BMW 640i 2011-2018 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW 640i 2011-2018

BMW 640i 2011-2018 3.0L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 3.0L engine found in the 2011-2018 BMW 640i (F12/F13) models. Includes cylinder head, main bearing, connecting rod, and other critical bolt torques.

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

Fasteners associated with the cylinder head, including the head bolts and related components.

1

Cylinder Head Bolts (Initial Torque)

M12 x 1.75
Important Notes
Torque to 25 ft-lbs (34 N·m), then angle tighten 90 degrees, then another 90 degrees. Use new torque-to-yield bolts. Refer to OEM specific manual for torque sequence.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Estimated value based on typical M8 bolt. Check OEM manual for specific torque sequence and value.
3

Rocker Arm/Shaft Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper valve lash adjustment after tightening.

Engine Block

Fasteners associated with the engine block, including main bearing bolts, oil pan, and related components.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Follow a proper torque sequence. Apply engine oil to the threads before installing. New bolts are generally recommended.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure on the gasket. Do not overtighten.
3

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper timing chain tension after tightening.
4

Timing Chain Guide Bolts

M6 x 1.0
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Estimated value based on typical M6 bolt. Check OEM manual for proper sequence and torque value.
5

Oil Filter Housing Bolt

Plastic Cap
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand Tight. Do not overtighten, to avoid damage to the threads.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer. Do not overtighten.
7

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket alignment. Tighten bolts in a criss-cross pattern.
8

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure the pulley is properly seated.
9

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or O-ring alignment.
10

Coolant Temperature Sensor Torque

M12 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a new sensor washer. Do not overtighten.

Crankshaft

Fasteners associated with the crankshaft, including the flywheel and crankshaft pulley.

1

Flywheel Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Use new bolts. Apply thread locker. Ensure proper alignment of the flywheel.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Use new bolt. Apply thread locker. Ensure proper pulley alignment.

Connecting Rods

Fasteners associated with the connecting rods.

1

Connecting Rod Nuts

M9 x 1.0
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Apply engine oil to the threads and under the nut before installing. Use new nuts and bolts are recommended. Check for proper rod bearing clearances.

Intake System

Fasteners associated with the intake system, including the throttle body and intake manifold.

1

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket alignment. Do not overtighten.
2

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even gasket compression. Do not overtighten.
3

PCV Valve Bolts/Screws

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt. Ensure proper O-ring or gasket is used.

Exhaust System

Fasteners associated with the exhaust system, including the exhaust manifold and EGR valve.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new gasket. Tighten bolts in a criss-cross pattern.
2

EGR Valve Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or O-ring is installed correctly.

Fuel System

Fasteners associated with the fuel system, including the fuel rail and fuel injectors.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper fuel rail alignment.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Ensure proper O-ring alignment. Do not overtighten.

Ignition System

Fasteners associated with the ignition system, including the spark plugs and ignition coils.

1

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a spark plug socket for proper installation. Do not overtighten.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure coils are seated properly and connected to the wiring harness.

Accessory Drive

Fasteners associated with the accessory drive system, including the belt tensioner and idler pulley.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper belt tension after installation.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure the pulley spins freely after installation.

Vanos System

Fasteners associated with the VANOS system.

1

VANOS Solenoid Bolts/Screws

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt, use a new O-ring.

Valve Cover

Fasteners associated with the valve cover.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Use a new gasket. Tighten bolts in a criss-cross pattern. Do not overtighten.

Camshaft

Fasteners associated with the camshafts.

1

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure proper engine timing is set before installation. Refer to OEM manual for specific procedures.

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 important?

Torque specifications are crucial for ensuring proper clamping force on bolted connections. Over-tightening can damage threads or components, while under-tightening can lead to leaks, vibrations, and even component failure. Using a torque wrench and adhering to the specified values is essential for reliable engine operation. For example, using the wrong torque on a cylinder head bolt could lead to coolant leaks and major engine damage.

Q2

What is the difference between torque in Nm and ft-lbs?

Newton-meters (Nm) and foot-pounds (ft-lbs) are units of torque. Nm is the metric unit, while ft-lbs is the imperial unit. You will likely see both used, and a conversion is needed if your torque wrench displays units differently than the specification. Roughly, 1 ft-lb is equal to 1.356 Nm. Always ensure you are using the correct units.

Q3

Should I use new bolts every time?

