Buick LaCrosse 2010-2016 Suspension Bolt Torque Specifications & Fastener Values
Buick LaCrosse 2010-2016

Buick LaCrosse 2010-2016 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2010-2016 Buick LaCrosse, including front and rear suspension components.

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 Strut Assembly

Specifications for the front strut assembly, including mounting to the steering knuckle and upper mount.

1

Front Strut to Steering Knuckle Bolts

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These are often pinch bolts. Ensure proper alignment of the strut before tightening. Estimated value.
2

Upper Strut Mounting Bolts

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
These bolts secure the upper strut mount to the vehicle's chassis. Tighten in a cross pattern.

Front Control Arms

Specifications for the front lower control arms, including mounts to the frame and steering knuckle.

1

Control Arm to Frame Mounting Bolts

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure the control arm is properly aligned before tightening. Estimated value based on standard bolt.
2

Lower Control Arm to Subframe Mounting Bolts

M16 x 1.5
Torque Value
110 ft-lbs (150 N·m)
Important Notes
These bolts secure the control arm to the subframe if applicable. Estimated value.
3

Ball Joint Nut

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Secures ball joint to control arm or knuckle. Estimated value.

Front Steering

Specifications for tie rod ends and steering rack mounting.

1

Tie Rod End Nut

M12 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures tie rod end to the steering knuckle. Essential for steering alignment.
2

Steering Gear/Rack Mounting Bolts

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Mounting the steering rack to the subframe. Ensure proper rack alignment before tightening.

Front Sway Bar

Specifications for the front sway bar links and mounting brackets.

1

Sway Bar Link Nut

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the sway bar link to the sway bar and strut/control arm. Estimated value.
2

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Bolts that secure sway bar bracket to the frame. Ensure correct bracket position.

Rear Suspension

Specifications for the rear suspension components.

1

Rear Shock to Lower Control Arm Bolt

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Secures the rear shock to the lower control arm. Estimated value.
2

Rear Control Arm Mounting Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Mounts the rear control arm to the chassis. Estimated value.

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 is using the correct torque specification important for suspension bolts?

Using the correct torque specification is crucial for the safe and proper functioning of your vehicle's suspension. Under-tightening bolts can lead to components loosening over time, causing instability, noise, and potentially catastrophic failure. Over-tightening can stretch or break bolts, damage threads, and distort suspension parts, also leading to failure. Proper torque ensures the bolts provide the correct clamping force, maintaining the structural integrity of the suspension system.

Q2

What happens if I over-torque a suspension bolt?

Over-torquing a suspension bolt can cause several issues. You might stretch the bolt beyond its yield point, weakening it and making it susceptible to breaking. It can also damage the threads in the bolt or the receiving hole, making it difficult or impossible to properly tighten the bolt in the future. Additionally, over-tightening can compress bushings or other components excessively, leading to premature wear or failure. An example would be over-tightening a control arm bolt, which could damage the bushing and lead to premature bushing failure.

Q3

What happens if I under-torque a suspension bolt?

Under-torquing suspension bolts can be equally problematic. Loose bolts will not provide adequate clamping force, causing components to shift, move, or vibrate excessively. This can lead to unusual noises, wear on other components, and decreased handling performance. A loose tie rod end, for example, can result in significant steering play and potentially cause a loss of vehicle control. Additionally, if the component is loose enough it could cause premature failure.

Q4

Can I reuse suspension bolts?

Generally, it's recommended to replace suspension bolts, especially torque-to-yield (TTY) bolts, when they are removed. TTY bolts are designed to stretch when tightened, and they should not be reused as they can lose their clamping force. Even non-TTY bolts may fatigue over time or develop minor damage, therefore following the manufacturers recommendations on reuse is essential. Always check the repair manual for your vehicle to confirm.

Q5

Do I need to use threadlocker on suspension bolts?

Whether or not you need threadlocker on suspension bolts depends on the specific bolt and the vehicle manufacturer's recommendations. Some bolts are designed with self-locking features, while others require threadlocker. Refer to your vehicle's service manual for the appropriate application. Using the correct threadlocker (e.g. blue medium strength or red high strength) as recommended by the manufacturer will ensure bolts stay secure.

Q6

Do torque specifications change if I have aftermarket suspension components?

