • Install the transmission pan with a new gasket.
  • Install the pan bolts by hand.
  • Tighten the bolts in a criss-cross pattern to 15 Nm (11 ft-lbs) initially.
  • Tighten the bolts in the same criss-cross pattern to the final torque of 22 Nm (16 ft-lbs).
  • Verify all bolts are torqued correctly.
View full procedure

AL551 Valve Body Bolt Tightening

Procedure for correctly tightening the valve body bolts. Requires a specific torque sequence.

  • Clean the valve body mating surface and transmission case thoroughly.
  • Install the valve body and associated components.
  • Install valve body bolts by hand.
  • Tighten the bolts following the specified tightening sequence with 8 Nm (6 ft-lbs) initial torque.
  • Tighten the bolts in the same sequence with 15 Nm (11 ft-lbs) final torque.
  • Verify that all bolts are torqued to spec.
View full procedure

AL551 Mechatronic Unit Bolt Tightening

Procedure for correctly tightening the mechatronic unit bolts.

  • Clean the mating surfaces of the mechatronic unit and transmission case.
  • Install the mechatronic unit into the transmission.
  • Install the mechatronic unit mounting bolts by hand.
  • Tighten bolts to 10 Nm (7 ft-lbs) in a criss-cross pattern.
  • Verify all bolts are torqued correctly.
  • Install mechatronic unit electrical connectors and verify proper operation.
View full procedure
Technical Service Bulletins

AL551 Transmission Pan Leakage Due to Improper Torque

2012-05-10

Reports of transmission pan leaks have been noted, often due to improper tightening of the pan bolts. Insufficient torque can cause leaks and excessive torque can damage the pan or threads.

2005-2010 Audi Q7

Resolution: Ensure all transmission pan bolts are torqued to 22 Nm (16 ft-lbs) using a calibrated torque wrench. Clean all mating surfaces before installation and use a new gasket.

AL551 Valve Body Bolt Breakage

2014-02-21

Some reports indicate valve body bolt breakage has occured due to over-torquing. Ensure the proper torque procedure is used.

2005-2015 Audi Q7

Resolution: Follow the specified tightening sequence and tighten to 15 Nm (11 ft-lbs) final torque. Check for damaged threads prior to installing bolts.

AL551 Mechatronic Unit Connector Issues

2010-11-15

Some reported issues with mechatronic unit connectors due to improper install during reassembly causing intermittent failures. This may or may not be related to bolt torque.

2005-2010 Audi Q7

Resolution: Ensure the mechatronic unit connectors are fully seated and that they 'click' into place prior to closing up the transmission. Verify proper unit operation after reassembly.

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