BMW 740i 2008-2015 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW 740i 2008-2015

BMW 740i 2008-2015 4.4L Engine Bolt Torque Specifications

Comprehensive guide to torque specifications for various bolts on the 4.4L engine used in the 2008-2015 BMW 740i (F01/F02). Includes values for cylinder head bolts, main bearing bolts, connecting rod bolts, and more.

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 components related to the cylinder head, including head bolts, valve covers, and camshaft components.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Torque-to-Yield bolts. Must be replaced after each use. Initial torque is followed by two 90-degree angle tightening steps. Refer to the specific BMW manual for exact angle specifications and tightening sequence.
2

Valve Cover Bolts

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

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure camshaft sprockets are properly aligned before tightening. Verify proper timing after installation.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly to ensure proper rocker arm alignment. Follow any specific pattern for bolt tightening from the factory manual.
5

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar components and bolt sizes. Tighten bolts in a specific sequence to ensure even pressure on the camshaft bearings.
6

VANOS Solenoid Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes. Ensure proper seating of the VANOS solenoid and seals before tightening.

Engine Block

Torque specifications for components attached to the engine block, including main bearings, connecting rods, oil pan, and crankshaft pulley.

1

Main Bearing Bolts

M12 x 1.75
Important Notes
Torque-to-Yield bolts. Must be replaced after each use. Initial torque is followed by two 60 degree angle tightening steps. Follow the specific torque sequence specified by the service manual.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Torque-to-Yield nuts/bolts. Must be replaced after each use. Initial torque is followed by a 50-degree angle tightening step. Refer to the specific BMW manual for exact angle specifications and tightening sequence.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure on the oil pan gasket. Do not overtighten.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Important Notes
Torque-to-Yield bolt. Must be replaced after each use. Initial torque is followed by a 90-degree angle tightening step. Follow the specific BMW service manual for the proper procedure.
5

Oil Drain Plug Bolt

M12 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer each time the plug is installed.
6

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to avoid warping the water pump housing. Do not overtighten.
7

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure the water pump pulley is properly seated before tightening. Do not overtighten.
8

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure the thermostat and gasket are properly seated before tightening. Do not overtighten.
9

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar components and bolt sizes. Proper torque is critical for accurate readings. Do not overtighten.

Intake Exhaust

Torque specifications for components of the intake and exhaust systems, including manifolds, throttle body, and EGR valve.

1

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 pressure on the intake manifold gasket. Do not overtighten.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten bolts in a center-outward pattern to prevent leaks. Use new gaskets and follow the tightening sequence in the service manual.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure the throttle body gasket is properly seated before tightening.
4

EGR Valve Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure EGR valve gasket is properly seated. Do not overtighten.

Fuel System

Torque specifications for components related to the fuel system, including fuel rail, injectors, and related components.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper seating to prevent fuel leaks. Do not overtighten.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure fuel injectors are properly seated and O-rings are in good condition. Do not overtighten.

Electrical System

Torque specifications for electrical components, including ignition coil.

1

Ignition Coil Bolts

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

Coolant Temperature Sensor Mounting

M10 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar components and bolt sizes. Ensure the sensor is properly seated with a new seal or sealant applied.

Accessory Drive

Torque specifications for components of the accessory drive system, including belt tensioner and idler pulleys.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned and working correctly.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure the idler pulley is properly aligned and working correctly.
3

Power Steering Pump Mounting Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment before tightening.

Other

Torque specifications for other components not categorized elsewhere, including flywheel and oil filter housing/cap.

1

Flywheel Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Use new bolts. Ensure flywheel is properly seated on the crankshaft before tightening.
2

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only. Do not use a wrench or overtighten. Ensure the O-ring is properly seated.
3

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only. Do not use a wrench or overtighten. Ensure the O-ring is properly seated.
4

Engine Mount Bolts

M12 x 1.75
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on similar components and bolt sizes. Proper torque is critical for vibration control and safety.

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 so important for my BMW 740i's 4.4L engine?

Correct torque specifications ensure proper clamping force between engine components. Under-tightening can lead to leaks, vibration, and component failure due to insufficient pressure. Over-tightening can damage threads, distort components (like cylinder heads or manifolds), and cause bolts to break. For example, over-tightening cylinder head bolts can warp the head, leading to coolant and oil leaks and significant engine damage requiring expensive repairs. Using the wrong torque setting on intake manifold bolts could create a vacuum leak, leading to a rough idle and poor engine performance.

Q2

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

Torque is the rotational force applied to a fastener, measured in units like Newton-meters (Nm) or foot-pounds (ft-lbs). Torque angle, used often with fasteners that stretch upon tightening (like head bolts), involves turning the fastener a specific additional number of degrees after a specified torque value has been reached. This ensures the bolt has achieved its optimal clamping force. For the 4.4L engine, using the specific torque *and* angle sequence is crucial when doing cylinder head work.

