Mercedes-Benz Mercedes SLS 2010-2014 Drivetrain Bolt Torque Specifications & Fastener Values
Mercedes-Benz Mercedes SLS 2010-2014

Mercedes-Benz Mercedes SLS 2010-2014 Drivetrain Bolt Torque Specifications

Comprehensive torque specifications for the drivetrain bolts of the 2010-2014 Mercedes SLS AMG, including axle, driveshaft, and differential fasteners.

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

Engine and transmission mounting

This subsystem includes components that secure the engine and transmission to the chassis, ensuring proper drivetrain alignment and preventing damage to surrounding components.

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.
2

Transmission Crossmember Bolts

M12 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.

Flywheel and crankshaft

This subsystem includes components that secure the flywheel to the crankshaft, ensuring proper engine timing and balance.

1

Flywheel Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)

Transmission and driveshaft

This subsystem includes components that secure the transmission to the engine and chassis, ensuring proper drivetrain alignment and preventing damage to surrounding components.

1

Transmission Mounting Bolts

M12 x 1.25
Torque Value
45 ft-lbs (61 N·m)
2

Propeller/Drive Shaft Bolts

M14 x 1.5
Torque Value
75 ft-lbs (102 N·m)

Differential and axles

This subsystem includes components that secure the differential and axles to the transmission and chassis, ensuring proper drivetrain alignment and preventing damage to surrounding components.

1

Differential Cover Bolts

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.
2

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Value
65 ft-lbs (88 N·m)
3

CV Joint/Axle Nut

M18 x 1.5
Torque Value
180 ft-lbs (244 N·m)

Transfer case and differential fluid

This subsystem includes components that secure the transfer case and differential fluid plugs, ensuring proper fluid levels and preventing damage to surrounding components.

1

Transfer Case Drain/Fill Plug

M12 x 1.25
Torque Value
25 ft-lbs (34 N·m)
2

Differential Drain/Fill Plug

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)

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 is the torque specification for the driveshaft bolts on a 2010-2014 Mercedes SLS?

The torque specification for the driveshaft bolts on a 2010-2014 Mercedes SLS is typically 50 Nm (37 lb-ft). Always refer to the manufacturer's service manual for the exact specifications, as variations may exist depending on the specific model or modifications.

Q2

How often should I check the torque on drivetrain components?

It is recommended to check the torque on drivetrain components, such as driveshaft bolts and axle nuts, during routine maintenance intervals (e.g., every 20,000 miles or as specified in the owner's manual). Additionally, recheck torque after any drivetrain repairs or modifications to ensure proper tightness and safety.

Q3

Can I reuse drivetrain bolts, or should they be replaced?

Drivetrain bolts, especially those subjected to high stress (e.g., driveshaft or differential bolts), should ideally be replaced during reassembly. Many manufacturers specify these bolts as single-use due to their stretch characteristics. Reusing them can compromise their integrity and lead to failure.

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

Digital Torque Wrench

Precision tool for applying exact torque values

  • Adjustable torque settings
  • Digital display for accuracy
Learn more

Angle Torque Meter

Tool to measure torque angle during application

  • Angle measurement capability
  • Compatible with torque wrenches
Learn more
Service Procedures

Drivetrain Bolt Torque Application

Procedure for applying correct torque to drivetrain bolts

  • Clean and inspect all bolts and threads
  • Apply specified torque using a digital torque wrench
  • Use an angle torque meter to ensure correct angle application
View full procedure

Drivetrain Bolt Inspection

Procedure for inspecting drivetrain bolts for wear and damage

  • Remove drivetrain cover to access bolts
  • Inspect bolts for any signs of wear or damage
  • Replace any damaged bolts with OEM parts
View full procedure
Technical Service Bulletins

Drivetrain Bolt Torque Specification Update

2012-06-15

Updated torque specifications for drivetrain bolts

2010-2014 Mercedes SLS

Resolution: Apply updated torque specifications during service

Drivetrain Bolt Failure Notice

2013-09-20

Report of drivetrain bolt failures due to incorrect torque application

2010-2014 Mercedes SLS

Resolution: Ensure correct torque specifications are used and inspect bolts regularly

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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