BMW M6 2012-2018 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW M6 2012-2018

BMW M6 2012-2018 4.4L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for various bolts on the 4.4L V8 engine found in the 2012-2018 BMW M6 (F12, F13, and F06 generation). Includes critical tightening torques for components like the cylinder head, crankshaft, and connecting rods.

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

Torque specifications for bolts related to the cylinder head assembly, including bolts securing the head to the block and valve train components.

1

Cylinder Head Bolts

M12 x 1.5
Important Notes
Use new bolts. Follow the specific torque sequence outlined in the BMW service manual. Torque in three steps: initial torque, then two 90 degree turns.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten the valve cover bolts in a criss-cross pattern.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten evenly to ensure proper rocker arm function.
4

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Ensure proper camshaft alignment before tightening.
5

Variable Valve Timing (VANOS) Unit Bolts (Lower Torque)

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Estimated value based on common M8 bolts. Check specific repair manual.
6

Variable Valve Timing (VANOS) Unit Bolts (High Torque/Central Bolt)

M12 x 1.5
Torque Value
34 ft-lbs (46 N·m)
Important Notes
Estimated value based on common M12 bolts. Check specific repair manual.
7

VANOS Solenoid Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10 N·m)
Important Notes
Tighten evenly to ensure proper solenoid seating. Do not over tighten.

Engine Block

Torque specifications for bolts related to the engine block, including main bearing caps and oil pan.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Follow specific torque sequence. Final torque value provided, further steps may be needed based on manufacturer recommendations.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten in a criss-cross pattern. Multiple stages and sequences may be required, refer to specific manual.
3

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper seating of the oil filter housing O-ring before tightening.
4

Oil Drain Plug

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer. Do not over tighten.

Rotating Assembly

Torque specifications for bolts related to the crankshaft, connecting rods, and flywheel.

1

Connecting Rod Nuts

M9 x 1.0
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper bearing crush when tightening.
2

Flywheel Bolts

M12 x 1.5
Torque Value
75 ft-lbs (101 N·m)
Important Notes
Ensure flywheel is properly seated against the crankshaft flange.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Use a new bolt if recommended by manufacturer.

Induction And Exhaust

Torque specifications for bolts related to the intake and exhaust systems, including manifolds, throttle body, EGR valve, and fuel rail.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a specific sequence per the BMW repair manual. Multiple stages may be required.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts in a specific sequence per the BMW repair manual. Multiple stages may be required.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure proper throttle body seating.
4

EGR Valve Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper EGR valve alignment before tightening.
5

Fuel Rail Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure proper rail seating.
6

High Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to ensure proper mounting.

Cooling System

Torque specifications for bolts related to the cooling system, including the water pump and thermostat housing.

1

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper sealing of the water pump gasket.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent pulley imbalance.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper seating of the thermostat and gasket.
4

Oil Cooler Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper oil cooler seating and gasket placement.
5

Coolant Line Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent coolant leaks.

Turbocharging System

Torque specifications for bolts related to the turbocharging system, including turbocharger mounting and oil lines.

1

Turbocharger Mounting Bolts (To Manifold)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly in a cross pattern to ensure secure mounting.
2

Turbocharger Mounting Bolts (Manifold to Head)

M10 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten evenly in a cross pattern to ensure secure mounting.
3

Turbocharger Oil Feed/Return Line Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper sealing and prevent oil leaks.

Ignition System

Torque specifications for bolts related to the ignition system, including spark plugs and ignition coils.

1

Spark Plugs

M14 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure proper seating to achieve proper heat transfer and prevent compression leaks.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly for proper contact to spark plugs.

Fuel System

Torque specifications for bolts related to fuel injectors.

1

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten to ensure proper seating and sealing.

Other

Torque for miscellaneous components.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper tension on the timing chain, do not over or under tighten.
2

Oil Filter Cap

N/A
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Tighten by hand, then additionally 1/4 turn to ensure proper sealing. Final torque value provided is a typical hand tight torque to ensure sealing with an o-ring.

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 correct torque specifications important when working on the 4.4L engine?

Using the correct torque specifications ensures proper clamping force on components. Under-torquing can lead to leaks, vibrations, and component failure, while over-torquing can damage threads, deform parts, or cause bolt breakage. For example, improperly torqued cylinder head bolts can lead to head gasket failure and severe engine damage. Adhering to the manufacturer's specified torque values is crucial for reliability and safety.

Q2

What type of torque wrench should I use when tightening bolts on the 4.4L engine?

A calibrated torque wrench, either click-type or digital, is essential. It is recommended to use a torque wrench that operates within the range of the specified torque values. Avoid using uncalibrated or low-quality wrenches, as this can lead to inaccurate tightening. Regularly calibrate your torque wrench to maintain accuracy. For instance, a low-range torque wrench might be used for smaller bolts and a high-range wrench for the larger ones like those on the cylinder head or crankshaft.

Q3

Should I replace bolts when working on the 4.4L engine?

