BMW 745i 2002-2009 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW 745i 2002-2009

BMW 745i 2002-2009 4.4L Engine Bolt Torque Specifications

Comprehensive torque specifications for various bolts on the 4.4L V8 engine found in the 2002-2009 BMW 745i, including cylinder head bolts, main bearing cap 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

Specifications for securing the cylinder head to the engine block. These are critical for maintaining proper compression and preventing coolant and oil leaks.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
These are torque-to-yield bolts. The angle torque is critical for proper sealing. Always replace bolts with new ones. Additional 90 degree angle turn is required after the initial 90 degree turn.

Crankshaft Assembly

Specifications for securing the crankshaft components, including main bearing caps, connecting rods, and flywheel. These are vital for smooth engine operation.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
These bolts likely require an additional angle torque. Always replace bolts with new ones.
2

Connecting Rod Nuts

M10 x 1.25
Important Notes
These nuts likely require an additional angle torque. Always replace nuts with new ones.
3

Flywheel Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Verify if an angle torque is needed. Bolts should be tightened in a star pattern
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Important Notes
This bolt likely requires an additional angle torque. Always replace bolt with a new one.

Camshaft System

Specifications for securing the camshaft components, such as camshaft sprockets and bearing caps, and valvetrain components such as rocker arms.

1

Camshaft Sprocket Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of camshaft and sprockets prior to torquing.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated value, use proper torque sequence.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure rocker arms are correctly positioned before tightening bolts.

Engine Timing

Specifications for securing the components of the engine's timing system.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure timing components are properly positioned before tightening bolt.

Engine Covers

Specifications for securing various engine covers, including valve covers and the oil pan.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage valve cover.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a cross pattern.

Intake System

Specifications for securing the intake manifold and throttle body.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even seal.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten, can damage throttle body.

Exhaust System

Specifications for securing exhaust manifold and EGR valve.

1

Exhaust Manifold/Headers Bolts

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

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure a proper seal.

Fuel System

Specifications for securing the fuel rail and fuel injectors.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Ensure fuel rail is seated correctly before tightening bolts.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage injectors.

Ignition System

Specifications for securing the spark plugs and ignition coils.

1

Spark Plugs

M14 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure spark plugs are properly seated before torquing.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten, can damage ignition coils.

Cooling System

Specifications for securing the water pump and thermostat housing.

1

Water Pump Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Use proper torque sequence to ensure even pressure on gasket.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Ensure pulley is seated correctly before tightening bolts.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage thermostat housing.

Accessory Drive

Specifications for securing the accessory drive belt tensioner.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure tensioner is properly aligned before tightening bolt.

Lubrication System

Specifications for securing the oil pump, oil filter housing, and oil drain plug.

1

Oil Pump Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Estimated value, use proper torque sequence.
2

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment before torquing.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new washer when reinstalling to prevent leaks

Engine Mounting

Specifications for securing the engine to the vehicle chassis.

1

Engine Mounting Bolts

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value, confirm based on specific engine mount.

Vanos System

Specifications for securing the VANOS solenoid valves.

1

VANOS Solenoid Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value, do not overtighten these bolts.

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 proper torque specifications important for my 4.4L BMW engine?

Using the correct torque specifications ensures even clamping force across mating surfaces, preventing leaks, gasket failure, and potential damage to components. Under-torquing can lead to leaks and loosening, while over-torquing can strip threads or distort parts, especially aluminum components common in the 4.4L engine. For example, over-torquing cylinder head bolts can lead to severe engine damage.

Q2

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

It's highly recommended, especially for critical components like cylinder head bolts and connecting rod bolts. These bolts are often 'torque-to-yield' (TTY) or 'stretch' bolts designed to stretch and clamp the parts together when tightened. Reusing these bolts can lead to inaccurate clamping force and increase risk of failure. Using new bolts each time ensures optimal performance and safety.

