Mercedes-Benz Vehicle Models Mercedes SLS 2010-2014 Torque Specifications
Mercedes-Benz Vehicle Models Mercedes SLS 2010-2014

Mercedes-Benz Vehicle Models Mercedes SLS 2010-2014 Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes SLS 2010-2014 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

6.2l Engine

Torque specifications for 6.2L Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
1. 25 ft-lbs (34 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Camshaft Sprocket Bolt

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.
2

Timing Chain Tensioner Bolt

M6 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly seated before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Exhaust Manifold Bolts

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

Accessories

1

Alternator Mounting Bolts

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

Serpentine Belt Tensioner Bolt

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

6.2l V8 Engine

Torque specifications for 6.2L-V8 Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
1. 25 ft-lbs (34 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Camshaft Sprocket Bolt

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.
2

Timing Chain Tensioner Bolt

M6 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly seated before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Exhaust Manifold Bolts

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

Accessories

1

Alternator Mounting Bolts

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

Serpentine Belt Tensioner Bolt

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

7g Tronic Transmission

Torque specifications for 7g Tronic Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Proper torque ensures the transmission is securely attached to the engine block and chassis.

Transmission Oil System

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures the oil pan is securely attached to the transmission case.
2

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures a leak-free seal for the transmission fluid system.
3

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures a leak-free seal for the transmission fluid system.

Transmission Bellhousing and Crossmember

1

Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures the transmission bellhousing is securely attached to the engine block.
2

Transmission Crossmember Bolts

M12 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures the transmission crossmember is securely attached to the chassis.

Transmission Cooler Lines

1

Transmission Cooler Line Fittings

M10 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures a leak-free seal for the transmission cooler lines.

Transmission Solenoid Pack

1

Transmission Solenoid Pack Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards. Proper torque ensures the solenoid pack is securely attached to the transmission case.

Body

Torque specifications for Body

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

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

Control Arm Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
3

Ball Joint Nut

M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
4

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
5

Sway Bar Link Nut

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
6

Steering Gear/Rack Bolts

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

Body Mounting and Hinges

1

Body Mounting Bolts

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value. Consult service manual for accurate torque value.
2

Door Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Consult service manual for accurate torque value.
3

Trunk Lid Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Consult service manual for accurate torque value.
4

Hood Hinge Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Consult service manual for accurate torque value.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the caliper is properly aligned before torquing.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
125 ft-lbs (169 N·m)
Important Notes
Critical for maintaining structural integrity of the braking system.

Brake Rotor Drum

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure the rotor/drum is seated properly on the hub before torquing.

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the sealing washers are in good condition and properly seated.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the master cylinder is properly aligned with the brake booster.

Brake Booster

1

Brake Booster Mounting Bolts

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

Brake Pedal

1

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the pedal assembly is properly aligned with the master cylinder pushrod.

Wheel Assembly

1

Wheel Lug Nuts

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

Drivetrain

Torque specifications for Drivetrain

Engine and Transmission Mounting

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.
2

Transmission Crossmember Bolts

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.

Flywheel and Crankshaft

1

Flywheel Bolts

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

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)

Transmission and Driveshaft

1

Transmission Mounting Bolts

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
2

Propeller/Drive Shaft Bolts

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

Differential and Axles

1

Differential Cover Bolts

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's recommendations.
2

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
3

CV Joint/Axle Nut

M18 x 1.5
Torque Specification
180 ft-lbs (244 N·m)

Transfer Case and Differential Fluid

1

Transfer Case Drain/Fill Plug

M12 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
2

Differential Drain/Fill Plug

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

Electrical

Torque specifications for Electrical

Starter Motor Mounting

1

Starter Motor Mounting Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Improper torque can lead to poor engine starting, misfires, or starter motor failure.

Alternator Mounting

1

Alternator Mounting Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Improper torque can lead to alternator vibration, over/under-tightening, or premature wear.

Battery Terminal Mounting

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Over-tightening can damage the terminals, while under-tightening can cause poor electrical connections.

Engine Grounding

1

Engine Ground Bolts

M8 x 1.25 (estimated)
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Recommended torque value may vary depending on the specific vehicle and component manufacturer.

Electrical Connectors

1

Electrical Connector Bolts

M4 x 0.7 (estimated)
Torque Specification
8.5 ft-lbs (12 N·m)
Important Notes
Estimated value. Recommended torque value may vary depending on the specific vehicle and component manufacturer.

Spark Plug Wire Retainers

1

Spark Plug Wire Retainer Bolts

M3 x 0.5 (estimated)
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Recommended torque value may vary depending on the specific vehicle and component manufacturer.

Engine Electronics Mounting

1

Engine Electronics Mounting Bolts

M6 x 1 (estimated)
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Recommended torque value may vary depending on the specific vehicle and component manufacturer.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque ensures a leak-free connection and correct sensor function.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque ensures a secure and leak-free connection.
3

Catalytic Converter to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque prevents leaks and ensures accurate oxygen sensor readings.
4

Muffler to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque ensures a secure connection and prevents leaks.

Oxygen Sensors

1

Oxygen Sensor Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Proper torque avoids damage to the sensor or its electrical connections.

NOx Sensors

1

NOx Sensor Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Proper torque avoids damage to the sensor or its electrical connections.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Headers to Cylinder Head 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 Pipe to Exhaust Manifold/Headers Bolts

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

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

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

Muffler

1

Muffler to Exhaust Pipe Bolts

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

Exhaust Hangers

1

Exhaust Hanger Bolts

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

Oxygen Sensors

1

Oxygen Sensor Bolts

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the sensor is properly seated before tightening.