Yes, torque specifications can change when using aftermarket suspension components. The manufacturers of the aftermarket parts will provide their recommended torque specifications and you should always follow those instructions. If they do not, it's best practice to contact the manufacturer for their recommendations to ensure proper and safe installation.

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 is essential for accurately tightening suspension fasteners to the manufacturer's specifications.

  • 1/2" drive for common automotive fasteners
  • Wide torque range (e.g., 20-150 ft-lbs or similar)
  • Click-type or digital for precise readings
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque fasteners

  • 3/8" drive for smaller fasteners
  • Wide torque range (e.g., 5-80 ft-lbs or similar)
  • Click-type or digital for precise readings
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various sizes of bolts and nuts in the suspension system.

  • Standard and deep sockets
  • Common sizes for suspension work (e.g., 10mm, 13mm, 15mm, 18mm, 21mm)
  • 6-point design for better grip
Learn more

Wrench Set (Metric)

A comprehensive set of metric wrenches to fit the various sizes of bolts and nuts in the suspension system.

  • Common sizes for suspension work (e.g., 10mm, 13mm, 15mm, 18mm, 21mm)
  • Combination style (open and box end)
Learn more

Jack and Jack Stands

For safely lifting and supporting the vehicle to access the suspension components.

  • Rated for the vehicle's weight
  • Stable and secure placement
  • Meets safety standards
Learn more

Penetrating Oil

To help loosen any rusted or seized bolts

  • Fast acting
  • Lubricates seized parts
Learn more
Service Procedures

Front Strut Assembly Bolt Torque Procedure

Procedure for tightening the bolts securing the front strut assembly to the vehicle.

  • Raise the vehicle and support it securely on jack stands.
  • Remove the wheel from the side you will be working on.
  • Locate the strut-to-knuckle bolts and strut-to-body bolts.
  • Install all bolts by hand to ensure proper alignment.
  • Using the appropriate torque wrench and sockets, tighten the strut-to-knuckle bolts to the manufacturer's specified torque in ft-lbs.
  • Using the appropriate torque wrench and sockets, tighten the strut-to-body bolts to the manufacturer's specified torque in ft-lbs.
  • Reinstall the wheel and lower the vehicle.
  • Perform a visual inspection, double check the bolts are torqued correctly.
View full procedure

Rear Shock Absorber Bolt Torque Procedure

Procedure for tightening the bolts securing the rear shock absorber to the vehicle.

  • Raise the vehicle and support it securely on jack stands.
  • Remove the wheel from the side you will be working on.
  • Locate the upper and lower shock absorber mounting bolts.
  • Install all bolts by hand to ensure proper alignment.
  • Using the appropriate torque wrench and sockets, tighten the upper shock mount bolts to the manufacturer's specified torque in ft-lbs.
  • Using the appropriate torque wrench and sockets, tighten the lower shock mount bolts to the manufacturer's specified torque in ft-lbs.
  • Reinstall the wheel and lower the vehicle.
  • Perform a visual inspection, double check the bolts are torqued correctly.
View full procedure

Control Arm Bolt Torque Procedure

Procedure for tightening the bolts securing the front and rear control arms to the vehicle.

  • Raise the vehicle and support it securely on jack stands.
  • Locate the control arm mounting bolts.
  • Install all bolts by hand to ensure proper alignment.
  • Using the appropriate torque wrench and sockets, tighten the control arm bolts to the manufacturer's specified torque in ft-lbs.
  • Lower the vehicle.
  • Perform a visual inspection, double check the bolts are torqued correctly.
View full procedure
Technical Service Bulletins

Suspension Noise and Loose Fasteners

2015-05-15

Reports of suspension noise and prematurely loose fasteners on some 2010-2013 LaCrosse models.

2010-2013

Resolution: Inspect all suspension fasteners and tighten to the correct torque specifications. Apply thread locker where needed. Always use new fasteners and follow the torque procedure.

Front Strut Mounting Bolts Corrosion

2012-08-22

Some vehicles in areas with heavy road salt application have exhibited excessive corrosion on the front strut mounting bolts. This can lead to premature wear and loosening.

2010-2012

Resolution: Inspect strut mounting bolts for corrosion and replace any damaged or corroded hardware. Apply anti-seize to the threads of new fasteners during reinstallation and ensure correct torque.

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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