Cadillac DeVille 1985-1993 Suspension Bolt Torque Specifications & Fastener Values
Cadillac DeVille 1985-1993

Cadillac DeVille 1985-1993 Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for the 1985-1993 Cadillac DeVille, including front and rear suspension components. Ensure proper installation and vehicle safety with accurate torque values.

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

Torque specifications for components of the front suspension system, including control arms, struts, and steering components.

1

Upper Control Arm to Frame Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Secures the upper control arm to the frame. Torque to specified value, use anti-seize where appropriate.
2

Upper Control Arm Ball Joint Nut

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Connects the ball joint to the upper control arm. Ensure proper seating before tightening.
3

Lower Control Arm to Frame Bolts

M14 x 2.0
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Secures the lower control arm to the frame. Apply anti-seize compound if needed.
4

Lower Control Arm Ball Joint Nut

M16 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Secures the ball joint to the lower control arm. Ensure proper seating.
5

Front Strut to Steering Knuckle Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Attaches the strut to the steering knuckle. A secure connection is essential for proper steering.
6

Front Strut Top Mounting Nuts (to frame)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the strut assembly to the vehicle's frame. Tighten in a star pattern.
7

Stabilizer Bar to Frame Bushing Bracket Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the stabilizer bar bushings to the frame. Tighten evenly.
8

Stabilizer Bar Link Bolts/Nuts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Connects the stabilizer bar links to the control arms or strut. Tighten to specified torque.
9

Tie Rod End Nut

M14 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Secures the tie rod end to the steering knuckle. Ensure proper alignment.
10

Wheel Bearing/Hub Retaining Nut

M24 x 1.5
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Holds the front hub assembly on the spindle. *MUST BE STAKED after torquing to ensure it doesn't loosen.* Estimated value, consult a manufacturer's manual.

Rear Suspension

Torque specifications for the rear suspension components, including control arms, shocks, and stabilizer bar.

1

Upper Control Arm to Frame Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Secures the upper control arm to the frame. Apply anti-seize compound if needed.
2

Lower Control Arm to Frame Bolts

M14 x 2.0
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Secures the lower control arm to the frame. Use proper torque.
3

Upper Control Arm to Rear Axle/Housing Bolts

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Connects the upper control arm to the rear axle. Ensure proper alignment.
4

Lower Control Arm to Rear Axle/Housing Bolts

M14 x 2.0
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Connects the lower control arm to the rear axle. Use proper torque.
5

Shock Absorber Upper Mount Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Attaches the upper shock absorber to the frame. Tighten evenly.
6

Shock Absorber Lower Mount Bolts

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Connects the lower shock absorber to the rear axle or control arm. Tighten properly.
7

Stabilizer Bar to Frame Bushing Bracket Bolts (Rear)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the rear stabilizer bar bushings to the frame. Ensure proper positioning.
8

Stabilizer Bar Link Bolts/Nuts (Rear)

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Connects the rear stabilizer bar links to the control arms or rear axle. Ensure proper fit.
9

Panhard Rod/Track Bar Bolts

M14 x 2.0
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Controls lateral axle movement. Proper torque is critical for alignment.

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 are torque specifications important for suspension bolts?

Correct torque specifications are crucial for suspension components. Under-torquing can cause bolts to loosen, leading to instability, noise, and premature wear. Over-torquing can stretch or break bolts, damage threads, and also cause premature failure. Proper torque ensures the components are held together with the correct clamping force for safe and reliable operation.

Q2

What happens if I don't have a torque wrench?

While you *can* attempt to tighten bolts 'by feel,' it is strongly discouraged, especially for suspension components. An inaccurate torque can lead to dangerous situations. Rent or borrow a torque wrench, or have the work done professionally. It is a critical tool for safety. Some auto parts stores offer tool rentals.

Q3

Do I need to replace suspension bolts every time I remove them?

Generally, no, but inspecting bolts for damage (stretched threads, cracks, or rust) is critical. If a bolt shows any signs of damage, replace it immediately. Some bolts, like those on strut mounts or ball joints, may be one-time use and should always be replaced when removed. Always consult your repair manual.

Q4

Should I use thread locker on suspension bolts?

Thread locker is not typically required for most suspension bolts that use prevailing torque nuts (Nyloc nuts or similar). However, some manufacturers may recommend it for specific bolts; refer to your specific service manual. If thread locker is specified, use the recommended grade (usually medium strength, like Loctite 242 or equivalent). If applying, be sure the threads are clean before application.

