BMW M6 2005-2010 5.0L Engine Bolt Torque Specifications & Fastener Values
BMW M6 2005-2010

BMW M6 2005-2010 5.0L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts and fasteners on the 5.0L V10 engine in the 2005-2010 BMW M6 (E63/E64). Includes cylinder head bolts, connecting rod bolts, main bearing bolts, and other critical engine component fasteners.

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

Specifications for bolts securing the cylinder head to the engine block. Proper torque and sequence are critical for maintaining compression and preventing leaks.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Cylinder head bolts are torque-to-yield (TTY) and must be replaced each time they are removed. Follow the specific torque sequence specified in the official BMW service manual. Estimated values provided

Crankshaft

Specifications for bolts related to the crankshaft, including main bearing caps, connecting rods, and flywheel.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Main bearing bolts are torque-to-yield (TTY) and must be replaced each time they are removed. Follow the specific torque sequence specified in the official BMW service manual. Estimated values provided.
2

Connecting Rod Nuts

M9 x 1.0
Important Notes
Connecting rod nuts are often torque-to-yield (TTY) and should be replaced each time they are removed. Follow the specific torque sequence specified in the official BMW service manual. Estimated values provided.
3

Flywheel Bolts

M12 x 1.5
Torque Value
88 ft-lbs (120 N·m)
Important Notes
Flywheel bolts are single-use and must be replaced each time they are removed. Tighten bolts in a star pattern.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
166 ft-lbs (225 N·m)
Important Notes
Crankshaft pulley/harmonic balancer bolts are single-use and must be replaced each time they are removed.

Oil System

Specifications for bolts related to the oil pan, oil filter housing, and oil drain plug.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten oil pan bolts in a crisscross pattern to ensure even sealing. Ensure a proper gasket or sealant is used.
2

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure the oil filter housing gasket is in good condition or replace it. Tighten evenly
3

Oil Drain Plug Bolt

M12 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Always use a new sealing ring on the oil drain plug.

Valve Train

Specifications for bolts related to the valve covers, rocker arms, camshafts, and VANOS system.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten valve cover bolts in a crisscross pattern to ensure even sealing. Ensure a proper gasket is used.
2

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
89 ft-lbs (120 N·m)
Important Notes
Camshaft sprocket bolts are usually single-use and must be replaced each time they are removed.
3

Rocker Arms/Shafts Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten rocker arm bolts evenly.
4

VANOS Solenoid Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the sealing surfaces are clean and use a new seal if necessary. Estimated value.
5

VANOS Unit Mounting Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten the VANOS unit mounting bolts evenly. Estimated value.
6

VANOS Oil Line Bolts

M10 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure to use new sealing rings or crush washers. Estimated value

Timing System

Specifications for bolts related to the timing chain/belt tensioner.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tensioner alignment and operation after installation.

Intake System

Specifications for bolts related to the intake manifold, throttle body, and fuel rail.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten intake manifold bolts in a crisscross pattern to ensure even sealing.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the throttle body gasket is in good condition and in place.
3

Fuel Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper seating of the fuel rail and injectors.
4

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the injector o-rings are in good condition and lubricated with fuel injector safe lubricant.
5

EGR Valve Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
This torque specification is only applicable if the engine is equipped with an EGR system. Ensure proper sealing of the EGR valve to prevent leaks.

Exhaust System

Specifications for bolts related to the exhaust manifolds and flanges.

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Exhaust manifold bolts should always be replaced with new ones. Use a new exhaust manifold gasket, and tighten in a crisscross pattern.
2

Exhaust Flange Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Tighten exhaust flange bolts evenly to prevent leaks. Ensure to use new gaskets if necessary.