Certain bolts, especially those used in critical areas like cylinder heads and connecting rods, are torque-to-yield (TTY) bolts. These are designed to stretch slightly upon tightening and should be replaced every time they are removed. Refer to the BMW repair manual to identify TTY bolts. Reusing TTY bolts can result in improper clamping force and component failure. For example, reusing the rod cap bolts is a common source of engine failure after rebuilds.

Q4

What should I do if I suspect a bolt was over-torqued on the 4.4L engine?

If you suspect a bolt has been over-torqued, it is crucial to inspect it for damage. Check for thread deformation and bolt stretching. If either is found, the bolt and possibly the corresponding threaded hole must be inspected and replaced if necessary. In some cases, it's prudent to replace both the bolt and the mating part. For example, an over-torqued exhaust manifold bolt could crack the manifold itself.

Q5

Where can I find reliable torque specifications for the 4.4L engine?

The most reliable source for torque specifications is the official BMW repair manual or a reputable third-party database that is specifically tailored for the 4.4L engine in the 2012-2018 M6 (F12/F13/F06). Avoid relying on generic specifications found online that may be inaccurate or outdated. Always double-check your information and cross-reference with multiple reliable sources before beginning any work.

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 (1/2" Drive)

A high-quality 1/2" drive torque wrench is essential for accurately tightening bolts to the specified torque values. Range should cover the torque specifications for the engine.

  • Click-type mechanism for accurate readings
  • Calibrated for precise torque application
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is recommended for smaller bolts and tighter spaces, often used for the intake manifold, valve covers, and various sensors.

  • Smaller form factor for better maneuverability
  • Click-type mechanism for accurate readings
Learn more

Socket Set (Metric)

A comprehensive metric socket set, including deep and shallow sockets, is required to fit all the various bolt and nut sizes on the engine.

  • Includes a wide range of metric sizes
  • Durable construction for heavy-duty use
Learn more

Socket Extensions

Socket extensions of varying lengths are necessary to reach recessed or difficult-to-access bolts.

  • Provides access to hard-to-reach areas
  • Available in different lengths
Learn more

Universal Joint

A universal joint allows for angled access to bolts, especially helpful in confined engine compartments.

  • Allows socket to operate at an angle
  • Durable construction
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening cylinder head bolts on the 4.4L engine.

  • Clean the cylinder head and engine block mating surfaces thoroughly.
  • Install the cylinder head and new bolts.
  • Torque all bolts to 20 Nm (15 lb-ft) in the specified sequence.
  • Torque all bolts again to 60 Nm (44 lb-ft) in the same sequence.
  • Angle tighten all bolts an additional 90 degrees in the same sequence.
  • Angle tighten all bolts an additional 90 degrees again in the same sequence.
View full procedure

Connecting Rod Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening connecting rod bolts on the 4.4L engine.

  • Clean connecting rod and cap surfaces.
  • Install connecting rod cap and new bolts.
  • Torque all bolts to 20 Nm (15 lb-ft).
  • Angle tighten all bolts an additional 70 degrees.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening main bearing cap bolts on the 4.4L engine.

  • Clean main bearing cap and block surfaces.
  • Install main bearing caps and new bolts.
  • Torque all bolts to 20 Nm (15 lb-ft).
  • Angle tighten all bolts an additional 70 degrees.
View full procedure

Intake Manifold Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening intake manifold bolts on the 4.4L engine.

  • Position the intake manifold on the cylinder heads.
  • Install new intake manifold bolts.
  • Torque all bolts to 10 Nm (7 lb-ft) in the specified sequence.
View full procedure

Valve Cover Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening valve cover bolts on the 4.4L engine.

  • Position the valve cover on the cylinder head.
  • Install new valve cover bolts.
  • Torque all bolts to 10 Nm (7 lb-ft) in the specified sequence.
View full procedure
Technical Service Bulletins

Incorrect Cylinder Head Bolt Torque Specification

2015-06-15

Some early models may have experienced cylinder head sealing issues due to incorrect torque specifications in the original workshop manuals. This bulletin corrects the torque values and tightening procedures.

2012-2014

Resolution: Follow the updated cylinder head bolt tightening procedure detailed in this bulletin. Torque to 20 Nm (15 lb-ft) + 60 Nm (44 lb-ft) + 90 degrees + 90 degrees.

Connecting Rod Bolt Stretch Issues

2016-11-22

Some connecting rod bolts may exhibit premature stretching. Use only new bolts and follow the revised angle tightening process precisely.

2012-2016

Resolution: Use only new connecting rod bolts and tighten to 20 Nm (15 lb-ft) + 70 degrees. Discard any bolts used previously.

Main Bearing Cap Bolt Torque Procedure Update

2017-02-01

Updates to the main bearing cap bolt tightening procedure have been released due to concerns with proper sealing.

2012-2017

Resolution: Follow the revised tightening sequence. Torque to 20 Nm (15 lb-ft) + 70 degrees. Ensure the surface is free of contaminants.

About the Author

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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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