Mercedes-Benz Vehicle Models Mercedes G-Class 1979-2018 Torque Specifications
Mercedes-Benz Vehicle Models Mercedes G-Class 1979-2018

Mercedes-Benz Vehicle Models Mercedes G-Class 1979-2018 Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes G-Class 1979-2018 torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly 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

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Torque Calculator

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2.9l I5 Engine

Torque specifications for 2.9L-I5 Engine

Cylinder Head and Valve Train

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
2

Valve Cover Bolts

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 2.0
Torque Specification
60 ft-lbs (81 N·m)
2

Connecting Rod Nuts

M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
80 ft-lbs (108 N·m)

Engine Accessories

1

Oil Pan Bolts

M10 x 1.5
Torque Specification
80 in-lbs (9 N·m)
Important Notes
Estimated value, may vary depending on engine application.
2

Water Pump Bolts

M12 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
3

Fuel Injector Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (9 N·m)

Engine Mounting and Transmission

1

Engine Mounting Bolts

M14 x 2.0
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value, may vary depending on engine application.
2

Engine Block to Transmission Mounting Bolts

M16 x 2.0
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on engine application.

4.0l Engine

Torque specifications for 4.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence for the cylinder head bolts. Failure to do so may result in head warping or leaks.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Follow the specified torque sequence to ensure proper crankshaft alignment.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the intake manifold gasket is properly seated before tightening.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the exhaust manifold gasket is properly seated before tightening.

Accessories

1

Alternator Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the alternator is properly aligned with the drive belt.
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the starter motor is properly aligned with the flywheel.

4.0l V8 Engine

Torque specifications for 4.0L-V8 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence for the cylinder head bolts. Failure to do so may result in head warping or leaks.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Follow the specified torque sequence to ensure proper crankshaft alignment.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the intake manifold gasket is properly seated before tightening.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the exhaust manifold gasket is properly seated before tightening.

Accessories

1

Alternator Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the alternator is properly aligned with the drive belt.
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the starter motor is properly aligned with the flywheel.

5.5l Engine

Torque specifications for 5.5L Engine

Cylinder Head and Engine Block

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
2

Engine Block Cylinder Head Gasket Bolt Warp Patterns

M12 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 90° 3. 20 ft-lbs (27 N·m)
Important Notes
Estimated values, consult manufacturer's documentation for verification.

Main Bearing and Crankshaft

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)

Valvetrain and Timing

1

Valve Cover Bolts

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
2

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
3

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)

Intake and Exhaust

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
3

Throttle Body Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)

Fuel System

1

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
2

Fuel Rail Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
3

Oil Filter Housing Filter Bypass Valve Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated values, consult manufacturer's documentation for verification.

Cooling System

1

Water Pump Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)

Electrical System

1

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)

5.5l V8 Engine

Torque specifications for 5.5L-V8 Engine

Cylinder Head and Engine Block

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
2

Engine Block Cylinder Head Gasket Bolt Warp Patterns

M12 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 90° 3. 20 ft-lbs (27 N·m)
Important Notes
Estimated values, consult manufacturer's documentation for verification.

Main Bearing and Crankshaft

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)

Valvetrain and Timing

1

Valve Cover Bolts

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
2

Timing Belt/Chain Tensioner Bolt

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
3

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)

Intake and Exhaust

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
3

Throttle Body Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)

Fuel System

1

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
2

Fuel Rail Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
3

Oil Filter Housing Filter Bypass Valve Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated values, consult manufacturer's documentation for verification.

Cooling System

1

Water Pump Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)

Electrical System

1

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)

5g Tronic Transmission

Torque specifications for 5g Tronic Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
80 in-lbs (9 N·m)
Important Notes
Note: The torque value is specified in inch-pounds (in-lbs) instead of foot-pounds (ft-lbs).

Transmission Drain and Fill

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)

5G Tronic Transmission Case

1

5G-Tronic Transmission Case Bolts

M16 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated value based on industry standards for similar transmission cases.

5G Tronic Transmission Valve Body

1

5G-Tronic Transmission Valve Body Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on industry standards for similar valve bodies.

5G Tronic Transmission Solenoid Pack

1

5G-Tronic Transmission Solenoid Pack Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on industry standards for similar solenoid packs.

5G Tronic Transmission Filter

1

5G-Tronic Transmission Filter Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards for similar transmission filters.

7g Tronic Transmission

Torque specifications for 7g Tronic Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening.