Cooling System

Specifications for bolts related to the water pump and thermostat housing.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing and use a new gasket if necessary. Tighten bolts evenly.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten water pump pulley bolts evenly.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing and use a new gasket if necessary. Tighten evenly

Electrical System

Specifications for bolts related to the ignition coils, camshaft position sensors, knock sensors, and various other sensors.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten ignition coil bolts evenly.
2

Camshaft Position Sensor Bolt(s)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten camshaft position sensor bolts evenly. Estimated value
3

Knock Sensor Bolt(s)

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten knock sensor bolts evenly. Estimated value
4

Oil Pressure Sensor Bolt/Nut(s)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten oil pressure sensor bolts evenly. Estimated value
5

Coolant Temperature Sensor Bolt/Nut(s)

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Hand tight or low torque is critical to preventing damage to the components. Estimated Value.
6

Intake Air Temperature Sensor Bolt/Nut(s)

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Hand tight or low torque is critical to preventing damage to the components. Estimated value

Engine Mounting

Specifications for bolts related to the engine mounts.

1

Engine Mount Bolts (to engine block)

M12 x 1.75
Important Notes
Engine mount bolts often involve a multi-step torque procedure. Follow the specific sequence specified in the official BMW service manual. Estimated values provided

Accessory Drive

Specifications for bolts related to accessory drive components.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tensioner alignment and operation after installation.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment and smooth operation of the idler pulley.

Engine Lifting

Specifications for bolts used to secure the engine lifting eyes

1

Engine Lifting Eye Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure lifting eyes are securely attached and free from damage.

Spark Plugs

Specifications for spark plug installation.

1

Spark Plugs

M14 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure correct spark plug gap and do not over-torque as this could damage the threads in the cylinder head.

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

Why are torque specifications so important when working on the S85 engine?

Correct torque ensures proper clamping force, preventing leaks, component failure, and engine damage. Over-torquing can strip threads or deform parts, while under-torquing may lead to loosening and leaks. For example, improperly torqued rod bolts can lead to catastrophic engine failure.

Q2

Should I use new bolts when reassembling the S85 engine?

Yes, in many cases, particularly for critical fasteners like cylinder head bolts, connecting rod bolts, and main bearing bolts, new bolts are essential. These bolts often undergo a 'stretch' when torqued to specification. Reusing them can compromise their clamping ability. Reusing the old bolts on the valve cover is acceptable, but ensure that the rubber grommets are not damaged and in good condition.

Q3

What type of lubricant should I use on engine bolts before tightening?

Typically, a light coating of engine oil or the manufacturer's specified lubricant should be used on the bolt threads unless otherwise indicated (e.g., some bolts are designed to be installed dry). This ensures accurate torque readings and prevents galling or seizing of threads. Do NOT use anti-seize unless specifically required and indicated by the manufacturer. Improper lubricant can lead to inaccurate torque.

Q4

Do I need any special tools to torque the bolts on the S85 engine?

Yes, a high-quality torque wrench that is calibrated regularly is crucial. Many critical bolts on the S85 also require an angle-torque procedure (torque to a spec, then turn a specific angle). An angle measurement tool will also be required for correct tightening procedures.

Q5

Where can I find the correct torque specs for my S85 engine?

The official BMW repair manual (TIS) for your specific year M6 is the most reliable source. Always verify the specifications with the manufacturer's guidelines. Using generic specs or assumptions can result in serious 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

Torque Wrench

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values. Both click-type and digital torque wrenches are suitable, but a click-type is recommended for most applications.

  • Ability to measure and apply specific torque values
  • Audible click indicates achieved torque (for click-type)
Learn more

Socket Set (Metric)

A comprehensive metric socket set is necessary to fit various bolt head sizes found on the S85 engine. A 1/2-inch drive set is recommended for larger bolts, while a 3/8-inch set is suitable for smaller fasteners.

  • Various sizes for different bolt heads
  • Durable construction to withstand torque application
Learn more

Torx Socket Set

Torx sockets are required for specific bolts on the S85 engine, particularly on components such as the valve covers and throttle bodies.

  • Precise fit for torx bolt heads
  • Hardened steel for durability
Learn more

Extension Bars

Extension bars of various lengths may be required to access some bolt locations.