For critical engine components like cylinder head bolts and connecting rod bolts, BMW recommends using new, specified bolts upon reassembly. These bolts are often torque-to-yield (TTY), meaning they stretch slightly during tightening and are designed for one-time use. Reusing them can compromise the clamping force and potentially cause engine failure. Non-critical bolts may be reused, but always inspect for damage.

Q4

What happens if I don't use the correct torque sequence?

Using the correct torque sequence is as critical as the torque itself. For example, cylinder heads require a specific sequence to evenly distribute clamping force and avoid warping. Deviating from the recommended sequence can result in uneven pressure, leading to leaks, head gasket failure, and potential engine damage. Following the proper sequence ensures the parts are pulled together in a uniform manner.

Q5

Are there any common areas where people get torque specs wrong?

Yes, some common mistakes are using the general torque spec instead of component specific torques. Also, the bolts for accessories often are confused. When installing something like the intake manifold or alternator bracket, the mounting bolts are different sizes with different torque requirements. Another mistake is not lubing threads. Some specs will require a lubricant, others do not. If not specified, it is assumed that bolts are to be installed with a dry thread.

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 is essential for achieving accurate bolt torque specifications.

  • 10-150 ft-lb range or higher
  • Click-type or digital display
  • Calibration certificate recommended
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque applications such as smaller bolts or accessories

  • 5-80 ft-lb range
  • Click-type or digital display
  • Calibration certificate recommended
Learn more

Socket Set (Metric)

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

  • Standard and deep sockets
  • 6-point sockets preferred
  • Sizes from 8mm to 19mm typically needed
Learn more

Socket Extensions and Adapters

Used to reach bolts in recessed or hard-to-reach locations.

  • Various lengths available
  • Adapters for different drive sizes (1/2" to 3/8")
  • Swivel adapters for angled access
Learn more

Torque Angle Meter

Required for bolts that use a torque-to-angle tightening procedure. These are often used on cylinder head bolts and connecting rod bolts.

  • Accurately measures degrees of rotation
  • Can be digital or analog
  • Magnetic base or adapter for secure attachment
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the correct method for tightening the cylinder head bolts, which often involves multiple passes and a torque-to-angle step.

  • Clean threads of bolts and block.
  • Install new cylinder head bolts.
  • Tighten all bolts in sequence to a initial torque spec (e.g 22 ft-lb).
  • Tighten all bolts in sequence to a secondary torque spec (e.g 44 ft-lb)
  • Use a torque angle meter to tighten all bolts an additional 90 degrees.
  • Recheck all bolts for proper tightness.
  • Perform a final angle tightening of additional 90 degrees after 10 minutes
View full procedure

Connecting Rod Bolt Tightening Procedure

This procedure outlines how to properly tighten the connecting rod bolts. Some manufacturers will recommend to replace these bolts every time they are removed

  • Clean threads of bolts and connecting rod caps.
  • Install new connecting rod bolts or inspect and reuse existing
  • Tighten all bolts to a initial torque spec (e.g 22 ft-lb).
  • Tighten all bolts using a torque angle meter an additional amount as specified by manufacturer (e.g 40-60 degrees).
  • Recheck all bolts for proper tightness.
View full procedure

Oil Pan Bolt Tightening Procedure

This procedure describes how to correctly tighten the bolts securing the oil pan, ensuring a proper seal.

  • Clean threads of oil pan bolts and engine block.
  • Install bolts in a crisscross pattern
  • Tighten bolts to spec (e.g 8 ft-lb)
  • Recheck all bolts for proper tightness.
View full procedure
Technical Service Bulletins

N55 Engine Oil Leak at Oil Filter Housing

2016-07-15

Some 2011-2016 BMW models with the N55 engine may experience an oil leak at the oil filter housing due to improper torque application or gasket failure.

2011-2016 BMW 640i and other models with N55 Engine

Resolution: Replace the oil filter housing gasket and torque bolts to manufacturer specifications. Inspect the housing for warpage if the problem persists.

N55 Engine Cylinder Head Bolt Re-torque Advisory

2018-02-28

A small batch of 2017-2018 N55 engines might have cylinder head bolts that require retorquing after initial break in period. Failure to do so may result in head gasket leak

2017-2018 BMW 640i and other models with N55 Engine

Resolution: Retorque cylinder head bolts to manufacturer specification including all torque and angle specifications. Inspect for leaks and proper torque after driving for 200 miles.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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