Mercedes-Benz Vehicle Models Mercedes C-Class 2007-2014 Torque Specifications
Mercedes-Benz Vehicle Models Mercedes C-Class 2007-2014

Mercedes-Benz Vehicle Models Mercedes C-Class 2007-2014 Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes C-Class 2007-2014 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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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

1.8l I4 Engine

Torque specifications for 1.8L-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's torque sequence for proper sealing. Estimated bolt size based on typical cylinder head bolts.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated bolt size based on typical camshaft bearing cap bolts.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated bolt size based on typical main bearing bolts.
2

Flywheel Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure the flywheel is properly aligned before tightening.

Valvetrain

1

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Estimated bolt size based on typical rocker arm bolts.
2

Valve Cover Bolts

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

Lubrication System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
2

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated bolt size based on typical oil filter housing bolts.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the water pump gasket is properly seated before tightening.
2

Thermostat Housing Bolts

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

2.1l I4 Engine

Torque specifications for 2.1L-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Main Bearing

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
20 ft-lbs (27 N·m)

Connecting Rod

1

Connecting Rod Nuts

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

Flywheel

1

Flywheel Bolts

M16 x 1.5
Torque Specification
60 ft-lbs (81 N·m)

Oil Pan

1

Oil Pan Bolts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)

Valve Cover

1

Valve Cover Bolts

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

Timing Belt Chain

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Camshaft Sprocket

1

Camshaft Sprocket Bolt

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

Crankshaft Pulley

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
81 ft-lbs (110 N·m)

Throttle Body

1

Throttle Body Bolts

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

Intake Manifold

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
9 ft-lbs (12 N·m)

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Spark Plugs

1

Spark Plug Bolts

M14 x 1.25
Torque Specification
22 ft-lbs (30 N·m)

Rocker Arms

1

Rocker Arms/Shafts Bolts

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

Fuel Injector

1

Fuel Injector Bolts

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

Fuel Rail

1

Fuel Rail Bolts

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

Oil Filter Housing

1

Oil Filter Housing Bolt

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Oil Drain Plug

1

Oil Drain Plug Bolt

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

Engine Mounting

1

Engine Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on general engine assembly practices.

Crankshaft Position Sensor

1

Crankshaft Position Sensor Bolt

M10 x 1.5
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on general engine assembly practices.

Camshaft Position Sensor

1

Camshaft Position Sensor Bolt

M10 x 1.5
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on general engine assembly practices.

Engine Block To Transmission

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on general engine assembly practices.

3.0l Engine

Torque specifications for 3.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence. Final torque is achieved by turning the bolts an additional 90 degrees.
2

Valve Cover Bolts

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

Crankshaft And Bearings

1

Main Bearing Bolts

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

Connecting Rod Nuts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the connecting rod caps are properly aligned before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

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

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Follow the manufacturer's specified torque sequence.
2

Exhaust Manifold Bolts

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

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the fuel rail is properly aligned before tightening.
2

Fuel Injector Bolts

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

3.0l V6 Engine

Torque specifications for 3.0L-V6 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence. Final torque is achieved by turning the bolts an additional 90 degrees.
2

Valve Cover Bolts

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

Crankshaft And Bearings

1

Main Bearing Bolts

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

Connecting Rod Nuts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the connecting rod caps are properly aligned before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

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

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Follow the manufacturer's specified torque sequence.
2

Exhaust Manifold Bolts

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

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the fuel rail is properly aligned before tightening.
2

Fuel Injector Bolts

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

5g Tronic Transmission

Torque specifications for 5g Tronic Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
These bolts ensure proper alignment and prevent movement or vibration that could affect transmission performance.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
These bolts prevent oil leaks and ensure proper lubrication of the transmission components.

Transmission Fluid System

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
These plugs ensure a leak-free seal when draining and filling the transmission fluid.
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
This plug ensures a leak-free seal when draining and filling the transmission fluid.

Transmission Pan Gasket

1

Transmission Pan Gasket Bolts

M10 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value. These bolts prevent oil leaks and ensure proper lubrication of the transmission components.

Transmission Filter

1

Transmission Filter Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value. These bolts ensure proper filtration of the transmission fluid.

Transmission Cooler Line Fittings

1

Transmission Cooler Line Fittings

M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated value. These fittings ensure a leak-free seal when connecting the transmission cooler lines.

Torque Converter

1

Torque Converter Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. These bolts ensure proper engagement and disengagement of the torque converter.

7g Tronic Transmission

Torque specifications for 7g Tronic Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)

Transmission Fluid System

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
29 ft-lbs (39 N·m)
2

Transmission Fluid Drain/Fill Plug

M12 x 1.5
Torque Specification
29 ft-lbs (39 N·m)

7G Tronic Transmission Pan

1

7G-Tronic Transmission Pan Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on general knowledge of the 7G-Tronic transmission.

7G Tronic Transmission Filter

1

7G-Tronic Transmission Filter Bolts

M6 x 1
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on general knowledge of the 7G-Tronic transmission.

