Volvo Volvo C70 1997-2005 AW55 Transmission Transmission Torque Specifications & Bolt Torque Values
Volvo Volvo C70 1997-2005

Volvo Volvo C70 1997-2005 AW55 Transmission Torque Specifications

Detailed torque specifications for the AW55 transmission bolts in the 1997-2005 Volvo C70. Includes bolt locations, 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

Bolts and components that secure the transmission to the vehicle's chassis, ensuring proper alignment and preventing vibration.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute torque.

Oil Pan

Bolts and components that secure the transmission oil pan to the transmission housing, ensuring a proper seal and preventing leaks.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Over-tightening can warp the oil pan. Ensure even torque application.

Fluid Plugs

Plugs that allow for draining and filling of transmission fluid, ensuring proper sealing and preventing leaks.

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Use a new crush washer to ensure a proper seal.

Drive Axle

Bolts and nuts that secure the drive axles and CV joints to the transmission and wheel hubs, ensuring proper driveline operation.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure proper alignment of the axle before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
195 ft-lbs (265 N·m)
Important Notes
Use a new cotter pin to secure the nut after tightening.

Propeller Shaft

Bolts that secure the drive shaft to the transmission output flange, ensuring proper driveline operation.

1

Propeller/Drive Shaft Bolts

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the drive shaft before tightening.

Starter Motor

Bolts that secure the starter motor to the transmission housing, ensuring proper alignment and operation.

1

Starter Motor Mounting Bolts

M8 x 1.25
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Ensure proper alignment of the starter motor before tightening.

Torque Converter

Bolts that secure the torque converter to the flexplate, ensuring proper alignment and operation.

1

Torque Converter Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the torque converter before tightening.

Bellhousing

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

1

Transmission Bellhousing Bolts

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the bellhousing before tightening.

Shift Linkage

Bolts that secure the shift linkage to the transmission, ensuring proper shifting operation.

1

Transmission Shift Linkage Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the shift linkage before tightening.

Cooler Lines

Fittings that connect the transmission cooler lines to the transmission, ensuring proper fluid flow and sealing.

1

Transmission Cooler Line Fittings

M12 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new O-ring or seal to ensure a proper connection.

Valve Body

Bolts that secure the valve body inside the transmission, ensuring proper hydraulic operation and sealing.

1

Transmission Valve Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Over-tightening can damage the valve body. Ensure even torque application.

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 recommended torque for the AW55 transmission pan bolts?

The recommended torque for the AW55 transmission pan bolts is 8-10 Nm (6-7 lb-ft). Over-tightening can damage the pan or strip the threads, while under-tightening may cause leaks. Always use a torque wrench for precision.

Q2

How often should I check the torque on my AW55 transmission bolts?

It is recommended to check the torque on AW55 transmission bolts during routine maintenance, such as fluid changes or every 30,000 miles. Inspect for leaks or loose bolts, as vibrations over time can cause them to loosen.

Q3

Can I reuse the transmission pan bolts on an AW55 transmission?

Yes, you can reuse the transmission pan bolts on an AW55 transmission, provided they are in good condition and not stripped or damaged. However, some mechanics recommend replacing them with new bolts to ensure proper torque and prevent leaks.

Q4

What happens if I over-torque the AW55 transmission valve body bolts?

Over-torquing the AW55 transmission valve body bolts can damage the valve body, warp the mating surface, or strip the threads. This can lead to improper shifting, fluid leaks, or transmission failure. Always follow the specified torque of 10-12 Nm (7-9 lb-ft).

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
  • Calibrated for accuracy
Learn more

Socket Set

A set of sockets for use with a torque wrench to fit various bolt sizes.

  • Includes metric and standard sizes
  • Durable construction
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent loosening.

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

AW55 Transmission Bolt Torque Specifications

Detailed steps to properly torque the bolts on the AW55 transmission.

  • Ensure the transmission is properly aligned and seated.
  • Clean the bolt threads and apply thread locker if specified.
  • Using a torque wrench, tighten the bolts to the specified torque in a crisscross pattern.
  • Double-check the torque settings to ensure accuracy.
View full procedure

Transmission Fluid Replacement

Procedure for replacing the transmission fluid in the AW55 transmission.

  • Drain the old transmission fluid from the pan.
  • Replace the transmission filter and gasket.
  • Refill with the recommended transmission fluid.
  • Check the fluid level and adjust as necessary.
View full procedure
Technical Service Bulletins

AW55 Transmission Bolt Torque Recall

2003-05-15

A recall affecting certain 1997-2005 Volvo C70 models due to improper bolt torque specifications.

1997-2005 Volvo C70

Resolution: Re-torque the transmission bolts to the correct specifications and inspect for damage.

Transmission Fluid Leak Advisory

2004-08-20

An advisory regarding potential transmission fluid leaks in the AW55 transmission.

1997-2005 Volvo C70

Resolution: Inspect the transmission pan and bolts for leaks and re-torque if necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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