Volvo Volvo C70 2006-2013 AW55 Transmission Transmission Torque Specifications & Bolt Torque Values
Volvo Volvo C70 2006-2013

Volvo Volvo C70 2006-2013 AW55 Transmission Torque Specifications

Detailed torque specifications for the AW55 transmission bolts in the 2006-2013 Volvo C70. Includes bolt types, torque values, and installation tips.

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

Components that secure the transmission to the vehicle's chassis, ensuring stability and alignment during operation.

1

Transmission Mounting Bolts

M10 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening.

Oil Pan

Components that secure the transmission oil pan, ensuring a proper seal to prevent fluid leaks.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Use a new gasket and ensure the sealing surface is clean.

Fluid Plugs

Components that allow for the draining and refilling of transmission fluid, ensuring proper fluid levels and preventing leaks.

1

Transmission Drain Plug

M12 x 1.5
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Use a new crush washer to ensure a proper seal.
2

Transmission Fill Plug

M12 x 1.5
Torque Value
29 ft-lbs (40 N·m)
Important Notes
Ensure the fill plug is properly sealed to prevent leaks.

Drive Axle

Components that secure the drive axles and CV joints to the transmission, ensuring proper power transfer and alignment.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the drive axle before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
170 ft-lbs (230 N·m)
Important Notes
Use a new axle nut to ensure proper torque and security.

Drive Shaft

Components that secure the drive shaft to the transmission, ensuring proper power transfer and alignment.

1

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the drive shaft before tightening.

Torque Converter

Components that secure the torque converter to the flexplate, ensuring proper power transfer and alignment.

1

Torque Converter Bolts

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment of the torque converter before tightening.

Bellhousing

Components that secure the transmission bellhousing to the engine block, ensuring proper alignment and sealing.

1

Transmission Bellhousing Bolts

M10 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Ensure proper alignment of the transmission and engine before tightening.

Valve Body

Components that secure the valve body and solenoids inside the transmission, ensuring proper shifting and operation.

1

Transmission Valve Body Bolts

M6 x 1.0
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Ensure proper alignment of the valve body before tightening.
2

Transmission Solenoid Bolts

M6 x 1.0
Torque Value
5.9 ft-lbs (8 N·m)
Important Notes
Ensure proper alignment of the solenoids before tightening.

Shift Linkage

Components that secure the shift linkage to the transmission, ensuring proper gear selection and operation.

1

Transmission Shift Linkage Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of the shift linkage before tightening.

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

What is the torque specification for the AW55 transmission pan bolts?

The torque specification for the AW55 transmission pan bolts is 10 Nm (7.4 lb-ft). Ensure the pan surface and bolt threads are clean and free of debris before tightening to avoid leaks or damage.

Q2

How often should I check the torque on transmission bolts?

Transmission bolts should be checked during routine maintenance or after any transmission-related repairs. For the AW55 transmission, inspect bolt torque every 30,000 miles or if you notice fluid leaks, unusual noises, or shifting issues.

Q3

Can I reuse the transmission pan gasket on the AW55?

It is not recommended to reuse the transmission pan gasket on the AW55. Always replace it with a new gasket to ensure a proper seal and prevent fluid leaks, which can lead to transmission damage.

Q4

What happens if I over-torque the transmission bolts?

Over-torquing transmission bolts can strip threads, damage the transmission case, or deform the pan, leading to leaks or improper sealing. Always use a calibrated torque wrench and follow manufacturer specifications.

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 precision tool used to apply a specific torque to fasteners.

  • Adjustable torque settings
  • Durable construction for repeated use
Learn more

Socket Set

A set of sockets for various bolt sizes, essential for transmission work.

  • Includes both metric and standard sizes
  • Compatible with torque wrench
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent loosening.

  • High-strength formula
  • Resistant to vibration and temperature changes
Learn more
Service Procedures

AW55 Transmission Bolt Torque Specifications

Detailed steps to ensure proper torque application for the AW55 transmission system.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan to access the bolts.
  • Clean the bolt threads and apply thread locker if recommended.
  • Using a torque wrench, tighten the bolts to the specified torque: 10 Nm (7.4 ft-lb) for small bolts, 25 Nm (18.4 ft-lb) for larger bolts.
  • Reinstall the transmission pan and ensure all bolts are securely tightened.
View full procedure
Technical Service Bulletins

AW55 Transmission Bolt Loosening Issue

2012-05-15

Reports of transmission bolts loosening over time, leading to leaks and performance issues.

2006-2013 Volvo C70

Resolution: Apply thread locker to all transmission bolts during service and ensure proper torque specifications are followed.

AW55 Transmission Fluid Leak

2011-08-22

Some vehicles experience fluid leaks due to improperly torqued transmission bolts.

2006-2013 Volvo C70

Resolution: Inspect and retorque all transmission bolts to the specified values. Replace any damaged bolts or gaskets.

About the Author

Expert automotive knowledge and experience

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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