Q5

What is the difference between ft-lbs and Nm (Newton-meters)?

Foot-pounds (ft-lbs) and Newton-meters (Nm) are both units of torque. Ft-lbs is commonly used in the US, while Nm is used in many other countries. To convert ft-lbs to Nm, multiply by 1.356; to convert Nm to ft-lbs, divide by 1.356. For example, 100 ft-lbs is approximately 136 Nm.

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" Drive)

A calibrated torque wrench with a 1/2" drive is essential for accurately tightening suspension bolts to specification.

  • Click-type mechanism for accurate torque application
  • Wide torque range suitable for suspension components
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench with a 3/8" drive may be needed for some smaller suspension fasteners.

  • Click-type mechanism for accurate torque application
  • Suitable for lower torque specifications
Learn more

Socket Set (Standard and Metric)

A comprehensive socket set that includes both standard (SAE) and metric sizes is needed to fit all suspension fasteners.

  • Variety of sizes to fit all bolts and nuts
  • Impact-rated for use with impact tools (if needed, but torque by hand)
Learn more

Wrench Set (Standard and Metric)

A standard wrench set may be required to hold some nuts while torquing bolts.

  • Variety of sizes to fit all nuts and bolts
  • Open-end and box-end wrenches
Learn more

Jack Stands

Securely support the vehicle while working on the suspension.

  • Adjustable height
  • Sturdy base for stability
Learn more

Vehicle Jack

Used to raise the vehicle off the ground.

  • Durable and able to lift heavy weights
  • Compact for easy storage
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

Procedure for torquing the front upper control arm bolts.

  • 1. Raise the vehicle and support it with jack stands.
  • 2. Locate the front upper control arm bolts.
  • 3. Ensure the bolts are clean and in good condition.
  • 4. Tighten the bolt initially by hand then with a wrench
  • 5. Using the appropriate torque wrench, tighten the bolts to 60 ft-lbs.
  • 6. Lower the vehicle and recheck torque after a short drive
View full procedure

Front Lower Control Arm Bolt Torque Procedure

Procedure for torquing the front lower control arm bolts.

  • 1. Raise the vehicle and support it with jack stands.
  • 2. Locate the front lower control arm bolts.
  • 3. Ensure the bolts are clean and in good condition.
  • 4. Tighten the bolt initially by hand then with a wrench
  • 5. Using the appropriate torque wrench, tighten the bolts to 90 ft-lbs.
  • 6. Lower the vehicle and recheck torque after a short drive
View full procedure

Rear Control Arm Bolt Torque Procedure

Procedure for torquing the rear control arm bolts.

  • 1. Raise the vehicle and support it with jack stands.
  • 2. Locate the rear control arm bolts.
  • 3. Ensure the bolts are clean and in good condition.
  • 4. Tighten the bolt initially by hand then with a wrench
  • 5. Using the appropriate torque wrench, tighten the bolts to 65 ft-lbs.
  • 6. Lower the vehicle and recheck torque after a short drive
View full procedure

Strut/Shock Absorber Mount Torque Procedure

Procedure for torquing the strut/shock absorber mounting bolts and nuts.

  • 1. Raise the vehicle and support it with jack stands.
  • 2. Locate the strut/shock absorber mounting bolts and nuts.
  • 3. Ensure the bolts are clean and in good condition.
  • 4. Tighten the bolt initially by hand then with a wrench
  • 5. Using the appropriate torque wrench, tighten the upper mount nuts to 25 ft-lbs.
  • 6. Using the appropriate torque wrench, tighten the lower mount bolts to 60 ft-lbs.
  • 7. Lower the vehicle and recheck torque after a short drive
View full procedure
Technical Service Bulletins

Suspension Bolt Loosening and Noise

1990-03-15

Reports of loose suspension bolts leading to noise and compromised handling. Issue particularly noted on 1988-1990 models.

1988-1990

Resolution: Inspect all suspension bolts and ensure they are tightened to specification. Replace any damaged or stretched bolts. Use thread locking compound to prevent future loosening.

Front End Alignment After Suspension Work

1992-07-20

Whenever suspension components are disassembled, a front end alignment is crucial to ensure proper vehicle handling and tire wear. Special attention to proper torque and components for alignment are necessary.

1985-1993

Resolution: Always get a professional wheel alignment after performing any work on the suspension components. Verify all bolts are torqued to specification before alignment.

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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