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
6.7 ft-lbs (9 N·m)
Important Notes
Use a torque wrench calibrated for low torque values to avoid overtightening.

Fluid Management

1

Transmission Drain Plug

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Replace the sealing washer or O-ring during installation.
2

Transmission Fill Plug

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Replace the sealing washer or O-ring during installation.
3

Transmission Cooler Line Fittings

M14 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment of the cooler lines to avoid cross-threading.

Driveline Connection

1

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Use thread locker as specified by the manufacturer.
2

Transmission Output Shaft Flange Bolts

M10 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure proper alignment of the output shaft flange.

Internal Components

1

Torque Converter Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the torque converter is fully seated before tightening.
2

Transmission Valve Body Bolts

M6 x 1.0
Torque Specification
6.7 ft-lbs (9 N·m)
Important Notes
Use a torque wrench calibrated for low torque values to avoid overtightening.

Body

Torque specifications for Body

Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secure the strut/shock absorber to the vehicle's body.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Attach the control arms to the vehicle's body.
3

Ball Joint Nut

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secure the ball joint to the control arm.
4

Tie Rod End Nut

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Attach the tie rod end to the steering knuckle.
5

Sway Bar Link Nut

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Secure the sway bar link to the sway bar.

Body Mounts

1

Body Mount Bolts

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Secure the vehicle's body to the frame.

Doors and Hood

1

Door Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Attach the door hinges to the vehicle's body.
2

Hood Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Secure the hood hinges to the vehicle's body.
3

Trunk Lid Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Attach the trunk lid hinges to the vehicle's body.

Bumper

1

Bumper Mounting Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Secure the bumper to the vehicle's body.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure the caliper is properly aligned before torquing.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Ensure the bracket is properly seated before torquing.

Brake Disc Drum

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure the disc/drum is properly seated on the hub before torquing.

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the sealing washers are properly seated before torquing.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the master cylinder is properly aligned before torquing.

Brake Booster

1

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the booster is properly aligned before torquing.

Brake Pedal

1

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the pedal assembly is properly aligned before torquing.

Abs System

1

ABS Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure the sensor is properly seated before torquing.

Wheel Assembly

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
110 ft-lbs (150 N·m)
Important Notes
Torque the lug nuts in a star pattern to ensure even clamping force.

Drivetrain

Torque specifications for Drivetrain

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Proper torque is essential to prevent bearing damage and ensure engine longevity.
2

Connecting Rod Nuts

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque is necessary to maintain the correct clearance and prevent engine damage.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Proper torque is necessary to prevent pulley or balancer damage and ensure smooth engine operation.

Flywheel and Transmission

1

Flywheel Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Proper torque is essential to prevent flywheel damage and ensure smooth engine operation.
2

Transmission Mounting Bolts

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque is essential to prevent transmission damage and ensure smooth operation.
3

Transmission Oil Pan Bolts

M10 x 1.0
Torque Specification
80 inch-lbs (9 N·m)
Important Notes
Proper torque is necessary to prevent oil leaks and ensure smooth transmission operation.

Drive Axles and Half Shafts

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Proper torque is essential to prevent axle or shaft damage and ensure smooth power delivery.
2

CV Joint/Axle Nut

M18 x 1.5
Torque Specification
180 ft-lbs (244 N·m)
Important Notes
Proper torque is necessary to prevent CV joint or axle damage and ensure smooth power delivery.
3

Drive Axle/Half Shaft Nut (at the wheel hub)

M18 x 1.5
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
Proper torque is essential to prevent axle or shaft damage and ensure smooth power delivery.

Differential and Transfer Case

1

Differential Drain/Fill Plug

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque is necessary to prevent plug damage and ensure smooth differential operation.
2

Transfer Case Drain/Fill Plug

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque is necessary to prevent plug damage and ensure smooth transfer case operation.
3

Differential Cover Bolts

M10 x 1.0
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque is essential to prevent cover damage and ensure smooth differential operation.

Engine Block to Transmission Bellhousing

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque is essential to prevent engine or transmission damage and ensure smooth operation.

Transmission Crossmember

1

Transmission Crossmember Bolts

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Proper torque is necessary to prevent crossmember damage and ensure smooth transmission operation.

Transfer Case Mounting

1

Transfer Case Mounting Bolts

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque is necessary to prevent transfer case damage and ensure smooth operation.

