Buick LaCrosse 2017-2019 Suspension Bolt Torque Specifications & Fastener Values
Buick LaCrosse 2017-2019

Buick LaCrosse 2017-2019 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2017-2019 Buick LaCrosse, including front and rear 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 Suspension

Torque specifications for the primary components of the front suspension system, including struts, control arms, and steering linkages. These components ensure proper vehicle handling, stability, and wheel alignment.

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Value
122 ft-lbs (165 N·m)
Important Notes
Tighten the strut mounting bolts to the specified torque. Ensure the strut is properly seated before tightening. These bolts connect the strut assembly to the strut tower.
2

Control Arm Mounting Bolts

M14 x 2.0
Torque Value
89 ft-lbs (121 N·m)
Important Notes
Tighten the control arm bolts to the specified torque. Make sure the suspension is at ride height or supported before tightening to avoid binding. These bolts secure the control arm to the vehicle's frame or subframe.
3

Ball Joint Nut

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten the ball joint nut to the specified torque. Do not overtighten, as this could damage the ball joint. This nut secures the ball joint to the steering knuckle or control arm.
4

Tie Rod End Nut

M12 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Tighten the tie rod end nut to the specified torque. Make sure the tie rod end is fully seated in the steering knuckle. This nut connects the tie rod end to the steering knuckle.
5

Sway Bar Link Nut

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten the sway bar link nut to the specified torque. Make sure the links are aligned properly to the sway bar and strut or control arm. This nut secures the sway bar links to the sway bar and strut/shock or control arm.
6

Steering Knuckle to Strut Bolt/Nut

M12 x 1.75
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Tighten the steering knuckle to strut bolts/nuts to the specified torque. This ensures a secure connection between the steering knuckle and the strut.

Rear Suspension

Torque specifications for the primary components of the rear suspension system, including control arms, shocks, and trailing arms. These components ensure proper vehicle handling, stability, and wheel alignment.

1

Rear Lower Control Arm Cam Bolt and Nut

M14 x 2.0
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Tighten the rear lower control arm cam bolt and nut to the specified torque. This is critical for maintaining the rear wheel alignment. It is possible that this bolt will need to be tightened to a torque specification, then to an angle. Consult a service manual for correct torque specification and procedure.
2

Rear Upper Control Arm Bolt and Nut

M14 x 2.0
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Tighten the rear upper control arm bolt and nut to the specified torque. This is essential for maintaining the rear wheel alignment and proper control arm function. It is possible that this bolt will need to be tightened to a torque specification, then to an angle. Consult a service manual for correct torque specification and procedure.
3

Rear Shock Absorber Mounting Bolts

M12 x 1.75
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Tighten the rear shock absorber mounting bolts to the specified torque. This ensures proper function and alignment of the rear suspension. Make sure the shock is properly seated before tightening. These bolts connect the shock absorber to the vehicle frame or suspension components.
4

Trailing Arm Bolt

M14 x 2.0
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Tighten the trailing arm bolt to the specified torque. These bolts secure the trailing arm to the chassis, which is crucial for the stability of the rear suspension.

Sway Bar

Torque specifications for the sway bar mounting brackets. These components ensure proper sway bar function, which helps control body roll.

1

Sway Bar Mounting Bracket Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Tighten the sway bar mounting bracket bolts to the specified torque. Make sure the bracket is properly aligned and seated before tightening. These bolts attach the sway bar mounting brackets to the vehicle's frame or subframe.

Wheel Hub

Torque specification for the wheel hub/bearing assembly. Proper torque ensures secure wheel mounting and prevents premature bearing failure.

1

Wheel Hub/ Bearing Bolts

M14 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Tighten the wheel hub/bearing bolts to the specified torque. Ensure the hub is seated properly before tightening. These bolts secure the wheel hub/bearing assembly to the steering knuckle.

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 ensuring the proper clamping force on suspension components. Under-torquing can lead to loose bolts, resulting in component movement, noise, and potential failure. Over-torquing can stretch or break bolts, damage threads, or distort components, also leading to failure. Improperly torqued suspension can also cause alignment issues, tire wear, and unsafe handling.

Q2

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

While it's possible to tighten bolts without a torque wrench, it is highly discouraged, especially for critical suspension components. Guessing or using a standard wrench can lead to under or over-torquing. A torque wrench ensures bolts are tightened to the manufacturer's precise specifications and proper and safe operation, it is always recommended to borrow or purchase one. A torque wrench is an affordable and essential tool.

Q3

Do I need to replace suspension bolts after removing them?

Some suspension bolts are designed to be single-use (torque-to-yield) and must be replaced after removal. These bolts may stretch slightly when torqued the first time and should not be reused. Always refer to the service manual or parts catalog to determine whether bolts should be replaced or if they are reusable. It's a good practice to replace self-locking nuts, which lose their locking ability once removed.

