Mercedes-Benz Vehicle Models Mercedes CLK 1997-2002 Torque Specifications
Mercedes-Benz Vehicle Models Mercedes CLK 1997-2002

Mercedes-Benz Vehicle Models Mercedes CLK 1997-2002 Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes CLK 1997-2002 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

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2.0l I4 Engine

Torque specifications for 2.0L-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 specified torque sequence for the cylinder head bolts.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.4 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
45 ft-lbs (61 N·m)
Important Notes
Follow the manufacturer's specified torque sequence for main bearing bolts.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
Ensure proper alignment of connecting rod caps before tightening.

Timing System

1

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
66 ft-lbs (90 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension on the timing belt/chain before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Follow the manufacturer's specified torque sequence for intake manifold bolts.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Follow the manufacturer's specified torque sequence for exhaust manifold bolts.

Oil System

1

Oil Pan Bolts

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

Oil Drain Plug

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Replace the crush washer with a new one during installation.

2.3l I4 Engine

Torque specifications for 2.3L-I4 Engine

Cylinder Head and Valve Train

1

Cylinder Head Bolts

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

Valve Cover Bolts

M8 x 1.25
Torque Specification
89 inch-lbs (10 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Specification
19 ft-lbs (26 N·m)

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 2.0
Torque Specification
45 ft-lbs (61 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
81 ft-lbs (110 N·m)

Cylinder Head and Engine Accessories

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
16 ft-lbs (22 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
3

Spark Plugs

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

Engine Mounts and Accessories

1

Engine Mounting Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value, actual value may vary depending on engine and component design.
2

Oil Pan Bolts

M10 x 1.5
Torque Specification
89 inch-lbs (10 N·m)
3

Water Pump Bolts

M10 x 1.5
Torque Specification
89 inch-lbs (10 N·m)

Fuel System and Accessories

1

Fuel Injector Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
2

Fuel Pressure Regulator Bolt

M10 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value, actual value may vary depending on engine and component design.

PCV System and Accessories

1

PCV Valve Bolt

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value, actual value may vary depending on engine and component design.

Throttle Body and Accessories

1

Throttle Body Idle Air Control Valve Bolt

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value, actual value may vary depending on engine and component design.

Oil System and Accessories

1

Oil Filter Housing Bolt

M10 x 1.5
Torque Specification
N/A
Important Notes
Hand tight only.
2

Oil Drain Plug Bolt

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

3.2l Engine

Torque specifications for 3.2L 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 to avoid warping the cylinder head.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 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
45 ft-lbs (61 N·m)
Important Notes
Ensure the bearing caps are properly aligned before tightening.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated 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
66 ft-lbs (90 N·m)
Important Notes
Ensure the camshaft sprocket is properly aligned before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Ensure the intake manifold gasket is properly seated before tightening.
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.

Oil System

1

Oil Pan Bolts

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

Oil Drain Plug

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the oil drain plug washer is in good condition before tightening.

3.2l V6 Engine

Torque specifications for 3.2L-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 to avoid warping the cylinder head.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 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
45 ft-lbs (61 N·m)
Important Notes
Ensure the bearing caps are properly aligned before tightening.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated 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
66 ft-lbs (90 N·m)
Important Notes
Ensure the camshaft sprocket is properly aligned before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Ensure the intake manifold gasket is properly seated before tightening.
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.

Oil System

1

Oil Pan Bolts

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

Oil Drain Plug

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the oil drain plug washer is in good condition before tightening.

Body

Torque specifications for Body

Suspension

1

Strut/Shock Absorber Mounting Bolts

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

Control Arm Bolts

M14 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
3

Ball Joint Nut

M16 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
4

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (48 N·m)
5

Sway Bar Link Nut

M12 x 1.25
Torque Specification
37 ft-lbs (50 N·m)

Steering

1

Steering Gear/Rack Bolts

M16 x 1.5
Torque Specification
79 ft-lbs (107 N·m)

Body and Frame

1

Body Mount Bolts

M14 x 1.5
Torque Specification
1. 40 ft-lbs (54 N·m) 2. 50 ft-lbs (68 N·m)
Important Notes
Estimated torque value range. Consult manufacturer specifications for accurate information.
2

Door Hinge Bolts

M10 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque value range. Consult manufacturer specifications for accurate information.
3

Hood Hinge Bolts

M10 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque value range. Consult manufacturer specifications for accurate information.
4

Trunk Lid Hinge Bolts

M10 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque value range. Consult manufacturer specifications for accurate information.
5

Bumper Mounting Bolts

M12 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 30 ft-lbs (40 N·m)
Important Notes
Estimated torque value range. Consult manufacturer specifications for accurate information.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
79 ft-lbs (107 N·m)
Important Notes
Ensure proper alignment of the caliper during installation.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
89 ft-lbs (120 N·m)
Important Notes
Ensure the bracket is properly aligned with the steering knuckle or axle.

