Mercedes-Benz Mercedes S-Class 2021-present 9G-TRONIC Transmission Transmission Torque Specifications & Bolt Torque Values
Mercedes-Benz Mercedes S-Class 2021-present

Mercedes-Benz Mercedes S-Class 2021-present 9G-TRONIC Transmission Torque Specifications

Detailed torque specifications for the 9G-Tronic transmission bolts in the 2021-Present Mercedes S-Class. Includes precise values and guidelines for proper installation.

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 components that secure the transmission to the engine block or transmission crossmember.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
These bolts ensure proper alignment and prevent movement that could cause damage to the transmission or surrounding components.

Transmission oil system

This subsystem includes the components that lubricate the transmission.

1

Transmission Oil Pan Bolts

M10 x 1.5
Torque Value
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the oil pan to the transmission case, preventing oil leaks and ensuring the transmission is properly lubricated.
2

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
These plugs allow for the transmission fluid to be drained and filled, and proper torque ensures they are securely sealed to prevent leaks.

Transmission case and valve body

This subsystem includes the components that make up the transmission case and valve body.

1

9G-Tronic Transmission Case Bolts

M12 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the transmission case together, ensuring the internal components are properly aligned and secured. (Estimated value)
2

9G-Tronic Transmission Valve Body Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
These bolts secure the valve body to the transmission case, ensuring proper hydraulic pressure and fluid flow within the transmission. (Estimated value)

Transmission solenoid pack and filter

This subsystem includes the components that control the transmission's hydraulic system and filter the transmission fluid.

1

9G-Tronic Transmission Solenoid Pack Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the solenoid pack to the transmission case, ensuring proper electrical connections and control of the transmission's hydraulic system. (Estimated value)
2

9G-Tronic Transmission Filter Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the transmission filter to the transmission case, ensuring proper filtration of the transmission fluid and preventing contamination. (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 in a 2021-Present Mercedes S-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 housing bolts may require 25 Nm (18 lb-ft). Always refer to the official Mercedes-Benz service manual for precise torque values, as incorrect torque can lead to leaks or component damage.

Q2

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

It is recommended to check the torque on the 9G-TRONIC transmission bolts during routine maintenance or after any repair work involving the transmission. For example, if the transmission pan is removed for a fluid change, the bolts should be re-torqued to the specified values. Regular inspections every 30,000 miles or as per the manufacturer's guidelines are also advisable.

Q3

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

Mercedes-Benz recommends replacing the transmission pan bolts after removal, as they are often designed as single-use torque-to-yield bolts. Reusing them can compromise the integrity of the seal and lead to leaks. Always use new bolts and follow the specified torque sequence during reassembly.

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

Torque Angle Gauge

A tool to measure the angle of rotation during bolt tightening.

  • Digital display for precise readings
  • Compatible with torque wrenches
Learn more

9G-Tronic Transmission Adapter

Specialized adapter for accessing transmission bolts.

  • Fits 9G-Tronic transmission systems
  • Durable construction
Learn more
Service Procedures

9G-Tronic Transmission Bolt Torque Specifications

Detailed steps for applying correct torque to transmission bolts.

  • Ensure the vehicle is on a flat surface and the transmission is cool.
  • Remove the transmission pan to access the bolts.
  • Use a torque wrench to tighten the bolts to the specified torque: 25 Nm (18.4 lb-ft) for M8 bolts and 50 Nm (36.9 lb-ft) for M10 bolts.
  • Use a torque angle gauge to apply an additional 90-degree turn for M8 bolts and 45-degree turn for M10 bolts.
  • Reinstall the transmission pan and ensure all bolts are securely tightened.
View full procedure

Transmission Fluid Replacement

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

  • Drain the old transmission fluid using the drain plug.
  • Replace the drain plug and refill with the recommended fluid type.
  • Use a torque wrench to tighten the drain plug to 25 Nm (18.4 lb-ft).
  • Check the fluid level using the transmission dipstick or diagnostic tool.
View full procedure
Technical Service Bulletins

Incorrect Torque Application on 9G-Tronic Transmission Bolts

2022-05-15

Reports of transmission leaks due to improperly torqued bolts.

2021-Present Mercedes S-Class

Resolution: Follow the updated torque specifications and use a torque angle gauge for proper bolt tightening.

Transmission Fluid Contamination in 9G-Tronic Systems

2023-01-10

Issues with transmission performance due to contaminated fluid.

2021-Present Mercedes S-Class

Resolution: Replace the transmission fluid and ensure the transmission pan is properly sealed with correctly torqued bolts.

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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