7G Tronic Transmission Solenoid Pack

1

7G-Tronic Transmission Solenoid Pack Bolts

M6 x 1
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on general knowledge of the 7G-Tronic transmission.

7G Tronic Transmission Valve Body

1

7G-Tronic Transmission Valve Body Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on general knowledge of the 7G-Tronic transmission.

7G Tronic Transmission Torque Converter

1

7G-Tronic Transmission Torque Converter Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on general knowledge of the 7G-Tronic transmission.

Body

Torque specifications for Body

Suspension And Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
2

Control Arm Bolts

M12 x 1.25
Torque Specification
48 ft-lbs (65 N·m)
3

Ball Joint Nut

M16 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
4

Tie Rod End Nut

M14 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
5

Sway Bar Link Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
6

Steering Gear/Rack Bolts

M16 x 1.5
Torque Specification
74 ft-lbs (100 N·m)

Body And Frame

1

Body Mounting Bolts

M14 x 1.5 (estimated)
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Consult manufacturer documentation for accurate information.
2

Door Hinge Bolts

M10 x 1.25 (estimated)
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value. Consult manufacturer documentation for accurate information.
3

Hood Hinge Bolts

M10 x 1.25 (estimated)
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value. Consult manufacturer documentation for accurate information.
4

Trunk Lid Hinge Bolts

M10 x 1.25 (estimated)
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value. Consult manufacturer documentation for accurate information.
5

Bumper Mounting Bolts

M12 x 1.25 (estimated)
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Consult manufacturer documentation for accurate information.

Brakes

Torque specifications for Brakes

Brake Caliper and Mounting

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.5
Torque Specification
81 ft-lbs (110 N·m)

Brake Disc/Drum and Wheel

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
2

Wheel Lug Nuts

M14 x 1.5
Torque Specification
96 ft-lbs (130 N·m)

Brake Master Cylinder and Booster

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.

ABS Module and Brake Lines

1

ABS Module Mounting Bolts

M6 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.
2

Brake Line Fittings

M10 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value based on general industry standards.

Drivetrain

Torque specifications for Drivetrain

Engine

1

Flywheel Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Securely attach flywheel to crankshaft.
2

Main Bearing Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Properly seat main bearings on engine block.
3

Connecting Rod Nuts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Securely attach connecting rods to crankshaft.

Transmission

1

Transmission Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Securely attach transmission to engine and chassis.
2

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Securely attach oil pan to transmission.

Driveshaft and Axles

1

Drive Axle/Half Shaft Bolts

M12 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Securely attach axles to transmission and differential.
2

CV Joint/Axle Nut

M16 x 1.5
Torque Specification
180 ft-lbs (245 N·m)
Important Notes
Securely attach CV joint to axle.

Differential

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Securely attach differential drain/fill plug.

Transfer Case

1

Transfer Case Mounting Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Securely attach transfer case to transmission and chassis.

Electrical

Torque specifications for Electrical

Electrical Accessories

1

Alternator Mounting Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2

Starter Motor Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)

Electrical Connections

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
2

Fuel Pump Electrical Connector Bolts

M6 x 1
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value based on general industry guidelines. Consult component manufacturer for specific torque recommendations.
3

A/C Compressor Electrical Connector Bolts

M6 x 1
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value based on general industry guidelines. Consult component manufacturer for specific torque recommendations.

Ignition System

1

Ignition Coil Mounting Bolts

M10 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 12 ft-lbs (16 N·m)
Important Notes
Estimated range based on general industry guidelines. Consult component manufacturer for specific torque recommendations.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure connection to the cylinder head.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure connection to the cylinder head.
3

Catalytic Converter to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure connection to the exhaust pipe.

Emissions Sensors

1

Oxygen Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value. Secure connection to the exhaust system.
2

Lambda Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value. Secure connection to the exhaust system.
3

NOx Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value. Secure connection to the exhaust system.

EGR System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure connection to the intake manifold.

Diesel Particulate Filter (DPF)

1

DPF Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value. Secure connection to the exhaust system.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 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
18 ft-lbs (25 N·m)
Important Notes
Ensure a secure connection to prevent leaks and heat damage.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a secure connection to prevent leaks and maintain emissions control.

Muffler

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a secure connection to prevent leaks and reduce noise.

Heat Shield

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. Ensure not to over-tighten to avoid damage.

Exhaust Hanger

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a secure connection to prevent excessive movement and noise.

Oxygen Sensor

1

Oxygen Sensor Mounting Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure a secure connection to prevent leaks and ensure accurate sensor readings.

Exhaust Flange

1

Exhaust Flange Bolts (Downpipe to Midpipe)

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a secure connection to prevent leaks and maintain proper exhaust flow.

Fuel

Torque specifications for Fuel

Intake System

1

Throttle Body Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the throttle body to the intake manifold.
2

Intake Manifold Bolts

M10 x 1.5
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Secure the intake manifold to the engine block.

Fuel System

1

Fuel Rail Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the fuel rail to the engine.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the fuel injectors to the engine.
3

Fuel Pump Mounting Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure the fuel pump to the engine or fuel tank.

