Mercedes-Benz Mercedes CLS 2004-2010 5G-TRONIC Transmission Transmission Torque Specifications & Bolt Torque Values
Mercedes-Benz Mercedes CLS 2004-2010

Mercedes-Benz Mercedes CLS 2004-2010 5G-TRONIC Transmission Torque Specifications

Detailed bolt torque specifications for the 5G-Tronic transmission in the 2004-2010 Mercedes CLS. Includes torque values for critical bolts, installation tips, and maintenance guidelines.

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

Mounting and adapters

Components that secure the transmission to the engine block or transmission crossmember, ensuring proper alignment and preventing movement that could cause damage to the transmission or surrounding components.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secure the transmission to the engine block or transmission crossmember.
2

Transmission Bellhousing Bolts

M12 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value. Secures the bellhousing to the transmission, ensuring proper alignment and preventing movement that could cause damage to the transmission or surrounding components.

Oil pan and fluid management

Components that ensure proper lubrication and prevent oil leaks.

1

Transmission Oil Pan Bolts

M10 x 1
Torque Value
71 inch-lbs (8 N·m)
Important Notes
Secure the oil pan to the transmission, preventing oil leaks and ensuring the transmission is properly lubricated.
2

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Allow for the transmission fluid to be drained and filled, and proper torque ensures they are securely sealed to prevent leaks.
3

Transmission Filter Bolts

M8 x 1
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Secure the transmission filter to the transmission, ensuring proper filtration and preventing contamination of the transmission fluid.

Drive shaft and propeller

Components that connect the driveshaft to the transmission, ensuring proper power transfer and preventing damage to the driveshaft or transmission.

1

Propeller/Drive Shaft Bolts

M16 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connect the driveshaft to the transmission, ensuring proper power transfer and preventing damage to the driveshaft or transmission.

Valve body and solenoid pack

Components that control hydraulic pressure and prevent leaks.

1

Transmission Valve Body Bolts

M12 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value. Secures the valve body to the transmission, ensuring proper hydraulic pressure and preventing leaks.
2

Transmission Solenoid Pack Bolts

M8 x 1
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Secure the solenoid pack to the transmission, ensuring proper electrical connections and preventing damage to the solenoids.

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 5G-Tronic transmission bolts on a 2004-2010 Mercedes CLS?

The torque specifications vary depending on the specific bolt. For example, the transmission pan bolts typically require 8 Nm (71 lb-in), while the valve body bolts require 10 Nm (89 lb-in). Always refer to the manufacturer's service manual for precise values, as incorrect torque can lead to leaks or damage.

Q2

How often should I check the torque on my 5G-Tronic transmission bolts?

It is recommended to check the torque during routine maintenance, such as when replacing the transmission fluid or filter (every 40,000-60,000 miles). Additionally, inspect bolts if you notice leaks, unusual noises, or shifting issues, as loose bolts can cause these problems.

Q3

Can I reuse the transmission pan bolts on my 5G-Tronic transmission?

While some mechanics reuse transmission pan bolts, it is generally recommended to replace them with new ones. Reused bolts may not achieve the proper torque due to stretching or wear, which can lead to leaks or improper sealing.

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 torque wrench for accurate bolt tightening.

  • Adjustable torque settings
  • Calibrated for high accuracy
Learn more

Socket Set

A set of sockets compatible with transmission bolts.

  • Metric sizes
  • Durable construction
Learn more

Thread Locking Compound

A medium-strength thread locker to secure bolts.

  • Prevents loosening due to vibration
  • Resistant to oil and heat
Learn more
Service Procedures

5G-Tronic Transmission Bolt Torque Specifications

Detailed steps to properly torque the transmission bolts on a 2004-2010 Mercedes CLS.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan to access the bolts.
  • Clean the bolt threads and apply a medium-strength thread locking compound.
  • Tighten the bolts in a crisscross pattern to the specified torque: 10 Nm (7.4 lb-ft) for small bolts, 25 Nm (18.4 lb-ft) for medium bolts, and 50 Nm (36.9 lb-ft) for large bolts.
  • Reinstall the transmission pan and refill with the appropriate transmission fluid.
View full procedure
Technical Service Bulletins

Transmission Bolt Loosening Issue

2008-05-15

Reports of transmission bolts loosening over time due to insufficient torque or lack of thread locker.

2004-2010 Mercedes CLS with 5G-Tronic Transmission

Resolution: Ensure proper torque specifications are followed and use a medium-strength thread locking compound during installation.

Transmission Fluid Leak from Pan

2009-11-20

Leaks reported due to improperly torqued transmission pan bolts.

2004-2010 Mercedes CLS with 5G-Tronic Transmission

Resolution: Verify torque specifications and re-torque bolts if necessary. Replace the transmission pan gasket if damaged.

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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