  • Extend reach to recessed areas
  • Various sizes and lengths to accommodate different situations
Learn more

Universal Joint

Universal joints may be required when access to a bolt head isn't straight or at an angle

  • Enables wrench to reach bolts in difficult or hard to access locations
  • Durable construction
Learn more
Service Procedures

Valve Cover Bolt Torque Procedure

This procedure outlines how to properly torque the valve cover bolts on the S85 engine. Incorrect torque can lead to leaks.

  • Clean the valve cover and cylinder head mating surfaces.
  • Install new valve cover gaskets.
  • Install the valve cover and new mounting bolts.
  • Tighten all bolts finger-tight in a criss-cross pattern.
  • Torque valve cover bolts to 8-10 Nm (71-89 in-lb) in a criss-cross pattern.
  • Verify torque again and inspect for proper gasket compression.
View full procedure

Rod Bearing Cap Bolt Torque Procedure

This procedure outlines how to properly torque the rod bearing cap bolts on the S85 engine. Incorrect torque can lead to engine damage.

  • Apply clean engine oil to the rod bearing bolt threads and under the bolt heads.
  • Install rod bearing cap.
  • Install rod bearing bolts.
  • Torque all rod bolts to 20 Nm (15 ft-lb) in sequence.
  • Rotate rod bolt another 70 degrees ± 5 degrees
  • Verify torque.
View full procedure

Main Bearing Cap Bolt Torque Procedure

This procedure outlines how to properly torque the main bearing cap bolts on the S85 engine. Incorrect torque can lead to engine damage.

  • Apply clean engine oil to the main bearing bolt threads and under the bolt heads.
  • Install main bearing cap.
  • Install main bearing bolts.
  • Torque all main bolts to 20 Nm (15 ft-lb) in sequence.
  • Rotate each main bolt another 60 degrees ± 5 degrees.
  • Verify torque.
View full procedure

Oil Pan Bolt Torque Procedure

This procedure outlines how to properly torque the oil pan bolts on the S85 engine. Incorrect torque can lead to leaks.

  • Clean the oil pan and engine block mating surfaces.
  • Install new oil pan gasket.
  • Install oil pan.
  • Install oil pan bolts.
  • Tighten all bolts finger tight.
  • Torque all bolts to 10-12 Nm (89-106 in-lb) in a criss-cross pattern.
  • Verify torque.
View full procedure

Intake Manifold Bolt Torque Procedure

This procedure outlines how to properly torque the intake manifold bolts on the S85 engine.

  • Install intake manifold and gasket.
  • Install intake manifold bolts.
  • Tighten all bolts finger tight.
  • Torque all bolts to 20-22 Nm (15-16 ft-lb) in a criss-cross pattern.
  • Verify torque.
View full procedure
Technical Service Bulletins

S85 Engine Oil Leak Diagnosis

2009-07-15

This bulletin addresses common oil leaks found on the S85 engine. Incorrectly torqued valve covers and oil pan bolts are a common cause of oil leaks. Check all mating surfaces, gaskets and bolt torque if a leak is found.

2005-2010 M5 2005-2010 M6

Resolution: Ensure all bolts are tightened to the correct torque specification in a criss-cross pattern. Replace gaskets if necessary.

S85 Connecting Rod Bolt Torque Update

2008-03-22

This bulletin provides revised torque specifications for connecting rod bolts. It is critical to follow the new specifications to avoid engine damage.

2005-2010 M5 2005-2010 M6

Resolution: Use the revised torque specification of 20 Nm + 70 degrees ± 5 degrees for connecting rod cap bolts. Ensure all threads are lubricated.

S85 Main Bearing Bolt Torque Recommendation

2007-09-01

This bulletin clarifies the proper main bearing cap bolt torque procedure. Incorrect torque procedure can result in engine damage.

2005-2010 M5 2005-2010 M6

Resolution: Use the torque procedure of 20 Nm + 60 degrees ± 5 degrees for the main bearing bolts. Ensure all threads are lubricated.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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