Mercedes-Benz Vehicle Models Mercedes GLS 2019-present Torque Specifications
Mercedes-Benz Vehicle Models Mercedes GLS 2019-present

Mercedes-Benz Vehicle Models Mercedes GLS 2019-present Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes GLS 2019-present 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

Convert between different torque units

3.0l I6 Engine

Torque specifications for 3.0L-I6 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
7 ft-lbs (10 N·m)
3

Rocker Arms/Shafts Bolts

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

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 2.0
Torque Specification
65 ft-lbs (88 N·m)
2

Connecting Rod Nuts

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
100 ft-lbs (136 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

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
3

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)

Engine Mounting and Transmission

1

Engine Mounting Bolts

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on engine application.
2

Engine Block to Transmission Bellhousing Bolts

M14 x 2.0
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on engine application.

Timing and Accessory Belt System

1

Timing Belt/Chain Tensioner Bolt

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

Accessory Belt Tensioner Pulley Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 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 1.0
Torque Specification
1. 20 ft-lbs (27 N·m)
Important Notes
Ensure even tightening sequence to prevent leaks.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure even tightening to prevent oil leaks.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the crankshaft.
2

Flywheel Bolts

M10 x 1.0
Torque Specification
1. 70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the flywheel.

Timing And Valves

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper tensioning of the timing belt/chain.
2

Camshaft Sprocket Bolt

M10 x 1.0
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing of the intake manifold.
2

Exhaust Manifold/Headers Bolts

M10 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper sealing of the exhaust manifold.

Lubrication And Cooling

1

Oil Pan Bolts

M8 x 1.0
Torque Specification
9 ft-lbs (9 N·m)
Important Notes
Ensure proper sealing of the oil pan.
2

Water Pump Bolts

M8 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing of the water pump.

4.0l V8 Engine

Torque specifications for 4.0L-V8 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.0
Torque Specification
1. 20 ft-lbs (27 N·m)
Important Notes
Ensure even tightening sequence to prevent leaks.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure even tightening to prevent oil leaks.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the crankshaft.
2

Flywheel Bolts

M10 x 1.0
Torque Specification
1. 70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the flywheel.

Timing And Valves

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper tensioning of the timing belt/chain.
2

Camshaft Sprocket Bolt

M10 x 1.0
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing of the intake manifold.
2

Exhaust Manifold/Headers Bolts

M10 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper sealing of the exhaust manifold.

Lubrication And Cooling

1

Oil Pan Bolts

M8 x 1.0
Torque Specification
9 ft-lbs (9 N·m)
Important Notes
Ensure proper sealing of the oil pan.
2

Water Pump Bolts

M8 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing of the water pump.

9g Tronic Transmission

Torque specifications for 9g 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 specification is given in inch-pounds, which is equivalent to 9 Nm.

Transmission Drain and Fill

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)

Transmission Pan Filter

1

9G-Tronic Transmission Pan Filter Bolt

M10 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value, consult OEM documentation for confirmation.

Transmission Valve Body

1

9G-Tronic Transmission Valve Body Bolt

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value, consult OEM documentation for confirmation.

Transmission Pump Mounting

1

9G-Tronic Transmission Pump Mounting Bolt

M14 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value, consult OEM documentation for confirmation.

Transmission Solenoid Pack

1

9G-Tronic Transmission Solenoid Pack Bolts (2)

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value, consult OEM documentation for confirmation.

Transmission Clutch Pack

1

9G-Tronic Transmission Clutch Pack Bolts (multiple)

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value, consult OEM documentation for confirmation.

Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the fuel tank is properly aligned before tightening.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the filler neck is properly aligned with the fuel tank.

Electrical System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure the battery terminals are clean and free of corrosion before tightening.

Body Panels

1

Body Panel Bolts (e.g., fenders, doors, hood, trunk)

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on typical body panel bolt sizes. Refer to the vehicle's service manual for exact specifications.
2

Door Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on typical door hinge bolt sizes. Refer to the vehicle's service manual for exact specifications.
3

Bumper Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on typical bumper bolt sizes. Refer to the vehicle's service manual for exact specifications.

Interior Components

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on typical seat mounting bolt sizes. Refer to the vehicle's service manual for exact specifications.
2

Interior Trim Fasteners (e.g., dashboard, console)

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical interior trim fastener sizes. Refer to the vehicle's service manual for exact specifications.

Brakes

Torque specifications for Brakes

Brake Caliper and Mounting

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
125 ft-lbs (170 N·m)

Brake Disc/Drum and Hub

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
65 ft-lbs (88 N·m)
2

Brake Rotor to Hub Bolts

M8 x 1.25
Torque Specification
1. 40 ft-lbs (54 N·m) 2. 50 ft-lbs (68 N·m)
Important Notes
Estimated torque value range. Consult vehicle manufacturer's repair manual for accurate information.