Brake Disc Drum

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Refer to the manufacturer's specifications for exact torque.

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
19 ft-lbs (26 N·m)
Important Notes
Estimated value. Ensure the sealing washers are properly installed.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure the master cylinder is properly aligned with the brake booster.

Brake Booster

1

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure the booster is properly aligned with the firewall.

Brake Pedal

1

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure the pedal operates smoothly after installation.

Abs System

1

ABS Sensor Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value. Ensure the sensor is properly aligned with the wheel hub.

Wheel Assembly

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
80 ft-lbs (110 N·m)
Important Notes
Always use a calibrated torque wrench and follow the manufacturer's recommended sequence.

Drivetrain

Torque specifications for Drivetrain

Engine

1

Flywheel Bolts

M12 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Securely attaches flywheel to crankshaft.
2

Main Bearing Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Secures main bearings to crankshaft.
3

Connecting Rod Nuts

M10 x 1.5
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
Secures connecting rods to crankshaft.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Important Notes
Secures crankshaft pulley/harmonic balancer to crankshaft.

Transmission

1

Transmission Mounting Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures transmission to engine and chassis.
2

Transmission Oil Pan Bolts

M10 x 1.5
Torque Specification
89 in-lbs (10 N·m)
Important Notes
Secures oil pan to transmission.
3

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Allows for transmission fluid to be drained and filled.

Drivetrain

1

Drive Axle/Half Shaft Bolts

M16 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Secures axles to transmission and differential.
2

CV Joint/Axle Nut

M20 x 1.5
Torque Specification
236 ft-lbs (320 N·m)
Important Notes
Secures CV joint to axle.
3

Propeller/Drive Shaft Bolts

M18 x 1.5
Torque Specification
Varies ft-lbs (Varies N·m)
Important Notes
Secures drive shaft to transmission and differential. Refer to manufacturer's specifications for torque value.

Differential

1

Differential Cover Bolts

M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures differential cover to differential.
2

Axle Shaft Retaining Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secures axle shafts to differential and transmission.

Transfer Case

1

Transfer Case Mounting Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures transfer case to transmission and chassis.

Electrical

Torque specifications for Electrical

Electrical System

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Proper torque prevents loose connections, which can cause electrical malfunctions and safety issues.
2

Starter Motor Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the starter motor operates reliably and efficiently.
3

Alternator Mounting Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Proper torque ensures the alternator operates reliably and efficiently.
4

Ground Strap Bolts

M6 x 1.0
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Proper torque ensures reliable electrical operation and prevents damage to components.
5

Ignition Coil Mounting Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Proper torque ensures the ignition coil operates reliably and efficiently.
6

Fuse Box Mounting Bolts

M6 x 1.0
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Proper torque ensures the fuse box remains secure and operates reliably.

Emissions Sensors

Torque specifications for Emissions_sensors

Emissions Sensors

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the EGR valve to ensure proper exhaust gas recirculation.
2

Fuel Injector Bolts

M10 x 1.5
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the fuel injectors to ensure proper fuel spray and engine performance.
3

Fuel Rail Bolts

M12 x 1.75
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the fuel rail to ensure proper fuel supply to the injectors.
4

Oxygen Sensor Bolts

M18 x 1.5
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value. Secure the oxygen sensor to ensure accurate readings and proper engine performance.
5

Mass Airflow Sensor (MAF) Bolts

M10 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Secure the MAF sensor to ensure accurate airflow measurements.
6

Throttle Position Sensor (TPS) Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Secure the TPS to ensure accurate throttle position measurements.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

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.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure gaskets are properly seated before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening.
3

Muffler to Exhaust Pipe Bolts

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

Exhaust Support Components

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure hangers are properly aligned to prevent stress on the exhaust system.
2

Oxygen Sensor Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the sensor is properly seated to prevent exhaust leaks.
3

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Avoid over-tightening to prevent damage to the heat shield or mounting points.

Exhaust Flange Connections

1

Exhaust Flange Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure flanges are properly aligned and gaskets are in place before tightening.

Fuel

Torque specifications for Fuel

Fuel Rail System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure injectors are properly seated before tightening.
3

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system.

