Mercedes-Benz Mercedes GLA 2020-present 8G-DCT Transmission Transmission Torque Specifications & Bolt Torque Values
Mercedes-Benz Mercedes GLA 2020-present

Mercedes-Benz Mercedes GLA 2020-present 8G-DCT Transmission Torque Specifications

Detailed torque specifications for the 8G-DCT transmission bolts in the 2020-Present Mercedes GLA. 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 and case

This subsystem includes the bolts that secure the transmission to the vehicle's chassis and the transmission case together.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
37 ft-lbs (50 N·m)
2

8G-DCT Transmission Case Bolts

M14 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on industry standards for similar transmission cases.

Transmission oil pan and fluid system

This subsystem includes the bolts that secure the oil pan to the transmission and the transmission fluid drain and fill plugs.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
8 ft-lbs (11 N·m)
2

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)
3

Transmission Fluid Drain/Fill Plug

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)

Transmission clutch and gear system

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

1

8G-DCT Transmission Clutch Pack Bolts

M12 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on industry standards for similar clutch pack applications.
2

8G-DCT Transmission Gear Set Bolts

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on industry standards for similar gear set applications.

Transmission solenoid system

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

1

8G-DCT Transmission Solenoid Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards for similar solenoid applications.

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 8G-DCT transmission bolts in a 2020-Present Mercedes GLA?

The torque specifications for the 8G-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) plus an additional 90-degree turn, while the torque converter bolts may require 50 Nm (36.9 lb-ft). Always refer to the official Mercedes-Benz service manual for precise values, as incorrect torque can lead to transmission failure.

Q2

How often should I check the torque on the 8G-DCT transmission bolts?

The torque on the 8G-DCT transmission bolts should be checked during routine maintenance or after any repair work involving the transmission. For example, if the transmission has been removed and reinstalled, it is critical to verify the torque settings to ensure proper assembly and prevent leaks or component damage.

Q3

Can I reuse the transmission bolts on the 8G-DCT system?

No, it is generally recommended to replace the transmission bolts on the 8G-DCT system during reassembly. These bolts are often designed as stretch bolts, which means they deform slightly when torqued to specification. Reusing them can compromise their integrity and lead to improper clamping force, risking transmission 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

A precision tool for applying accurate torque to transmission bolts.

  • Adjustable torque settings
  • Digital display for precise readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation during torque-to-yield applications.

  • Magnetic base for easy attachment
  • Clear angle markings
Learn more

Transmission Jack

A specialized jack designed to safely support and position the transmission during service.

  • Adjustable height and tilt
  • Secure locking mechanism
Learn more
Service Procedures

8G-DCT Transmission Bolt Torque Application

Detailed steps for applying the correct torque to transmission bolts on the 2020-Present Mercedes GLA.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan and drain the fluid if necessary.
  • Identify the specific bolts requiring torque application (refer to the service manual).
  • Using a digital torque wrench, apply the specified torque in the correct sequence.
  • For torque-to-yield bolts, use a torque angle gauge to achieve the required angle after initial torque.
  • Reassemble the transmission components and refill with the appropriate fluid.
View full procedure
Technical Service Bulletins

8G-DCT Transmission Bolt Torque Specification Update

2022-05-15

Updated torque specifications for the 8G-DCT transmission bolts to prevent over-tightening and potential damage.

2020-Present Mercedes GLA

Resolution: Follow the revised torque specifications provided in the updated service manual.

8G-DCT Transmission Fluid Leak Due to Improper Bolt Torque

2021-11-10

Reports of fluid leaks in the 8G-DCT transmission due to incorrect bolt torque during assembly.

2020-Present Mercedes GLA

Resolution: Verify and reapply the correct torque to all transmission bolts as per the service manual.

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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