Mercedes-Benz Mercedes G-Class 2018-present 9G-TRONIC Transmission Transmission Torque Specifications & Bolt Torque Values
Mercedes-Benz Mercedes G-Class 2018-present

Mercedes-Benz Mercedes G-Class 2018-present 9G-TRONIC Transmission Torque Specifications

Detailed torque specifications for the 9G-Tronic transmission bolts in the 2018-Present Mercedes G-Class. 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 transmission mounts, ensuring proper alignment and vibration absorption.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the transmission is securely attached and functioning smoothly.

Transmission oil pan

This subsystem includes the bolts that secure the oil pan to the transmission, containing the transmission fluid and protecting internal components.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Proper torque ensures a leak-tight seal and prevents damage to the transmission.

Transmission fluid drain and fill

This subsystem includes the plugs that allow for the transmission fluid to be drained and filled.

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Proper torque ensures a secure seal and prevents leaks.
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Similar to the above, this plug is used for draining and filling the transmission fluid.

Bellhousing and valve body

This subsystem includes the bolts that secure the bellhousing to the engine block and transmission case, and the valve body to the transmission case.

1

9G-Tronic Transmission Bellhousing Bolts

M16 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks or damage to the transmission. (Estimated value)
2

9G-Tronic Transmission Valve Body Bolts

M10 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Proper torque ensures proper hydraulic pressure and transmission function. (Estimated value)

Transmission filter and cooler lines

This subsystem includes the bolts that secure the transmission filter to the transmission, and the cooler lines to the transmission.

1

9G-Tronic Transmission Filter Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks or contamination of the transmission fluid. (Estimated value)
2

9G-Tronic Transmission Cooler Line Fittings

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks or damage to the transmission. (Estimated value)

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 9G-TRONIC transmission bolts on a 2018-Present Mercedes G-Class?

The torque specifications for the 9G-TRONIC transmission bolts vary depending on the specific bolt and location. For example, the transmission pan bolts typically require 8 Nm (71 lb-in), while the transmission-to-engine bolts may require 50 Nm (37 lb-ft) plus an additional 90-degree turn. Always refer to the official Mercedes-Benz service manual for your specific model and year to ensure accuracy.

Q2

How often should I check the torque on my 9G-TRONIC transmission bolts?

It is recommended to check the torque on your 9G-TRONIC transmission bolts during routine maintenance or after any transmission-related repairs. For example, if you replace the transmission fluid or pan, recheck the torque after 500 miles to ensure the bolts have not loosened due to thermal cycling.

Q3

Can I reuse the transmission bolts on my 9G-TRONIC system?

Mercedes-Benz generally recommends replacing certain bolts, such as those that require a torque-plus-angle tightening method, as they are designed for one-time use. Reusing these bolts can compromise the integrity of the connection. Always consult the service manual to determine which bolts can be reused and which should be replaced.

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
  • Calibration certificate included
Learn more

Torque Angle Gauge

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

  • Digital display
  • Magnetic base for easy attachment
Learn more

Transmission Jack

A hydraulic jack designed for safely supporting and positioning the transmission.

  • Adjustable height
  • Safety locking mechanism
Learn more
Service Procedures

9G-Tronic Transmission Bolt Torque Specifications

Detailed procedure for applying correct torque to 9G-Tronic transmission bolts.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan and drain the fluid.
  • Use a torque wrench to tighten the transmission pan bolts to 8 Nm (71 lb-in).
  • Tighten the transmission valve body bolts to 10 Nm (89 lb-in).
  • Reinstall the transmission pan and refill with the specified fluid.
  • Verify torque settings with a torque angle gauge if required.
View full procedure

Transmission Fluid Replacement

Procedure for replacing transmission fluid in the 9G-Tronic system.

  • Lift the vehicle and secure it on jack stands.
  • Remove the transmission fluid drain plug and drain the fluid.
  • Replace the drain plug and tighten to 25 Nm (18 lb-ft).
  • Refill the transmission with the specified fluid type and quantity.
  • Check for leaks and test drive the vehicle.
View full procedure
Technical Service Bulletins

9G-Tronic Transmission Bolt Torque Update

2021-05-15

Updated torque specifications for 9G-Tronic transmission bolts.

2018-Present Mercedes G-Class

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

Transmission Fluid Leak in 9G-Tronic Systems

2020-11-10

Reports of transmission fluid leaks in 9G-Tronic systems due to improper bolt torque.

2018-2020 Mercedes G-Class

Resolution: Inspect and retorque transmission bolts to the correct specifications.

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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