BMW 650i 2012-2017 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW 650i 2012-2017

BMW 650i 2012-2017 4.4L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 4.4L engine in the 2012-2017 BMW 650i (F12/F13) model, including cylinder head bolts, connecting rod bolts, main bearing bolts, and other critical engine 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 is critical for maintaining a proper seal, preventing leaks, and ensuring proper combustion pressures. These bolts are typically torque-to-yield (TTY).

1

Cylinder Head Bolts

M12 x 1.5
Important Notes
Cylinder head bolts are torque-to-yield and must be replaced after removal. Torque in a specific sequence starting from the center bolts working outwards, and then again at the angle steps. Use a new, clean, lubricated bolt with engine oil. Estimated angle value. Consult vehicle-specific manual.

Engine Block

Specifications for bolts securing components to the engine block including main bearing caps.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Main bearing bolts are torque-to-yield and should be replaced after removal. Torque in the correct sequence. Estimated angle value. Consult vehicle-specific manual.
2

Oil Pan Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque in a criss-cross pattern. Be careful not to overtighten and damage the gasket.
3

Water Pump Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly to prevent leaks.
4

Oil Filter Housing Bolt

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Torque evenly to prevent leaks.
5

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new washer and torque to prevent oil leaks.
6

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly to prevent coolant leaks. Estimated bolt size.

Rotating Assembly

Specifications for fasteners used in the rotating assembly.

1

Connecting Rod Nuts

M10 x 1.25
Important Notes
Connecting rod bolts are torque-to-yield and should be replaced after removal. Torque in the correct sequence. Estimated angle value. Consult vehicle-specific manual.
2

Flywheel Bolts

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Apply thread locking compound and torque evenly. These may be torque to yield, consider replacing.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Important Notes
This bolt is torque-to-yield and should be replaced after removal. Torque to the specified torque and angle values. Estimated angle value. Consult vehicle-specific manual.

Valve Train

Specifications for fasteners in the valve train including camshafts and rocker arms.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque in a criss-cross pattern to avoid damaging the gasket.
2

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Torque evenly, do not over tighten.
3

Camshaft Sprocket Bolts

M10 x 1.25
Important Notes
Torque in a specific sequence. May be torque-to-yield and require replacement after removal. Estimated angle value. Consult vehicle-specific manual.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque evenly.

Intake System

Specifications for fasteners used in the intake system.

1

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not over tighten and damage the throttle body.
2

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque in a specific sequence starting from the center bolts working outwards. Consult vehicle-specific manual.

Exhaust System

Specifications for fasteners used in the exhaust system.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Torque in a specific sequence. These can loosen due to heat cycles. May need to be retorqued. Consult vehicle-specific manual.
2

Exhaust Manifold/Headers Studs

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque to prevent damage to the threads. Estimated value.

Fuel System

Specifications for fasteners used in the fuel system.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly to prevent fuel leaks. Estimated bolt size.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly to prevent fuel leaks. Estimated bolt size.

Ignition System

Specifications for fasteners used in the ignition system.

1

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Torque to ensure a good seal and proper heat transfer. Do not overtighten.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly to prevent vibration. Estimated bolt size.

Sensors

Specifications for fasteners securing various engine sensors.

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly and do not over tighten.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly and do not over tighten.
3

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque evenly. Estimated bolt size.

Cooling System

Specifications for fasteners related to the cooling system.

1

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Torque evenly. Estimated bolt size.

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?

Correct torque is crucial to ensure proper clamping force, preventing loosening due to vibration, and avoiding damage to threads or components. Overtightening can lead to stripped threads, broken bolts, or distorted parts, while undertightening can cause leaks or component failure. For example, incorrect torque on the cylinder head bolts could result in head gasket failure, requiring extensive repairs.

Q2

Should I use new bolts every time when reassembling my 4.4L engine?

It's highly recommended to use new bolts, especially for critical components like cylinder head bolts, connecting rod bolts, and main bearing cap bolts. These are often torque-to-yield (TTY) or torque-angle bolts, which stretch upon installation and are not designed for reuse. Reusing TTY bolts can lead to incorrect clamping force and subsequent engine damage. Using new bolts ensures consistent and reliable performance.

Q3

What is the difference between torque and torque-angle specifications?

