Mercedes-Benz Mercedes GLK 2008-2015 Suspension Bolt Torque Specifications & Fastener Values
Mercedes-Benz Mercedes GLK 2008-2015

Mercedes-Benz Mercedes GLK 2008-2015 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2008-2015 Mercedes-Benz GLK, 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 Suspension

The front suspension system includes components such as struts, control arms, ball joints, and tie rod ends. Proper torque application is critical for maintaining alignment, handling, and safety.

1

Strut/Shock Absorber Mounting Bolts

M10 x 1.25
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Ensure the strut is properly aligned before tightening.
2

Control Arm Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Use a torque sequence to ensure even clamping force.
3

Ball Joint Nut

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the ball joint is properly seated before tightening.
4

Tie Rod End Nut

M8 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the tie rod end is properly aligned before tightening.
5

Sway Bar Link Nut

M8 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the sway bar link is properly seated before tightening.
6

Steering Gear/Rack Bolts

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Use a torque sequence to ensure even clamping force.

Rear Suspension

The rear suspension system includes components such as shock absorbers, trailing arms, sway bars, and hub carriers. Proper torque application is critical for maintaining stability and ride quality.

1

Rear Shock Absorber Mounting Bolts

M10 x 1.25
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Ensure the shock absorber is properly aligned before tightening.
2

Rear Sway Bar Mounting Bolts

M8 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the sway bar is properly seated before tightening.
3

Rear Hub Carrier Bolts

M14 x 1.5
Torque Value
147 ft-lbs (200 N·m)
Important Notes
Use a torque sequence to ensure even clamping force.

Wheels

The wheel assembly includes components such as lug nuts. Proper torque application is critical for ensuring the wheels remain securely attached to the vehicle.

1

Wheel Lug Nuts

M12 x 1.5
Torque Value
96 ft-lbs (130 N·m)
Important Notes
Always use a star pattern to tighten lug nuts.

Subframe

The subframe is a structural component that supports the suspension and engine. Proper torque application is critical for maintaining suspension geometry and overall vehicle stability.

1

Subframe Mounting Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Use a torque sequence to ensure even clamping force.

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 2008-2015 Mercedes GLK?

The torque specifications vary depending on the specific suspension component. For example, the front lower control arm bolts typically require 90 Nm (66 lb-ft) + an additional 90-degree turn, while the rear axle carrier bolts may require 120 Nm (89 lb-ft). Always refer to the official Mercedes-Benz repair manual for your specific model and year for precise values.

Q2

How often should suspension bolts be checked for proper torque?

Suspension bolts should be checked during routine maintenance, such as tire rotations or alignment services, or after any suspension repair. Additionally, if you notice unusual noises, vibrations, or handling issues, inspect the bolts immediately. Regular checks every 10,000-15,000 miles are recommended.

Q3

Can I reuse suspension bolts after removal?

Mercedes-Benz often specifies that suspension bolts are single-use and should be replaced after removal due to their stretch-to-yield design. Reusing these bolts can compromise their integrity and lead to failure. Always consult the repair manual for your specific model to confirm whether replacement is required.

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 values to bolts.

  • Adjustable torque settings
  • Durable construction for heavy-duty use
Learn more

Socket Set

A set of sockets compatible with suspension bolts.

  • Multiple sizes for various bolts
  • Impact-rated for durability
Learn more

Torque Angle Gauge

A tool to measure the angle of rotation for torque-to-yield bolts.

  • Digital display for accuracy
  • Easy-to-use design
Learn more
Service Procedures

Front Suspension Bolt Torque Application

Procedure for applying correct torque to front suspension bolts.

  • Lift the vehicle and secure it on jack stands.
  • Remove the front wheels to access suspension components.
  • Use a torque wrench to tighten the lower control arm bolts to 90 Nm (66 lb-ft).
  • Tighten the front strut mount bolts to 70 Nm (52 lb-ft).
  • Reinstall the wheels and lower the vehicle.
View full procedure

Rear Suspension Bolt Torque Application

Procedure for applying correct torque to rear suspension bolts.

  • Lift the vehicle and secure it on jack stands.
  • Remove the rear wheels to access suspension components.
  • Use a torque wrench to tighten the rear shock absorber bolts to 120 Nm (89 lb-ft).
  • Tighten the rear subframe bolts to 100 Nm (74 lb-ft).
  • Reinstall the wheels and lower the vehicle.
View full procedure
Technical Service Bulletins

Suspension Bolt Torque Specification Update

2012-05-15

Updated torque specifications for suspension bolts to prevent loosening.

2008-2015 Mercedes GLK

Resolution: Apply updated torque values as specified in the service manual.

Front Strut Mount Bolt Failure

2014-08-22

Reports of front strut mount bolts failing due to incorrect torque application.

2010-2013 Mercedes GLK

Resolution: Replace failed bolts and ensure proper torque is applied during installation.

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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