Propeller/Drive Shaft

1

Propeller/Drive Shaft Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Proper torque is essential to prevent shaft damage and ensure smooth power delivery.

Electrical

Torque specifications for Electrical

Alternator And Starter

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
2

Starter Motor Mounting Bolts

M12 x 1.75
Torque Specification
30 ft-lbs (41 N·m)

Battery And Terminals

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)

Ignition And Fuel Systems

1

Ignition Coil Bracket Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on general industry practices.
2

Fuel Pump Electrical Connector Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value based on general industry practices.

A/C System

1

A/C Compressor Electrical Connector Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value based on general industry practices.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the EGR valve gasket is properly seated before tightening.

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Follow the manufacturer's recommended torque sequence to avoid warping the manifold.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the gasket is properly aligned before tightening.

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use a new gasket to ensure a proper seal.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening.

Emissions Sensors

1

Oxygen Sensor (Lambda Sensor) Mounting

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on similar sensor mounting bolts. Ensure the sensor is properly seated before tightening.
2

NOx Sensor Mounting

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on similar sensor mounting bolts. Ensure the sensor is properly seated before tightening.
3

Exhaust Gas Temperature Sensor Mounting

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar sensor mounting bolts. Ensure the sensor is properly seated before tightening.

Diesel Particulate Filter

1

DPF Mounting Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar mounting bolts. Follow the manufacturer's torque sequence.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure gasket is properly seated before tightening.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure gasket is properly seated before tightening.

Muffler

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure gasket is properly seated before tightening.

Exhaust Hangers

1

Exhaust Hanger Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on typical M6 bolt torque specifications.

Oxygen Sensors

1

Oxygen Sensor Bolts

M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the sensor is properly seated before tightening.

Heat Shields

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on typical M6 bolt torque specifications.

Exhaust Flanges

1

Exhaust Flange Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly seated before tightening.

Fuel

Torque specifications for Fuel

Fuel Rail and Injector System

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Incorrect torque can lead to poor engine performance, decreased fuel efficiency, and potential engine damage.
3

Fuel Injector Rail Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.

Fuel Pump and Tank System

1

Fuel Pump Mounting Bolts

M12 x 1.75
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.
2

Fuel Tank Strap Bolts

M14 x 2.0
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque is essential to maintain fuel tank integrity and prevent fuel spills.
3

Fuel Filler Neck Bolts

M12 x 1.75
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque is essential to maintain fuel tank integrity and prevent fuel spills.

Fuel Filter and Pressure Regulator System

1

Fuel Filter Bolt/Nut

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque is essential to maintain fuel system integrity and prevent fuel leaks.
2

Fuel Pressure Regulator Mounting Bolts

M8 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated torque values. Consult the vehicle manufacturer's recommendations or the component manufacturer's specifications for accurate torque values.

Fuel Line and Fitting System

1

Fuel Line Fittings

M10 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated torque values. Consult the vehicle manufacturer's recommendations or the component manufacturer's specifications for accurate torque values.

Fuel Injector O Ring or Gasket System

1

Fuel Injector O-Ring or Gasket Bolts

M6 x 1.0
Torque Specification
1. 5 ft-lbs (7 N·m) 2. 10 ft-lbs (14 N·m)
Important Notes
Estimated torque values. Consult the vehicle manufacturer's recommendations or the component manufacturer's specifications for accurate torque values.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute load.
2

A/C Line Fittings

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure fittings are clean and free of debris before tightening.

Evaporator

1

Evaporator Housing Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value based on similar M6 bolts in HVAC systems.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value based on similar M6 bolts in HVAC systems.

Heater Core

1

Heater Core Inlet/Outlet Fittings

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar M8 fittings in HVAC systems.

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on similar M8 bolts in HVAC systems.

Control Panel

1

HVAC Control Panel Mounting Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value based on similar M5 screws in HVAC systems.

Suspension

Torque specifications for Suspension

Strut And Shock Absorber

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Proper torque is crucial to prevent damage to the strut/shock absorbers and maintain ride quality.
2

Coil Spring Mounting Bolts

M12 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Proper torque is crucial to ensure the coil springs function correctly, providing stable ride quality and handling.

Control Arm

1

Control Arm Bolts

M16 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Proper torque ensures the control arms function correctly, providing stable handling and ride quality.
2

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque is crucial to ensure the bushings function correctly, providing stable handling and ride quality.
3

Lower Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque is crucial to ensure the bushings function correctly, providing stable handling and ride quality.