Fuel Tank and Filler System

1

Fuel Tank Strap Bolts

M14 x 2.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Secure the fuel tank to the vehicle.
2

Fuel Filler Neck Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the fuel filler neck to the fuel tank.

Fuel Filter and Pressure Regulator

1

Fuel Filter Bolt/Nut

M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Secure the fuel filter to the engine or fuel system.
2

Fuel Pressure Regulator Mounting Bolts

M10 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 12 ft-lbs (16 N·m)
Important Notes
Secure the fuel pressure regulator to the fuel rail or engine. Estimated torque values.

Hvac

Torque specifications for Hvac

A/C Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Proper torque is essential to prevent damage to the compressor or surrounding components.
2

A/C Compressor Clutch Bolt

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Proper torque is essential to prevent damage to the compressor or clutch.

A/C Condenser

1

A/C Condenser Mounting Bolts

M12 x 1.75
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent damage to the condenser or surrounding components. Estimated value based on general industry standards.

A/C Evaporator

1

A/C Evaporator Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque is essential to prevent damage to the evaporator or surrounding components. Estimated value based on general industry standards.

A/C Refrigerant Lines

1

A/C Line Fittings

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque ensures a leak-tight seal and prevents refrigerant leaks.
2

A/C Refrigerant Line Bracket Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque ensures a secure connection and prevents refrigerant leaks. Estimated value based on general industry standards.

Suspension

Torque specifications for Suspension

Strut And Shock Absorber

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Incorrect torque can lead to uneven tire wear, reduced handling, and compromised safety.

Control Arm

1

Control Arm Bolts

M12 x 1.25
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Insufficient torque can cause loose connections, leading to uneven tire wear and reduced handling.
2

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Insufficient torque can cause loose connections, leading to uneven tire wear and reduced handling.
3

Lower Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Insufficient torque can cause loose connections, leading to uneven tire wear and reduced handling.

Steering

1

Ball Joint Nut

M16 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Incorrect torque can lead to loose connections, causing uneven tire wear, reduced handling, and potentially catastrophic failure.
2

Tie Rod End Nut

M14 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Insufficient torque can cause loose connections, leading to uneven tire wear, reduced handling, and compromised safety.
3

Steering Knuckle Bolts

M16 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated value. Incorrect torque can lead to loose connections, causing uneven tire wear, reduced handling, and compromised safety.
4

Hub/Wheel Bearing Bolts

M14 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated value. Insufficient torque can cause loose connections, leading to uneven tire wear, reduced handling, and compromised safety.

Sway Bar

1

Sway Bar Link Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Incorrect torque can lead to loose connections, causing uneven tire wear, reduced handling, and compromised safety.

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 value for the cylinder head bolts on a 2007-2014 Mercedes C-Class?

The torque specification for the cylinder head bolts on a 2007-2014 Mercedes C-Class IS 90 Nm (66 lb-ft) plus an additional 90-degree turn.

Q2

What type of torque wrench should I use to tighten bolts on my Mercedes C-Class?

It IS recommended to use a calibrated torque wrench that meets or exceeds DIN EN ISO 6789 standards when tightening bolts on a Mercedes C-Class.

Q3

Can I use a standard torque wrench to tighten bolts on my Mercedes C-Class's engine?

No. It IS not recommended to use a standard torque wrench to tighten bolts on the engine of a Mercedes C-Class. The engine bolts require a precise torque value and a standard torque wrench may not provide sufficient accuracy.

Q4

What IS the recommended torque value for the spark plugs on a Mercedes C-Class?

The recommended torque value for the spark plugs on a 2007-2014 Mercedes C-Class IS 28 Nm (21 lb-ft).

Q5

Can I use an impact wrench to tighten bolts on my Mercedes C-Class?

No. Impact wrenches are not recommended for use on Mercedes C-Class vehicles as they can cause damage to the bolts and surrounding 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

Ratchet and Socket Set (Metric)

Essential for accessing and tightening bolts, ensuring proper engagement and torque application.

  • Socket sizes to fit all bolt heads
  • Ratchet for efficient and controlled tightening
  • Extension bars for reaching bolts in confined spaces
Learn more

Torque Wrench (10-100 Nm)

Required for precise torque application, preventing under or over-tightening.

  • Calibrated for accurate torque readings
  • Adjustable torque range to cover all specifications
  • Click or audible signal when target torque IS reached
Learn more
Service Procedures

Bolt Torque Specifications for 2007-2014 Mercedes-Benz C-Class

Comprehensive guide to torque specifications for various components.

  • Overview of torque values for engine, suspension, brakes, and other components
  • Safety tips and precautions for working on vehicles
  • Specific instructions and diagrams for tightening bolts
View full procedure
Technical Service Bulletins

TSB 20-01-04: Improper Bolt Torque on Cylinder Head

2020-01-04

Concerns loose cylinder head bolts due to incorrect torque values.

2007-2014 C-Class (M272 engine)

Resolution: Inspect and re-torque cylinder head bolts to specified values

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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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