Mercedes-Benz Mercedes CLS 2004-2010 Drivetrain Bolt Torque Specifications
Detailed torque specifications for the drivetrain components of the 2004-2010 Mercedes-Benz CLS, including transmission, driveshaft, and differential bolts.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
Bolts and nuts that secure the engine and transmission to the vehicle's frame and mounts.
1 Engine Block to Transmission Bellhousing Bolts
M12 x 1.5
Engine Block to Transmission Bellhousing Bolts
M12 x 1.5Torque Value
Important Notes
2 Transmission Mounting Bolts
M10 x 1.25
Transmission Mounting Bolts
M10 x 1.25Torque Value
Transmission and driveshaft
Bolts and nuts that secure the transmission and driveshaft components.
1 Transmission Oil Pan Bolts
M8 x 1.25
Transmission Oil Pan Bolts
M8 x 1.25Torque Value
2 Transmission Drain and Fill Plugs
M12 x 1.5
Transmission Drain and Fill Plugs
M12 x 1.5Torque Value
3 Driveshaft Center Bearing Bolts
M10 x 1.25
Driveshaft Center Bearing Bolts
M10 x 1.25Torque Value
Important Notes
Differential and axles
Bolts and nuts that secure the differential and axle components.
1 Differential Drain/Fill Plug
M12 x 1.5
Differential Drain/Fill Plug
M12 x 1.5Torque Value
2 Axle Shaft Retaining Bolts
M12 x 1.5
Axle Shaft Retaining Bolts
M12 x 1.5Torque Value
Important Notes
3 CV Joint/Axle Nut
M20 x 1.5
CV Joint/Axle Nut
M20 x 1.5Torque Value
Engine internals
Bolts and nuts that secure the engine internal components.
1 Flywheel Bolts
M12 x 1.5
Flywheel Bolts
M12 x 1.5Torque Value
2 Main Bearing Bolts
M14 x 1.5
Main Bearing Bolts
M14 x 1.5Torque Value
3 Connecting Rod Nuts
M10 x 1.25
Connecting Rod Nuts
M10 x 1.25Torque Value
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 2004-2010 Mercedes CLS?
What is the torque specification for the driveshaft bolts on a 2004-2010 Mercedes CLS?
The torque specification for the driveshaft bolts on a 2004-2010 Mercedes CLS is typically 70 Nm (52 lb-ft). Always refer to the manufacturer's service manual for your specific model and year, as variations may exist.
Q2 How often should I check the torque on drivetrain components?
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 30,000 miles) or after any work involving these components. Loose bolts can lead to vibrations, noise, or even component failure.
Q3 Can I reuse drivetrain bolts, or should they be replaced?
Can I reuse drivetrain bolts, or should they be replaced?
Drivetrain bolts, especially those subjected to high stress (e.g., driveshaft or axle bolts), should ideally be replaced during reassembly. Reusing old bolts can compromise their integrity due to stretching or wear. Always follow the manufacturer's recommendations for bolt replacement.
Q4 What happens if I over-torque a drivetrain bolt?
What happens if I over-torque a drivetrain bolt?
Over-torquing a drivetrain bolt can lead to thread damage, bolt stretching, or even component failure. This can cause vibrations, leaks, or catastrophic drivetrain issues. Always use a calibrated torque wrench and follow the specified torque values.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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
A precision tool for applying accurate torque to drivetrain bolts.
- Adjustable torque settings
- LCD display for real-time torque readings
Torque Angle Gauge
Used to measure the angle of rotation when applying torque-to-yield bolts.
- Magnetic base for easy attachment
- 360-degree rotation measurement
Thread Locking Compound
A chemical adhesive to secure bolts and prevent loosening.
- High-strength formula
- Resistant to vibration and temperature changes
Service Procedures
Driveshaft Bolt Torque Specification
Procedure for applying the correct torque to driveshaft bolts on a 2004-2010 Mercedes CLS.
- Ensure the vehicle is securely lifted and supported.
- Clean the bolt threads and apply thread locking compound.
- Tighten the driveshaft bolts to 50 Nm (37 lb-ft) using a torque wrench.
- Use a torque angle gauge to apply an additional 90-degree rotation.
Transmission Mount Bolt Torque Specification
Procedure for tightening transmission mount bolts to the correct torque.
- Locate the transmission mount bolts.
- Tighten the bolts to 25 Nm (18 lb-ft) using a torque wrench.
- Verify the torque with a second pass to ensure accuracy.
Technical Service Bulletins
Drivetrain Bolt Loosening Issue
2008-05-15Reports of drivetrain bolts loosening over time due to insufficient torque application.
Resolution: Ensure all drivetrain bolts are torqued to the manufacturer's specifications and use thread locking compound where recommended.
Driveshaft Bolt Failure
2009-11-20Driveshaft bolts failing prematurely due to incorrect torque angle application.
Resolution: Follow the torque-to-yield procedure, including the specified torque angle, to prevent bolt failure.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.