Brake Master Cylinder and ABS Module

1

Brake Master Cylinder Mounting Bolts

M6 x 1.0
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque value range. Consult vehicle manufacturer's repair manual for accurate information.
2

ABS Module Mounting Bolts

M5 x 0.8
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated torque value range. Consult vehicle manufacturer's repair manual for accurate information.

Brake Hose and Wheel Lug Nuts

1

Brake Hose Banjo Bolts

M8 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 25 ft-lbs (34 N·m)
Important Notes
Estimated torque value range. Consult vehicle manufacturer's repair manual for accurate information.
2

Wheel Lug Nuts

M14 x 1.5
Torque Specification
110 ft-lbs (150 N·m)

Drivetrain

Torque specifications for Drivetrain

Engine and Flywheel

1

Flywheel Bolts

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Proper torque ensures the flywheel remains securely attached, preventing damage to the engine and transmission.
2

Crankshaft Position Sensor Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures a secure connection, preventing damage to the engine and drivetrain components.
3

Camshaft Position Sensor Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures a secure connection, preventing damage to the engine and drivetrain components.

Transmission and Mounts

1

Transmission Mounting Bolts

M14 x 2.0
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque ensures the transmission remains securely attached to the engine and chassis.
2

Transmission Oil Pan Bolts

M10 x 1.5
Torque Specification
80 in-lbs (9 N·m)
Important Notes
Proper torque ensures the oil pan remains securely attached to the transmission.
3

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque ensures a secure seal, preventing leaks and damage to the drivetrain components.

Driveshaft and Axles

1

Propeller/Drive Shaft Bolts

M14 x 2.0
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Proper torque ensures a secure connection, preventing damage to the drivetrain components.
2

CV Joint/Axle Nut

M20 x 2.5
Torque Specification
180 ft-lbs (244 N·m)
Important Notes
Proper torque ensures the CV joint remains securely attached to the driveshaft.
3

Drive Axle/Half Shaft Bolts

M14 x 2.0
Torque Specification
125 ft-lbs (170 N·m)
Important Notes
Proper torque ensures a secure connection, preventing damage to the drivetrain components.
4

Driveshaft Center Bearing Bolts

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque ensures the center bearing remains securely attached to the driveshaft.

Differential and Transfer Case

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Proper torque ensures a secure seal, preventing leaks and damage to the drivetrain components.
2

Transfer Case Drain/Fill Plug

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque ensures a secure seal, preventing leaks and damage to the drivetrain components.
3

Differential Cover Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures the differential cover remains securely attached to the differential.

Transmission Cooler Lines

1

Transmission Cooler Line Fittings

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures a secure connection, preventing leaks and damage to the drivetrain components.

Electrical

Torque specifications for Electrical

Alternator And Starter System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
2

Starter Motor Mounting Bolts

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

Battery And Terminal System

1

Battery Terminal Nuts

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

Ignition And Fuel System

1

Ignition Coil Mounting Bolts

M10 x 1.5
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value, may vary depending on specific application and manufacturer's recommendations.
2

Fuel Pump Electrical Connector Bolts

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value, may vary depending on specific application and manufacturer's recommendations.
3

A/C Compressor Electrical Connector Bolts

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value, may vary depending on specific application and manufacturer's recommendations.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the EGR valve gasket is properly seated before tightening.

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Follow the manufacturer's torque sequence to avoid warping the manifold.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

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

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the gasket is properly seated before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

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

Emissions Sensors

1

Oxygen Sensor (O2 Sensor) Mounting Bolts

M6 x 1.0
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the sensor is properly aligned before tightening.
2

NOx Sensor Mounting Bolts

M6 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the sensor is properly aligned before tightening.
3

Exhaust Gas Temperature Sensor Mounting Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor is properly aligned before tightening.

Diesel Particulate Filter

1

DPF Mounting Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Follow the manufacturer's torque sequence to avoid damaging the DPF.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2

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.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly aligned before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly aligned before tightening.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly aligned before tightening.

Exhaust Accessories

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on typical heat shield bolt sizes.
2

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on typical hanger bolt sizes.
3

Oxygen Sensor Bolts

M12 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure sensor is properly aligned before tightening.
4

Exhaust Flange Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly aligned before tightening.

Fuel

Torque specifications for Fuel

Fuel Rail and Injector System

1

Fuel Rail Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 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 (10 N·m)
Important Notes
Correct torque ensures the injectors are properly seated and functioning correctly.
3

Fuel Injector Rail Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Proper torque is necessary to maintain fuel system integrity.

Fuel Pump and Tank System

1

Fuel Pump Mounting Bolts

M10 x 1.5
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Correct torque is essential to prevent fuel pump failure or fuel leaks.
2

Fuel Tank Strap Bolts

M12 x 1.75
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Proper torque ensures the fuel tank is securely fastened and prevents damage or fuel leaks.

