Mercedes-Benz Mercedes G-Class 2018-present Drivetrain Bolt Torque Specifications
Comprehensive torque specifications for the drivetrain bolts of the 2018-Present Mercedes G-Class, including axle, driveshaft, and differential bolts.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
Engine block and crankshaft
Components that secure the crankshaft in place and maintain engine operation.
1 Main Bearing Bolts
M14 x 1.5
Main Bearing Bolts
M14 x 1.5Torque Value
2 Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5
Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5Torque Value
Connecting rods
Components that maintain the integrity of the engine's reciprocating assembly.
1 Connecting Rod Nuts
M12 x 1.25
Connecting Rod Nuts
M12 x 1.25Torque Value
Flywheel and transmission
Components that secure the flywheel to the crankshaft and transmission to the engine and chassis.
1 Flywheel Bolts
M14 x 1.5
Flywheel Bolts
M14 x 1.5Torque Value
2 Transmission Mounting Bolts
M12 x 1.25
Transmission Mounting Bolts
M12 x 1.25Torque Value
3 Engine Block to Transmission Bellhousing Bolts
M16 x 1.5
Engine Block to Transmission Bellhousing Bolts
M16 x 1.5Torque Value
Important Notes
Driveshaft and axles
Components that secure the driveshaft and axles to the transmission and differential.
1 Drive Axle/Half Shaft Bolts
M18 x 1.5
Drive Axle/Half Shaft Bolts
M18 x 1.5Torque Value
2 CV Joint/Axle Nut
M20 x 1.5
CV Joint/Axle Nut
M20 x 1.5Torque Value
3 Propeller/Drive Shaft Bolts
M16 x 1.5
Propeller/Drive Shaft Bolts
M16 x 1.5Torque Value
Differential and transfer case
Components that secure the differential and transfer case to the chassis and maintain proper fluid reservoirs.
1 Differential Drain/Fill Plug
M12 x 1.25
Differential Drain/Fill Plug
M12 x 1.25Torque Value
2 Transfer Case Drain/Fill Plug
M10 x 1.25
Transfer Case Drain/Fill Plug
M10 x 1.25Torque Value
3 Differential Cover Bolts
M12 x 1.25
Differential Cover Bolts
M12 x 1.25Torque Value
Important Notes
4 Transfer Case Mounting Bolts
M14 x 1.5
Transfer Case Mounting Bolts
M14 x 1.5Torque Value
Important Notes
Driveshaft and axle supports
Components that secure the driveshaft center bearing and transmission crossmember to the chassis.
1 Driveshaft Center Bearing Bolts
M14 x 1.5
Driveshaft Center Bearing Bolts
M14 x 1.5Torque Value
Important Notes
2 Transmission Crossmember Bolts
M16 x 1.5
Transmission Crossmember Bolts
M16 x 1.5Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 drivetrain bolts on a 2018-Present Mercedes G-Class?
What are the torque specifications for the drivetrain bolts on a 2018-Present Mercedes G-Class?
The torque specifications for drivetrain bolts vary depending on the specific component. For example, the driveshaft bolts typically require 50-60 Nm (37-44 lb-ft), while the differential mounting bolts may require 80-100 Nm (59-74 lb-ft). Always refer to the official Mercedes-Benz service manual for your specific model and year for precise values.
Q2 How often should I check the torque on drivetrain bolts?
How often should I check the torque on drivetrain bolts?
It is recommended to check the torque on drivetrain bolts during routine maintenance intervals, such as every 20,000 miles or after any significant drivetrain work. Additionally, inspect them if you notice unusual vibrations, noises, or after off-road driving, as these conditions can loosen bolts over time.
Q3 Can I reuse drivetrain bolts, or should they be replaced?
Can I reuse drivetrain bolts, or should they be replaced?
Drivetrain bolts are often designed for single use, especially if they are torque-to-yield (TTY) bolts. Reusing them can compromise their integrity and lead to failure. Always check the manufacturer's guidelines and replace bolts if there is any doubt about their condition or if they have been previously torqued to yield.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 drivetrain bolts.
- Adjustable torque settings
- LCD display for real-time torque readings
Torque Angle Gauge
Used to measure the angle of rotation when applying torque to bolts.
- Magnetic base for easy attachment
- Digital angle measurement
Impact Wrench
A power tool for quickly loosening or tightening bolts.
- High torque output
- Variable speed control
Service Procedures
Drivetrain Bolt Torque Specification Application
Procedure to apply the correct torque to drivetrain bolts on a 2018-Present Mercedes G-Class.
- Ensure the vehicle is on a flat surface and the parking brake is engaged.
- Locate the drivetrain bolts requiring torque application.
- Set the digital torque wrench to the specified torque value for the drivetrain bolts (refer to the manufacturer's specifications).
- Apply torque to each bolt in a crisscross pattern to ensure even distribution.
- Use a torque angle gauge to verify the angle of rotation if required.
- Double-check all bolts to ensure they are properly torqued.
Drivetrain Bolt Inspection and Replacement
Procedure to inspect and replace worn or damaged drivetrain bolts.
- Inspect all drivetrain bolts for signs of wear, corrosion, or damage.
- Remove any damaged bolts using an impact wrench.
- Clean the bolt threads and mounting surfaces before installing new bolts.
- Apply the correct torque to the new bolts using a digital torque wrench.
- Verify the torque with a torque angle gauge if necessary.
Technical Service Bulletins
Drivetrain Bolt Torque Specification Update
2021-03-15Updated torque specifications for drivetrain bolts on 2018-Present Mercedes G-Class models.
Resolution: Refer to the updated torque specifications in the service manual and ensure all bolts are torqued to the new values.
Drivetrain Bolt Corrosion Issue
2020-07-22Reports of drivetrain bolt corrosion leading to loosening or failure.
Resolution: Inspect all drivetrain bolts for corrosion and replace as necessary. Apply anti-corrosion coating to new bolts during installation.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.