Steering

1

Steering Knuckle Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Proper torque is crucial to ensure the steering knuckle functions correctly, providing stable steering and handling.
2

Tie Rod End Nut

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures the tie rod end functions correctly, providing stable steering and handling.

Sway Bar

1

Sway Bar Link Nut

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures the sway bar link functions correctly, providing stable handling and ride quality.

Ball Joint

1

Ball Joint Nut

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Proper torque prevents the ball joint from coming loose, which could lead to uneven tire wear and compromised handling.

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 IS the correct torque specification for the cylinder head bolts on a 1995 Mercedes G-Class?

The cylinder head bolts on a 1995 Mercedes G-Class should be torqued to 120 Nm (89 ft-lbs) in three stages: 50 Nm (37 ft-lbs), 80 Nm (59 ft-lbs), and then the final torque of 120 Nm (89 ft-lbs).

Q2

What IS the recommended torque setting for the spark plugs on a 2018 Mercedes G-Class?

The spark plugs on a 2018 Mercedes G-Class should be torqued to 25 Nm (18 ft-lbs) using a calibrated torque wrench.

Q3

How can I prevent overtightening bolts when performing maintenance on my Mercedes G-Class?

To prevent overtightening bolts, use a calibrated torque wrench and follow the recommended torque specifications provided in the vehicle's service manual. Additionally, avoid using impact wrenches or excessive force.

Q4

What tools do I need to properly torque bolts on my Mercedes G-Class?

To properly torque bolts on a Mercedes G-Class, you will need a calibrated torque wrench that meets or exceeds the accuracy requirements specified in the vehicle's service manual. You may also need specific socket attachments or adapters depending on the location and size of the bolts you are tightening.

Q5

When should I retorque bolts on my Mercedes G-Class?

Critical bolts, such as those on the cylinder head or suspension, should be retorqued after a specific period or mileage, as specified in the vehicle's service manual. Re-torquing ensures proper tension and prevents loosening due to factors like heat cycling and vibration.

Q6

Can I use aftermarket or generic bolts and torque specifications for my Mercedes G-Class?

No, it IS not recommended to use aftermarket or generic bolts and torque specifications for your Mercedes G-Class. Using non-genuine bolts or incorrect torque values can compromise the integrity and safety of your vehicle's components.

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 (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the g-class.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more
Service Procedures

Engine Bolt Torque Specifications

Technical procedure for tightening engine bolts to precise torque specifications on the g-class.

  • Locate the engine bolts that need to be tightened.
  • Use the digital torque wrench to tighten the bolts to the specified torque.
  • Follow the recommended torque sequence to ensure proper tightening.
  • Safety precautions: Wear appropriate safety gear, and ensure the engine IS cool before performing this procedure.
View full procedure

Suspension Bolt Torque Specifications

Technical procedure for tightening suspension bolts to precise torque specifications on the g-class.

  • Locate the suspension bolts that need to be tightened.
  • Use the digital torque wrench to tighten the bolts to the specified torque.
  • Follow the recommended torque sequence to ensure proper tightening.
  • Safety precautions: Wear appropriate safety gear, and ensure the vehicle IS on a level surface before performing this procedure.
View full procedure

Brake Bolt Torque Specifications

Technical procedure for tightening brake bolts to precise torque specifications on the g-class.

  • Locate the brake bolts that need to be tightened.
  • Use the digital torque wrench to tighten the bolts to the specified torque.
  • Follow the recommended torque sequence to ensure proper tightening.
  • Safety precautions: Wear appropriate safety gear, and ensure the vehicle IS on a level surface before performing this procedure.
View full procedure
Technical Service Bulletins

TSB: Revised Torque Specifications for Engine Head Bolts

2005-05-12

This bulletin provides revised torque specifications for the engine head bolts on certain models of the g-class.

1998-2005 g-class (W463)

Resolution: Follow the revised torque specifications as outlined in the bulletin to ensure proper engine head bolt tightening.

TSB: Updated Torque Specifications for Front Suspension Components

2010-07-27

This bulletin provides updated torque specifications for the front suspension components on certain models of the g-class.

2006-2018 g-class (W463)

Resolution: Follow the updated torque specifications as outlined in the bulletin to ensure proper front suspension component tightening.

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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.
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About the Author

Expert automotive knowledge and experience

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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