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

Volvo Volvo S90 1997-1998 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 1997-1998 Volvo S90, ensuring proper tightening for safety and performance.

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

Front suspension

Components that make up the front suspension system, including struts, control arms, and steering components.

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Value
33 ft-lbs (45 N·m)
2

Control Arm Bolts

M16 x 1.5
Torque Value
74 ft-lbs (100 N·m)
3

Upper Control Arm Bushing Bolts

M12 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Actual torque specification may vary depending on the manufacturer's recommendations.
4

Lower Control Arm Bushing Bolts

M12 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Actual torque specification may vary depending on the manufacturer's recommendations.

Steering system

Components that make up the steering system, including the steering gear, tie rod ends, and sway bar links.

1

Ball Joint Nut

M18 x 1.5
Torque Value
52 ft-lbs (70 N·m)
2

Tie Rod End Nut

M16 x 1.5
Torque Value
37 ft-lbs (50 N·m)
3

Sway Bar Link Nut

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
4

Steering Gear/Rack Bolts

M16 x 1.5
Torque Value
74 ft-lbs (100 N·m)

Stabilizer bar and coil spring

Components that make up the stabilizer bar and coil spring system, including the stabilizer bar mounting bolts and coil spring mounting bolts.

1

Stabilizer Bar Mounting Bolts

M14 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Actual torque specification may vary depending on the manufacturer's recommendations.
2

Coil Spring Mounting Bolts

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Actual torque specification may vary depending on the manufacturer's recommendations.

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 are the torque specifications for the suspension bolts on a 1997-1998 Volvo S90?

The torque specifications vary by component. For example, the front lower control arm bolts should be torqued to 81-101 lb-ft, while the rear shock absorber upper mount bolts require 15-22 lb-ft. Always refer to the vehicle's service manual for precise values.

Q2

Why is it important to use a torque wrench for suspension components?

Using a torque wrench ensures bolts are tightened to the manufacturer’s specifications, preventing over-tightening (which can strip threads or damage components) or under-tightening (which can lead to loosening and potential failure). Suspension components are critical for safety, so precision is essential.

Q3

How often should I check the torque on suspension bolts?

Check the torque during routine maintenance or after any suspension work. If you notice unusual noises, vibrations, or handling issues, inspect the bolts immediately. Loose suspension bolts can compromise vehicle safety.

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 suspension bolts.

  • Adjustable torque settings
  • Calibration certificate included
Learn more

Socket Set

A set of sockets compatible with suspension bolt sizes.

  • Metric sizes included
  • Durable steel construction
Learn more

Breaker Bar

A long-handled tool for loosening tight suspension bolts.

  • High torque application
  • Ergonomic grip
Learn more
Service Procedures

Front Suspension Bolt Torque Application

Step-by-step guide for torquing front suspension bolts on a 1997-1998 Volvo S90.

  • Raise the vehicle on a lift or jack stands.
  • Remove the front wheels to access suspension components.
  • Use a torque wrench to apply specified torque to lower control arm bolts (80-100 Nm).
  • Torque the strut-to-knuckle bolts to 90-110 Nm.
  • Reinstall the wheels and lower the vehicle.
View full procedure

Rear Suspension Bolt Torque Application

Step-by-step guide for torquing rear suspension bolts on a 1997-1998 Volvo S90.

  • Raise the vehicle on a lift or jack stands.
  • Remove the rear wheels to access suspension components.
  • Torque the rear trailing arm bolts to 120-140 Nm.
  • Apply specified torque to the shock absorber mounting bolts (70-90 Nm).
  • Reinstall the wheels and lower the vehicle.
View full procedure
Technical Service Bulletins

Suspension Bolt Rust and Corrosion

1998-05-15

Identifies issues with rust and corrosion on suspension bolts for certain Volvo models.

1997-1998 Volvo S90

Resolution: Replace corroded bolts and apply anti-seize compound during reinstallation.

Incorrect Suspension Torque Specifications

1997-11-20

Reports discrepancies in suspension bolt torque specifications in early service manuals.

1997 Volvo S90

Resolution: Verify torque specifications with updated service documentation before application.

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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