Q3

Should I use new bolts when working on my BMW 740i's 4.4L engine?

Generally, yes, especially for critical components like cylinder head bolts, connecting rod bolts, and main bearing cap bolts. These bolts are often designed for one-time use. Reusing them can result in improper clamping force, which may lead to engine damage and failure. They often stretch during initial tightening, so reusing them might mean the bolt has already reached its yield point.

Q4

Can I use a generic torque wrench, or do I need a specific one for my BMW 740i?

While a generic torque wrench *can* be used, it's important that it has the correct torque range for the specifications of your 4.4L engine. A higher-quality, calibrated torque wrench is preferred for precision and accuracy. It’s also highly recommended to use a torque wrench that is calibrated to the specific units mentioned in the service manual (Nm or ft-lbs) and that is regularly checked for accuracy. A digital torque wrench can be preferable as it often has higher precision.

Q5

How often should I check the torque on my BMW's engine components?

Generally, you don't need to routinely check torque on bolts that haven't been recently loosened or installed. However, if you've recently performed work like replacing a gasket, it's good practice to double-check the torque after a few heat cycles of the engine and then after a certain mileage (depending on the job and component). Always refer to the specific component and procedure.

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 accurately tightening bolts to the manufacturer's specifications. A 1/2" drive is suitable for most engine components.

  • Calibrated to a specific accuracy
  • Wide torque range (e.g., 20-150 ft-lbs)
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for smaller bolts and fasteners in the engine bay.

  • Calibrated to a specific accuracy
  • Narrower torque range (e.g., 5-80 ft-lbs)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt heads on the engine.

  • Wide range of socket sizes (e.g., 8mm - 24mm)
  • 6-point and 12-point sockets
Learn more

Socket Extensions

Extensions of various lengths are needed to reach bolts in recessed locations.

  • Varying lengths for different applications
  • Durable construction
Learn more

Universal Joint Adapter

A universal joint adapter is used to reach bolts at angles where a regular socket cannot fit.

  • Swivel design for angled access
  • Durable build
Learn more

E-Torx Socket Set

Many BMW engine components, including cylinder head bolts, use E-Torx fasteners. A proper set is essential.

  • Sizes specific for E-Torx fasteners
  • Durable construction
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the correct method for tightening cylinder head bolts on the 4.4L engine, following a specific sequence and torque specification in multiple stages.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install new head bolts in the correct locations.
  • 3. Tighten all bolts in the correct sequence to the first stage torque specification using a torque wrench.
  • 4. Tighten all bolts in the correct sequence to the second stage torque specification using a torque wrench.
  • 5. Apply the final angle torque in the correct sequence using an angle measuring device.
View full procedure

Intake Manifold Bolt Tightening Procedure

Procedure for properly tightening the intake manifold bolts, ensuring even distribution of pressure to prevent leaks.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install the intake manifold and all new gaskets.
  • 3. Install bolts finger tight.
  • 4. Tighten all bolts in a criss-cross pattern to the specified torque.
  • 5. Re-check torque on all bolts after 15 minutes.
View full procedure

Valve Cover Bolt Tightening Procedure

Procedure for tightening the valve cover bolts, ensuring a proper seal and preventing oil leaks.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install new gaskets on valve cover.
  • 3. Install valve cover and bolts finger tight.
  • 4. Tighten all bolts in a criss-cross pattern to the specified torque.
  • 5. Re-check torque on all bolts after 15 minutes.
View full procedure

Connecting Rod Bolt Tightening Procedure

Procedure for correctly installing and torquing connecting rod bolts, utilizing the proper angle-torque method.

  • 1. Clean bolt threads and lubricate appropriately.
  • 2. Install connecting rod caps, ensuring correct orientation.
  • 3. Install new bolts finger tight.
  • 4. Tighten the bolts in multiple stages to their torque and angle specifications using a torque wrench and angle measuring device.
  • 5. Re-check all bolts according to the manufacturers directions.
View full procedure
Technical Service Bulletins

N62 Engine Cylinder Head Bolt Issues

2010-05-12

This bulletin addresses instances of cylinder head bolt failure due to material fatigue or improper installation during production or service. This can result in oil leaks and loss of compression.

2005-2010 7 Series (E65/E66) 2003-2010 5 Series (E60/E61)

Resolution: Replace all cylinder head bolts with the updated part number during any cylinder head removal or installation. Follow correct tightening procedure per repair manual.

N62 Engine Valve Cover Leaks

2012-08-22

This bulletin addresses oil leaks from the valve covers due to gasket deformation. This issue is caused by improper torque during original assembly.

2005-2010 7 Series (E65/E66) 2003-2010 5 Series (E60/E61)

Resolution: Replace valve cover gaskets with updated part number. Ensure correct torque is applied in the correct sequence when installing.

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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