Mercedes-Benz Mercedes CLA 2013-2019 7G-DCT Transmission Transmission Torque Specifications & Bolt Torque Values
Mercedes-Benz Mercedes CLA 2013-2019

Mercedes-Benz Mercedes CLA 2013-2019 7G-DCT Transmission Torque Specifications

Detailed torque specifications for the 7G-DCT transmission bolts in the 2013-2019 Mercedes CLA. Includes step-by-step instructions and technical details for proper installation and maintenance.

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

Transmission mounting

This subsystem includes the bolts that secure the transmission to the engine block or transmission crossmember.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
35 ft-lbs (47 N·m)

Transmission oil pan

This subsystem includes the bolts that secure the oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
80 in-lbs (9 N·m)
Important Notes
Note: The torque value is specified in inch-lbs, which is equivalent to 9 Nm.

Transmission fluid drain and fill

This subsystem includes the plugs that allow for the draining and filling of transmission fluid.

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
15 ft-lbs (20 N·m)
2

Transmission Fluid Drain/Fill Plug

M12 x 1.5
Torque Value
35 ft-lbs (47 N·m)

7g-dct transmission case

This subsystem includes the bolts that secure the transmission case together.

1

7G-DCT Transmission Case Bolts

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Note: The torque value is estimated based on industry standards for similar transmission cases.

7g-dct transmission gearbox cover

This subsystem includes the bolts that secure the gearbox cover to the transmission case.

1

7G-DCT Transmission Gearbox Cover Bolts

M10 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Note: The torque value is estimated based on industry standards for similar gearbox covers.

7g-dct transmission clutch pack

This subsystem includes the bolts that secure the clutch pack to the transmission case.

1

7G-DCT Transmission Clutch Pack Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Note: The torque value is estimated based on industry standards for similar clutch packs.

7g-dct transmission gearbox mounting

This subsystem includes the bolts that secure the gearbox to the transmission case.

1

7G-DCT Transmission Gearbox Mounting Bolts

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Note: The torque value is estimated based on industry standards for similar gearbox mounts.

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 7G-DCT transmission bolts on a 2013-2019 Mercedes CLA?

The torque specifications for the 7G-DCT transmission bolts vary depending on the specific bolt and location. For example, the transmission housing bolts typically require 25 Nm (18.4 lb-ft), while the torque converter bolts may require 50 Nm (36.9 lb-ft). Always refer to the official Mercedes-Benz service manual for your specific model year and transmission type to ensure accuracy.

Q2

How often should I check the torque on my 7G-DCT transmission bolts?

It is recommended to check the torque on critical transmission bolts during routine maintenance or after any major service involving the transmission. For example, after replacing the transmission fluid or performing a clutch repair, re-torquing the bolts ensures proper sealing and alignment. Regular inspections every 30,000 miles or as specified in your owner's manual are also advisable.

Q3

Can I reuse the transmission bolts on my 7G-DCT?

Mercedes-Benz typically recommends replacing transmission bolts after removal, as they are often torque-to-yield (TTY) bolts designed for one-time use. Reusing these bolts can compromise their integrity and lead to improper torque application, potentially causing leaks or component failure. Always use new, manufacturer-approved bolts when reassembling the transmission.

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

Torque Angle Gauge

A tool to measure the angle of rotation during torque application.

  • Digital display
  • Easy-to-use interface
Learn more
Service Procedures

Transmission Bolt Torque Application

Detailed steps for applying the correct torque to 7G-DCT transmission bolts.

  • 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 thread locker if specified.
  • Use a torque wrench to tighten the bolts to the specified torque value in a crisscross pattern.
  • Use a torque angle gauge to apply the final angle tightening if required.
  • Reinstall the transmission pan and ensure all bolts are secure.
View full procedure

Transmission Fluid Replacement

Procedure for replacing transmission fluid in the 7G-DCT system.

  • Drain the old transmission fluid by removing the drain plug.
  • Replace the drain plug and refill with the specified transmission fluid.
  • Use a torque wrench to tighten the drain plug to the specified torque.
  • Check the fluid level using the dipstick or level check procedure.
View full procedure
Technical Service Bulletins

Transmission Bolt Torque Specification Update

2017-05-15

Updated torque specifications for 7G-DCT transmission bolts.

2013-2019 Mercedes CLA

Resolution: Refer to the latest service manual for updated torque values and ensure proper tightening procedures are followed.

Transmission Fluid Leak Advisory

2018-09-20

Advisory regarding potential transmission fluid leaks due to improper bolt torque.

2013-2019 Mercedes CLA

Resolution: Inspect transmission bolts for proper torque and re-torque if necessary. Replace any damaged seals or gaskets.

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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