Q3

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

Generally, a light coat of clean engine oil is recommended on bolt threads and under the bolt head or washer. This reduces friction during tightening, leading to more accurate torque readings. Some bolts may require specific lubricants or thread sealant, and these requirements should be referenced in the appropriate repair manual. Avoid using excessive amounts of lubricant, which can affect the intended torque.

Q4

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

For most components, re-checking torque specifications after an initial drive or after running the engine for a short while is recommended. This is especially important for freshly installed components, such as cylinder heads or intake manifolds, as they may settle or compress slightly. Refer to the repair manual for specific recommendations. An example would be re-torquing cylinder head bolts after the initial heat cycle.

Q5

Where can I find the exact torque specifications for all components on the 4.4L engine?

The most reliable source for torque specifications is the official BMW repair manual for your specific model year. You can also find these specifications in reputable aftermarket repair databases or using subscription services that provide manufacturer-specific information. Always prioritize the official service manual and verify any third-party information for accuracy. Incorrect information may lead to serious engine issues. A reliable online database is the Bentley manual.

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 inch drive)

A calibrated torque wrench is essential for accurate bolt tightening. 1/2 inch drive is suitable for most engine fasteners.

  • Wide torque range (e.g., 20-200 Nm)
  • Click-type mechanism
  • Accuracy within +/- 3%
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench is needed for smaller bolts, often found in accessory components.

  • Lower torque range (e.g., 5-80 Nm)
  • Click-type mechanism
  • Accuracy within +/- 3%
Learn more

Socket Set (Metric)

A comprehensive socket set with various metric sizes is needed to fit all bolts.

  • 6-point sockets
  • Deep and shallow sockets
  • Various sizes (e.g., 8mm - 24mm)
Learn more

Socket Extensions

Extensions allow for easier access to bolts in tight spaces.

  • Various lengths
  • 1/2 inch and 3/8 inch drive sizes
Learn more

Universal Joint

A universal joint allows for offset torque application.

  • 1/2 inch and 3/8 inch drive sizes
  • Strong construction
Learn more

Thread Chaser Set (Metric)

Used to clean threads before installation.

  • Various Metric sizes
  • High quality steel
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure (M62TU 4.4L)

Proper tightening of cylinder head bolts is crucial for sealing and engine integrity. The procedure is multi-stage, using torque and angle.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install new cylinder head bolts.
  • 3. Tighten all bolts in the specified sequence to 40 Nm.
  • 4. Tighten all bolts in the specified sequence an additional 70 degrees.
  • 5. Tighten all bolts in the specified sequence an additional 90 degrees.
View full procedure

Intake Manifold Bolt Tightening Procedure

The intake manifold bolts must be tightened to the correct torque to prevent leaks. The bolts are tightened in a criss-cross pattern.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install all intake manifold bolts.
  • 3. Tighten all bolts in a criss-cross pattern to 10 Nm.
  • 4. Tighten all bolts in a criss-cross pattern to 22 Nm.
View full procedure

Connecting Rod Bolt Tightening Procedure

Connecting rod bolts are tightened to a torque specification and then a specific angle.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install all connecting rod bolts.
  • 3. Tighten all bolts to 20 Nm.
  • 4. Tighten all bolts an additional 70 degrees.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

Main bearing cap bolts are tightened in multiple stages.

  • 1. Clean all bolt threads and mating surfaces.
  • 2. Install all main bearing cap bolts.
  • 3. Tighten all bolts to 20 Nm.
  • 4. Tighten all bolts an additional 50 degrees.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Loosening

2005-03-15

Some early production 4.4L engines may experience cylinder head bolt loosening, especially those exposed to high operating temperatures. This can lead to head gasket failure and coolant leaks.

2002-2003

Resolution: Replace cylinder head bolts and torque to updated specifications (as outlined in service procedure).

Intake Manifold Gasket Leaks

2006-09-20

Reports of intake manifold leaks around the gaskets. Check for proper torque on manifold bolts.

2002-2006

Resolution: Inspect gaskets for damage. Replace as necessary and retorque bolts to specified torque

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