Fuel Delivery System

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the fuel pump is properly aligned with the fuel tank or mounting bracket.
2

Fuel Line Fittings

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure fittings are properly seated before tightening.
3

Fuel Filter Bolt/Nut

M6 x 1.0
Torque Specification
N/A
Important Notes
Hand-tighten only. Over-tightening may damage the filter housing.

Fuel Tank System

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
27 ft-lbs (37 N·m)
Important Notes
Ensure the fuel tank is properly aligned before tightening the straps.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the filler neck is properly aligned with the fuel tank.
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system.

Fuel Evaporative System

1

Fuel Evaporative System (EVAP) Canister Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute load.

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a torque wrench to avoid overtightening, which can damage fittings.

Cooling System

1

Thermostat Housing Bolts

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

Water Pump Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even pressure on the gasket.

Heater Core

1

Heater Core Inlet/Outlet Pipe Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar coolant line fittings.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar small mounting bolts.

Evaporator Core

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar housing bolts.

Hvac Controls

1

HVAC Control Panel Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar small mounting bolts.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Proper torque ensures the strut/shock absorber is securely attached, maintaining vehicle stability and handling.
2

Control Arm Bolts

M14 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Proper torque ensures the control arm is securely attached, maintaining vehicle stability and handling.
3

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Proper torque ensures the bushings are securely attached, maintaining vehicle stability and handling.
4

Lower Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Proper torque ensures the bushings are securely attached, maintaining vehicle stability and handling.
5

Steering Knuckle Bolts

M16 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated value. Proper torque ensures the steering knuckle is securely attached, maintaining vehicle stability and handling.

Steering System

1

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
79 ft-lbs (107 N·m)
Important Notes
Proper torque ensures the steering gear/rack is securely attached, maintaining vehicle stability and handling.
2

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (48 N·m)
Important Notes
Proper torque ensures the tie rod end is securely attached, maintaining vehicle stability and handling.

Stabilizer Bar

1

Stabilizer Bar Mounting Bolts

M12 x 1.25
Torque Specification
35 ft-lbs (48 N·m)
Important Notes
Estimated value. Proper torque ensures the stabilizer bar is securely attached, maintaining vehicle stability and 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 recommended torque for the lug nuts on a 1997-2002 Mercedes clk?

100 ft-lb (136 Nm)

Q2

What IS the torque spec for the oil filter housing drain plug on a 1997-2002 Mercedes clk?

25 ft-lb (34 Nm)

Q3

What type of torque wrench should be used to ensure accurate measurements?

A click-type torque wrench with a range of 0-150 ft-lb (0-203 Nm)

Q4

How often should torque specifications be checked and reapplied?

At every oil change and tire rotation, or as per the vehicle's maintenance schedule

Q5

What are the consequences of over-tightening or under-tightening bolts?

Over-tightening can damage bolts, while under-tightening can lead to loose connections and potential failures

Q6

Are there any special tools required for measuring torque on a 1997-2002 Mercedes clk?

No, a standard click-type torque wrench IS sufficient

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 clk.

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

Torque Stick or Bar

Provides increased leverage and precision when applying torque, especially in tight or awkward spaces.

  • Various lengths and drive sizes for different applications
  • Marked with torque values for easy reference
  • Durable construction for long-lasting use
Learn more

Click-Type Torque Wrench

Audible and tactile feedback helps ensure proper tightening torque, ideal for situations where a digital display IS not required.

  • Adjustable torque range with audible and tactile click
  • Compact size for easy storage and use
  • Ergonomic handle for comfort
Learn more
Service Procedures

Engine Head Bolt Torque Procedure

Step-by-step instructions for tightening engine head bolts in the correct sequence and torque specifications.

  • Clean bolt threads and mating surfaces
  • Apply engine oil to bolt threads
  • Tighten bolts in a star pattern, progressively increasing torque
  • Final torque specification: 60 Nm
  • Retorque bolts after heat cycling and coolant flush
View full procedure

Suspension Component Torque Specifications

Torque specifications for various suspension components, including bolts, nuts, and control arms.

  • Tighten upper control arm bolts to 70 Nm
  • Tighten lower control arm bolts to 90 Nm
  • Tighten ball joint nuts to 40 Nm
  • Tighten sway bar link nuts to 50 Nm
View full procedure
Technical Service Bulletins

Updated Engine Head Bolt Torque Specifications

2001-05-15

Technical bulletin released by Mercedes-Benz revising torque specifications for 2001-2002 clk models due to manufacturing updates.

2001-2002 clk

Resolution: Revised head bolt torque specification: 60 Nm

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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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