Q4

Should I apply any lubricant to suspension bolts?

Some manufacturers recommend applying a specific anti-seize compound to threads or the underside of the bolt heads to prevent corrosion and ensure accurate torque readings. However, not all bolts require this. Always consult the service manual for your specific vehicle. Incorrectly lubing fasteners can reduce friction and lead to over tightening. If not specified, keep fasteners dry and clean.

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 calibrated torque wrench is essential for tightening suspension fasteners to the correct specification. Using the wrong torque can lead to component failure or poor handling.

  • Click-type or digital display
  • Accurate within +/- 3% range
  • Appropriate torque range for suspension components (e.g., 20-150 ft-lbs)
Learn more

Socket Set

A comprehensive socket set in both metric sizes is necessary for access to all suspension fasteners.

  • Metric sizes
  • Standard sizes
  • Various drive sizes (e.g., 3/8-inch, 1/2-inch)
Learn more

Extension Bars

Extension bars of varying lengths provide access to recessed or difficult to reach suspension fasteners.

  • Various lengths
  • Robust construction
  • Compatible with socket set
Learn more

Jack and Jack Stands

Proper lifting equipment and jack stands are critical to ensure safety when working under the vehicle.

  • Rated for vehicle weight
  • Stable and secure
  • Certified safety standards
Learn more
Service Procedures

Front Strut Assembly Bolt Torque Check and Tightening

This procedure outlines how to properly check and tighten the bolts associated with the front strut assembly of a 2017-2019 Buick Lacrosse.

  • 1. Safely lift and support the vehicle using a jack and jack stands.
  • 2. Locate the upper and lower strut mounting bolts and nuts.
  • 3. Using the correct socket, initially loosen each bolt/nut slightly.
  • 4. Refer to the specifications below for each fasteners torque spec.
  • 5. Using a torque wrench, tighten the bolts to the specified torque in the correct order to ensure equal pressure on the mounting surfaces.
  • 6. Double-check each bolt to make sure it was torqued to specification
  • 7. Carefully lower the vehicle to the ground.
View full procedure

Rear Suspension Control Arm Bolt Torque Check and Tightening

This procedure details the steps to check and tighten the control arm bolts in the rear suspension system of a 2017-2019 Buick Lacrosse.

  • 1. Safely lift and support the vehicle using a jack and jack stands.
  • 2. Locate the control arm bolts at both the frame and hub side.
  • 3. Using the correct socket, initially loosen each bolt/nut slightly.
  • 4. Refer to the specifications below for each fasteners torque spec.
  • 5. Using a torque wrench, tighten the bolts to the specified torque in the correct order to ensure equal pressure on the mounting surfaces.
  • 6. Double-check each bolt to make sure it was torqued to specification
  • 7. Carefully lower the vehicle to the ground.
View full procedure

Sway Bar Link and Bracket Bolt Torque Check and Tightening

This procedure details the steps to check and tighten the sway bar link and bracket bolts in the suspension system of a 2017-2019 Buick Lacrosse.

  • 1. Safely lift and support the vehicle using a jack and jack stands.
  • 2. Locate the sway bar link mounting bolts and the sway bar bracket bolts.
  • 3. Using the correct socket, initially loosen each bolt/nut slightly.
  • 4. Refer to the specifications below for each fasteners torque spec.
  • 5. Using a torque wrench, tighten the bolts to the specified torque in the correct order to ensure equal pressure on the mounting surfaces.
  • 6. Double-check each bolt to make sure it was torqued to specification
  • 7. Carefully lower the vehicle to the ground.
View full procedure
Technical Service Bulletins

Suspension Noise Due to Loose Strut Mount Bolts

2018-05-15

Some 2017-2018 Buick Lacrosse vehicles may experience a clunking or rattling noise from the front suspension. This is often caused by the upper strut mount bolts loosening over time. Check and torque to spec.

2017-2018

Resolution: Inspect the upper strut mount bolts, tighten the bolts to 90Nm, plus an additional 180 degrees.

Rear Control Arm Bolt Inspection and Retorque

2019-01-20

Vehicles within the specified model year range may have rear control arm fasteners that were not tightened to specification during assembly. Loose bolts can cause unwanted suspension noises and movement. Inspection and proper torque are required.

2017-2019

Resolution: Inspect and retorque all rear control arm mounting bolts. Frame side 135 Nm + 90 degrees. Hub side, 90Nm + 180 degrees.

Sway Bar Link End Play and Noise

2017-11-10

Some vehicles are experiencing premature wear of the sway bar links, which leads to play in the joint and clunking noises. Verify proper torque on both link ends. Also, verify all mounting points are secure.

2017

Resolution: Verify the sway bar link mounting bolts are torqued to 65 Nm and the sway bar bracket bolts are torqued to 45 Nm.

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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