Volvo Volvo S90 1997-1998 Drivetrain Bolt Torque Specifications & Fastener Values
Volvo Volvo S90 1997-1998

Volvo Volvo S90 1997-1998 Drivetrain Bolt Torque Specifications

Detailed torque specifications for the drivetrain components of the 1997-1998 Volvo S90, including axle bolts, driveshaft bolts, and transmission mounting bolts.

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

Flywheel And Transmission

This subsystem includes components that connect the engine to the transmission and ensure proper alignment and power transfer.

1

Flywheel Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the flywheel is properly aligned before torquing.
2

Transmission Mounting Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the transmission is properly aligned before torquing.
3

Transmission Bellhousing Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the transmission and engine are properly aligned before torquing.
4

Torque Converter Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the torque converter is properly seated before torquing.

Drive Axles And Cv Joints

This subsystem includes components that transfer power from the transmission to the wheels, ensuring smooth operation and alignment.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the axles are properly seated before torquing.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
185 ft-lbs (250 N·m)
Important Notes
Ensure the CV joint is properly seated before torquing.

Driveshaft And Differential

This subsystem includes components that transfer power from the transmission to the differential and axles, ensuring proper alignment and balance.

1

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the driveshaft is properly aligned before torquing.
2

Differential Mounting Bolts

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure the differential is properly aligned before torquing.
3

Rear Axle Hub Bolts

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure the rear axle hubs are properly seated before torquing.

Fluid System Plugs

This subsystem includes plugs that seal the transmission, differential, and transfer case fluid systems, ensuring proper fluid levels and preventing leaks.

1

Transmission Fluid Drain/Fill Plug

M12 x 1.75
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the plug threads are clean and undamaged before torquing.
2

Differential Drain/Fill Plug

M12 x 1.75
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the plug threads are clean and undamaged before torquing.
3

Transfer Case Drain/Fill Plug

M12 x 1.75
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the plug threads are clean and undamaged before torquing.

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 driveshaft bolts on a 1997-1998 Volvo S90?

The driveshaft bolts on a 1997-1998 Volvo S90 should be torqued to 35 Nm (26 lb-ft). Ensure the bolts are clean and free of debris before installation, and use a calibrated torque wrench for accuracy.

Q2

How often should I check the torque on drivetrain components?

It is recommended to check the torque on drivetrain components, such as driveshaft bolts and axle nuts, during routine maintenance or after any drivetrain-related repairs. For example, after replacing a CV joint or driveshaft, recheck the torque after driving 50-100 miles to ensure no loosening has occurred.

Q3

Can I reuse old drivetrain bolts?

Reusing old drivetrain bolts is not recommended unless specified by the manufacturer. Over time, bolts can stretch or weaken, compromising their integrity. Always use new bolts or those explicitly rated for reuse to ensure proper torque and safety.

Q4

What happens if I over-torque drivetrain bolts?

Over-torquing drivetrain bolts can lead to thread stripping, bolt failure, or damage to the component being secured. For example, over-tightening axle nuts can cause bearing damage, leading to premature wear and potential drivetrain failure.

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 for applying specific torque to bolts.

  • Adjustable torque settings
  • Durable construction
Learn more

Socket Set

A set of sockets for various bolt sizes.

  • Multiple socket sizes
  • Durable material
Learn more

Extension Bar

An extension bar for reaching difficult-to-access bolts.

  • Various lengths available
  • Secure connection to sockets
Learn more
Service Procedures

Drivetrain Bolt Torque Application

Detailed steps for applying proper torque to drivetrain bolts.

  • Identify the specific bolt and its torque specification.
  • Set the torque wrench to the specified torque value.
  • Attach the correct socket to the torque wrench.
  • Apply torque to the bolt in a steady and controlled manner.
  • Verify the torque with a torque wrench to ensure accuracy.
View full procedure

Drivetrain Bolt Inspection

Procedure for inspecting drivetrain bolts for proper torque and wear.

  • Visually inspect all drivetrain bolts for signs of wear or damage.
  • Use a torque wrench to check the torque of each bolt.
  • Replace any bolts that do not meet the specified torque or show signs of wear.
  • Re-torque bolts to the specified value if necessary.
  • Document the inspection results for future reference.
View full procedure
Technical Service Bulletins

Drivetrain Bolt Torque Correction

1997-12-15

Bulletin regarding incorrect torque specifications for drivetrain bolts.

1997-1998 Volvo S90

Resolution: Update the torque specifications to the correct values and re-torque the bolts.

Drivetrain Bolt Failure Advisory

1998-03-10

Advisory about potential failure of drivetrain bolts due to improper torque.

1997-1998 Volvo S90

Resolution: Inspect and re-torque all drivetrain bolts according to the updated specifications.

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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