Torque specifications indicate how much rotational force to apply. Torque-angle specifications involve tightening to a specific torque and then rotating the bolt a specific number of degrees. This method ensures precise clamping force, especially with TTY bolts. For instance, some 4.4L engine components require an initial torque followed by a rotation of 90 or 180 degrees, which guarantees correct tension.

Q4

What type of lubricant should be used on threaded fasteners?

Generally, a light coat of engine oil is recommended for most threaded fasteners, unless specified otherwise. Using the incorrect lubricant, or applying too much, can affect the torque reading significantly, causing incorrect clamping force. For example, a lubricated bolt will tighten more with the same torque than a dry one, so it's important to follow the specification. Avoid using thread locker unless specified.

Q5

What if I don't have a torque wrench?

While it might be tempting to estimate, it's never recommended to work without a torque wrench when assembling an engine. You can't accurately judge torque by hand, so using a properly calibrated torque wrench is crucial for proper and safe assembly of the 4.4L engine components. Rental tools are available at many auto parts stores.

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 calibrated torque wrench capable of measuring torque values within the range specified for the engine bolts.

  • Accurate torque application
  • Audible click when target torque is reached
Learn more

Torque Wrench (3/8" Drive)

A smaller calibrated torque wrench for lower torque applications, such as valve cover bolts.

  • Accurate torque application for smaller fasteners
  • Audible click when target torque is reached
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt head sizes found on the engine.

  • Durable construction
  • Wide range of sizes
Learn more

Socket Extensions

Socket extensions of various lengths to reach recessed bolts.

  • Improved access to hard-to-reach fasteners
  • Increased versatility
Learn more

Universal Joint

A universal joint to reach fasteners at an angle.

  • Ability to torque bolts at various angles
  • Allows for proper torque application in difficult locations
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Procedure for tightening cylinder head bolts on the N63 engine.

  • Clean all threads of bolts and cylinder block.
  • Install cylinder head and new bolts loosely.
  • Tighten all bolts to 40 Nm (30 ft-lb) in the specified sequence.
  • Tighten all bolts to 60 Nm (44 ft-lb) in the specified sequence.
  • Tighten all bolts an additional 90 degrees in the specified sequence.
  • Tighten all bolts an additional 90 degrees in the specified sequence.
  • Verify all bolts are tightened to final specification.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Procedure for tightening main bearing cap bolts on the N63 engine.

  • Clean all threads of bolts and engine block.
  • Install main bearing caps and new bolts loosely.
  • Tighten all bolts to 20 Nm (15 ft-lb) in the specified sequence.
  • Tighten all bolts to 40 Nm (30 ft-lb) in the specified sequence.
  • Tighten all bolts an additional 60 degrees in the specified sequence.
View full procedure

Connecting Rod Bolt Torque Procedure

Procedure for tightening connecting rod bolts on the N63 engine.

  • Clean all threads of bolts and connecting rod caps.
  • Install connecting rod caps and new bolts loosely.
  • Tighten all bolts to 20 Nm (15 ft-lb) in the specified sequence.
  • Tighten all bolts to 40 Nm (30 ft-lb) in the specified sequence.
  • Tighten all bolts an additional 60 degrees in the specified sequence.
View full procedure

Valve Cover Bolt Torque Procedure

Procedure for tightening valve cover bolts on the N63 engine.

  • Clean valve cover surface and cylinder head surface
  • Install new valve cover gasket and the valve cover.
  • Install valve cover bolts loosely
  • Tighten all bolts to 10 Nm (7 ft-lb) in the specified sequence.
View full procedure
Technical Service Bulletins

N63 Engine Cylinder Head Bolt Re-Torque

2014-05-15

Some N63 engines have experienced cylinder head bolt loosening, potentially leading to leaks. A re-torque procedure may be required.

2012-2014 BMW 650i

Resolution: Re-torque cylinder head bolts to 40 Nm, then 60 Nm, followed by 90 degrees and 90 degrees in the correct sequence.

N63 Engine Oil Leak Diagnosis

2015-08-20

Addresses potential oil leaks from the valve cover and main seals that may require proper torque verification during the repair.

2012-2015 BMW 650i

Resolution: Inspect and torque valve cover bolts to 10 Nm in the specified sequence. Verify the proper torque application for the main bearing cap bolts during reassembly.

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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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