Mercedes-Benz Mercedes S-Class 2005-2013 5.5L V8 Engine Bolt Torque Specifications & Fastener Values
Mercedes-Benz Mercedes S-Class 2005-2013

Mercedes-Benz Mercedes S-Class 2005-2013 5.5L V8 Engine Bolt Torque Specifications

Detailed torque specifications for the 5.5L V8 engine bolts in the 2005-2013 Mercedes S-Class, including cylinder head, main bearing, and connecting rod bolts.

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

Cylinder Head

The cylinder head system includes components that seal the combustion chamber, manage airflow, and support valve operation. Proper torque is critical to prevent leaks and ensure engine performance.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Multi-step torque sequence is required to ensure proper clamping force on the cylinder head gasket.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure even tightening to prevent oil leaks.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper valve operation by tightening evenly.

Crankshaft And Bearings

The crankshaft and bearings system supports the rotating assembly and ensures proper alignment and lubrication. Proper torque is critical to prevent engine damage.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
54 ft-lbs (74 N·m)
Important Notes
Follow the specified torque sequence to ensure proper crankshaft alignment.
2

Connecting Rod Nuts

M8 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Ensure proper torque to prevent rod failure.
3

Flywheel Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure proper torque to maintain engine balance.

Timing System

The timing system ensures proper synchronization of the crankshaft and camshaft. Proper torque is critical to maintain accurate engine timing.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper tensioner operation by tightening evenly.
2

Camshaft Sprocket Bolt

M12 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

The intake and exhaust system manages airflow into and out of the engine. Proper torque ensures optimal performance and prevents leaks.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Follow the specified torque sequence to prevent vacuum leaks.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper sealing of exhaust gases.

Oil System

The oil system ensures proper lubrication of engine components. Proper torque prevents leaks and ensures optimal oil pressure.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
6.7 ft-lbs (9 N·m)
Important Notes
Ensure even tightening to prevent oil leaks.
2

Oil Drain Plug Bolt

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper sealing to prevent oil leaks.

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 are the torque specifications for the cylinder head bolts on the 5.5L V8 engine?

The cylinder head bolts on the 2005-2013 Mercedes S-Class 5.5L V8 engine should be torqued in three stages: Stage 1 - 30 Nm (22 lb-ft), Stage 2 - 90 degrees, and Stage 3 - an additional 90 degrees. Always follow the manufacturer's sequence and use a calibrated torque wrench.

Q2

How often should I check the torque on engine components?

Torque checks should be performed during major service intervals (e.g., every 60,000 miles) or after any engine repair. For critical components like cylinder head bolts, re-torquing is not typically required unless specified in the repair manual.

Q3

Can I reuse the cylinder head bolts on the 5.5L V8 engine?

No, the cylinder head bolts on the 5.5L V8 engine are torque-to-yield (TTY) bolts and should not be reused. They are designed to stretch during installation and must be replaced with new bolts to ensure proper clamping force and prevent leaks or engine damage.

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

A precision tool for applying accurate torque to engine bolts.

  • Adjustable torque settings
  • Digital display for precise readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation when applying torque-to-yield bolts.

  • Magnetic base for easy attachment
  • Clear angle markings for accuracy
Learn more

Engine Bolt Torque Sequence Chart

A reference chart for the correct bolt tightening sequence.

  • Specific to the 5.5L V8 engine
  • Includes torque values for all critical bolts
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 5.5L V8 engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the bolt threads.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Use a torque angle gauge to apply the final torque-to-yield specification.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Steps for torquing main bearing cap bolts to ensure proper engine assembly.

  • Ensure the bearing caps and engine block are clean and free of debris.
  • Lubricate the bolt threads with engine oil.
  • Tighten bolts in the specified sequence to the initial torque value.
  • Apply the final torque-to-yield specification using a torque angle gauge.
View full procedure

Connecting Rod Bolt Torque Procedure

Procedure for torquing connecting rod bolts on the 5.5L V8 engine.

  • Clean the connecting rod bolts and threads.
  • Apply engine oil to the bolt threads.
  • Tighten bolts to the specified torque value in the correct sequence.
  • Use a torque angle gauge for the final torque-to-yield step.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Failure in 5.5L V8 Engines

2010-05-15

Reports of cylinder head bolt failures in certain 2005-2013 Mercedes S-Class models with the 5.5L V8 engine.

2005-2013 Mercedes S-Class

Resolution: Replace cylinder head bolts with updated parts and follow the revised torque procedure.

Main Bearing Cap Bolt Loosening Issue

2012-08-22

Some 5.5L V8 engines may experience main bearing cap bolt loosening, leading to engine noise and potential damage.

2008-2012 Mercedes S-Class

Resolution: Inspect and retorque main bearing cap bolts using the updated torque specifications.

Connecting Rod Bolt Torque Specification Update

2011-03-10

Revised torque specifications for connecting rod bolts in the 5.5L V8 engine to prevent premature failure.

2005-2011 Mercedes S-Class

Resolution: Follow the updated torque procedure and replace connecting rod bolts if necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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