Fuel Filler and Filter System

1

Fuel Filler Neck Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Correct torque is necessary to prevent fuel leaks or spills.
2

Fuel Filter Bolt/Nut

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

Estimated Torque Specifications

1

Fuel Pressure Regulator Mounting Bolts

M8 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 12 ft-lbs (16 N·m)
Important Notes
Estimated torque value. Consult the vehicle's repair manual or manufacturer's documentation for accurate torque specifications.
2

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 value. Consult the vehicle's repair manual or manufacturer's documentation for accurate torque specifications.
3

Fuel Injector O-Ring or Gasket Bolts

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

Hvac

Torque specifications for Hvac

Air Conditioning System

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Proper torque is essential to prevent damage to the compressor and surrounding components.
2

A/C Line Fittings

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures a leak-tight seal, preventing refrigerant leaks and maintaining system performance.
3

A/C Condenser Mounting Bolts

M12 x 1.75
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on industry standards. Consult manufacturer's recommendations or a repair manual for specific torque values.
4

A/C Evaporator Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards. Consult manufacturer's recommendations or a repair manual for specific torque values.
5

A/C Refrigerant Line Clamp Bolts

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value based on industry standards. Consult manufacturer's recommendations or a repair manual for specific torque values.
6

A/C Orifice Tube Fittings

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards. Consult manufacturer's recommendations or a repair manual for specific torque values.

Suspension

Torque specifications for Suspension

Strut Shock Absorber

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
2

Coil Spring Mounting Bolts

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value based on industry standards for similar applications.

Control Arm

1

Control Arm Bolts

M16 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
2

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards for similar applications.
3

Lower Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards for similar applications.

Steering

1

Steering Gear Mounting Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Estimated value based on industry standards for similar applications.
2

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)

Sway Bar

1

Sway Bar Link Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
2

Ball Joint Nut

M12 x 1.25
Torque Specification
60 ft-lbs (81 N·m)

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 recommended torque spec for the lug nuts on a 2022 Mercedes GLS?

140 Nm (103 lb-ft)

Q2

What tools do I need to properly torque the lug nuts on my Mercedes GLS?

A torque wrench that IS calibrated to the specified torque value and a 19mm socket.

Q3

How often should I torque the lug nuts on my Mercedes GLS?

It IS recommended to torque the lug nuts every 6-12 months, or more frequently if you experience any unusual vibrations or noises coming from your wheels.

Q4

What are the consequences of not properly torquing the lug nuts on my Mercedes GLS?

Improperly torqued lug nuts can lead to loose wheels, which can be extremely dangerous. In addition, over-torquing the lug nuts can damage the wheel studs or the threads on the lug nuts.

Q5

Can I use an impact wrench to torque the lug nuts on my Mercedes GLS?

No, an impact wrench should never be used to torque lug nuts. Impact wrenches can over-tighten the lug nuts, which can damage the wheel studs or the threads on the lug nuts.

Q6

What IS the torque spec for the oil drain plug on a 2021 Mercedes GLS?

30 Nm (22 lb-ft)

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 gls.

  • 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 Cylinder Head Bolts

Step-by-step procedure for tightening engine cylinder head bolts to specified torque

  • Locate the cylinder head bolts.
  • Clean the bolt threads and apply a small amount of thread sealant.
  • Tighten the bolts to 25 Nm in stages.
  • Retorque the bolts to 50 Nm plus 90 degrees.
  • Safety considerations and warnings
  • Specific instructions for this component.
View full procedure

Suspension Control Arm Bolts

Detailed procedure for tightening suspension control arm bolts to specified torque.

  • Locate the suspension control arm bolts.
  • Clean the bolt threads and apply a small amount of thread locker.
  • Tighten the bolts to 100 Nm.
  • Safety considerations and warnings
  • Specific instructions for this component.
View full procedure

Brake Caliper Bolts

Technical procedure for tightening brake caliper bolts to specified torque.

  • Locate the brake caliper bolts.
  • Clean the bolt threads and apply a small amount of anti-seize.
  • Tighten the bolts to 50 Nm.
  • Safety considerations and warnings
  • Specific instructions for this component.
View full procedure
Technical Service Bulletins

TSB: Engine Oil Cooler Leak

2023-03-15

Technical bulletin addressing an issue with oil cooler leaks on gls models.

2019-2021 gls

Resolution: Replace the engine oil cooler with an updated version.

TSB: Transmission Fluid Contamination

2022-09-12

Technical bulletin outlining a procedure for addressing transmission fluid contamination on certain gls models.

2020-2022 gls

Resolution: Flush the transmission fluid and replace the filter.

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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.
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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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