Heat Shields

1

Exhaust Heat Shield Bolts

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

Exhaust Flanges

1

Exhaust Flange Bolts (Downpipe to Midpipe)

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

Fuel

Torque specifications for Fuel

Fuel Rail and Injector System

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.
2

Fuel Injector Bolts

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

Fuel Injector Rail Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Proper torque is necessary to maintain fuel system integrity and prevent leaks.

Fuel Pump and Filter System

1

Fuel Pump Mounting Bolts

M12 x 1.75
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Incorrect torque can lead to fuel pump failure, decreased fuel pressure, and engine performance issues.
2

Fuel Filter Bolt/Nut

M14 x 2.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Proper torque is necessary to maintain a tight seal and prevent fuel leaks.

Fuel Tank and Filler System

1

Fuel Filler Neck Bolts

M10 x 1.5
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque is essential to maintain a tight seal and prevent fuel spills.
2

Fuel Tank Strap Bolts

M14 x 2.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Incorrect torque can lead to fuel tank damage, fuel leaks, and potential safety hazards.

Estimated Torque Specifications

1

Fuel Pressure Regulator Mounting Bolts

M10 x 1.5 (estimated)
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated torque value. Consult manufacturer's documentation or a reliable repair manual for accurate torque specifications.
2

Fuel Line Fittings

M12 x 1.75 (estimated)
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque value. Consult manufacturer's documentation or a reliable repair manual for accurate torque specifications.
3

Fuel Injector O-Ring or Gasket Bolts

M8 x 1.25 (estimated)
Torque Specification
1. 5 ft-lbs (7 N·m) 2. 10 ft-lbs (14 N·m)
Important Notes
Estimated torque value. Consult manufacturer's documentation or a reliable repair manual for accurate torque specifications.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Over-tightening can damage O-rings or fittings, while under-tightening can cause leaks.

Evaporator

1

Evaporator Housing Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Over-tightening can crack the housing, while under-tightening can cause air leaks.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Incorrect torque can lead to motor failure or air leaks.

Heater Core

1

Heater Core Inlet/Outlet Fittings

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Over-tightening can damage the fittings, while under-tightening can cause coolant leaks.

Control Valve

1

HVAC Control Valve Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Incorrect torque can lead to leaks or valve malfunction.

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Incorrect torque can cause leaks or damage to the condenser.

Suspension

Torque specifications for Suspension

Strut/Shock Absorber Mounting

1

Strut/Shock Absorber Mounting Bolts

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

Control Arm Mounting

1

Control Arm Bolts

M12 x 1.25
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

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

Steering System

1

Tie Rod End Nut

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
2

Steering Gear Mounting Bolts

M12 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated value based on industry standards for similar applications.

Sway Bar System

1

Sway Bar Link Nut

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)

Coil Spring Mounting

1

Coil Spring Mounting Bolts

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

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 torque spec for the lug nuts on a 2010-2014 Mercedes sls?

120 Nm (89 ft-lb) plus an additional 90 degrees

Q2

What type of torque wrench should I use for tightening suspension bolts on my 2012 Mercedes sls?

Use a calibrated click-type torque wrench with a range of 10-200 Nm (7-150 ft-lb)

Q3

How do I properly torque the spark plugs on a 2010 Mercedes sls?

Tighten the spark plugs to 25 Nm (18 ft-lb) using a 16 mm (5/8 in) spark plug socket

Q4

What are the torque specifications for the cylinder head bolts on a 2014 Mercedes sls?

Follow these steps for tightening the cylinder head bolts: 1. Tighten the cylinder head bolts to 40 Nm (30 ft-lb) in the correct sequence. 2. Loosen the cylinder head bolts 180 degrees. 3. Tighten the cylinder head bolts to 60 Nm (44 ft-lb) in the correct sequence. 4. Tighten the cylinder head bolts an additional 90 degrees.

Q5

How do I torque the crankshaft pulley bolt on my 2013 Mercedes sls?

Tighten the crankshaft pulley bolt to 150 Nm (111 ft-lb) using a 32 mm (1.25 in) socket

Q6

What IS the torque spec for the oil drain plug on a 2011 Mercedes sls?

Tighten the oil drain plug to 25 Nm (18 ft-lb) using a 17 mm (11/16 in) socket

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 tool for precisely tightening fasteners within specified torque ranges.

  • Precise torque readings displayed digitally
  • Audible signals indicating when target torque IS reached
  • Multiple torque units (Nm, ft-lb, in-lb)
  • Reversible ratcheting action
Learn more
Service Procedures

Cylinder Head Bolt Tightening Sequence

Step-by-step guide for tightening cylinder head bolts in the correct order and torque specifications.

  • Follow the tightening sequence as per the service manual.
  • Apply engine oil to the threads of the bolts for lubrication.
  • Tighten the bolts to the specified torque in multiple stages, gradually increasing the torque.
View full procedure
Technical Service Bulletins

TSB: Revised Torque Specifications for Suspension Components

2012-05-25

Update on torque specifications for suspension components, including control arms, ball joints, and tie rods.

2010-2012 sls

Resolution: Refer to the updated torque specifications provided in the technical bulletin for proper installation of suspension components.

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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.
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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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