BMW 750i 2015-present 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW 750i 2015-present

BMW 750i 2015-present 4.4L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 4.4L V8 engine found in the 2015-Present BMW 750i (G11/G12) generation. Includes cylinder head, crankshaft, connecting rod, and other critical 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

Components related to the cylinder head and its sealing to the engine block.

1

Cylinder Head Bolts

M12 x 1.75
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten cylinder head bolts in sequence.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts evenly to prevent exhaust leaks.

Engine Block

Components directly attached to or part of the engine block.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Tighten main bearing bolts in sequence.
2

Oil Pump Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure oil pump is correctly aligned before tightening.
3

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment of starter motor before tightening.
4

Alternator Mounting Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure alternator is properly aligned before tightening.
5

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure A/C compressor is properly aligned before tightening.

Crankshaft

Components related to the crankshaft assembly.

1

Flywheel Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Tighten flywheel bolts in a star pattern.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment and use of a crankshaft locking tool if necessary.

Connecting Rods

Components related to the connecting rod assembly.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper connecting rod cap alignment and lubrication of nut threads.

Camshaft

Components related to camshaft and valvetrain operation.

1

Camshaft Bearing Cap Bolts

M8 x 1.25
Important Notes
Tighten bolts in specified sequence. Use new bolts if necessary.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure camshaft is properly positioned and locked.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper rocker arm alignment before tightening.

Timing System

Components related to the timing of the engine.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure timing belt/chain tensioner is properly positioned.

Lubrication System

Components related to the engine's lubrication system.

1

Oil Pan Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to avoid distortion and leaks.
2

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure new O-ring is in place.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Always use a new crush washer when tightening the oil drain plug.

Cooling System

Components related to the engine's cooling system.

1

Water Pump Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure new gasket is in place.
2

Water Pump Pulley Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly.
3

Thermostat Housing Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure new gasket is in place.
4

Engine Coolant Temperature Sensor Bolt

M6 x 1
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure the sensor has a sealing washer or sealant to prevent leaks.

Intake System

Components related to the engine's air intake system.

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 from the center out.
2

Throttle Body Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts evenly to ensure a good seal.
3

Intake Manifold Runner Control Valve Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of valve before tightening.

Fuel System

Components related to the engine's fuel delivery system.

1

Fuel Rail Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly to prevent fuel leaks.
2

Fuel Injector Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper injector seating.

Ignition System

Components related to the engine's ignition system.

1

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a torque wrench and ensure plugs are fully seated.
2

Ignition Coil Bolt

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of ignition coil.

Engine Sensors

Components related to engine sensors.

1

Crankshaft Position Sensor Bolt

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment and seating of the sensor.
2

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is properly seated.
3

Variable Valve Timing (VVT) Solenoid Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment and seating of VVT solenoid.

Valve Cover

Components related to the engine's valve cover.

1

Valve Cover Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure an even seal.

Egr System

Components related to the engine's EGR system.

1

EGR Valve Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper seating and alignment.

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 is using the correct torque specification crucial for my BMW 750i 4.4L engine?

Using the correct torque specification ensures that bolts are tightened to the manufacturer's intended clamping force. Under-torquing can lead to component failure, leaks, and vibrations. Over-torquing can damage the bolts, threads, and surrounding engine components, potentially resulting in costly repairs. For example, improperly torqued cylinder head bolts could lead to head gasket failure and major engine damage.

Q2

Where can I find the exact torque specifications for my 4.4L BMW engine components?

The most reliable source for torque specifications is the official BMW repair manual or a reputable online database that is specifically for BMW vehicles. These sources are regularly updated and provide accurate data specific to your model year and engine variant. Websites like Bentley Publishers or specific BMW forums are also good places to look but should be cross-referenced against the official documentation. Using a generic spec sheet for a 4.4l V8 may not be accurate for the specifics of the N63 engine in your 750i.

Q3

Do I need to use a specific type of lubricant on the bolts before torquing?

Yes, certain bolts, especially those in critical areas like the cylinder head or connecting rods, require specific lubricants (like engine oil or specific anti-seize compounds). The torque specifications provided by BMW often assume that bolts are lubricated with specified substance. Using the wrong lubricant or no lubricant at all can affect the clamping force and lead to over or under torquing. Always refer to the official repair manual for specific instructions on lubrication for each component.

Q4

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

It is highly recommended to use a calibrated torque wrench. A click-type torque wrench is suitable for most applications, providing an audible and tactile signal when the desired torque is reached. A digital torque wrench provides even greater precision but is not essential. Always use a torque wrench with a range appropriate for the torque value. If a torque value is 10 ft/lb, a wrench rated for 250 lb/ft is unlikely to give accurate results.

Q5

Are there specific torque sequences I need to follow when tightening multiple bolts on a component?

Yes, for many components, especially those that need even clamping pressure like the cylinder head or intake manifold, BMW specifies specific torque sequences (often a spiral or crisscross pattern) and multiple torque stages. Following these sequences ensures the component is seated evenly and prevents warping or leaks. Failing to follow the correct sequence could damage components and cause leaks.

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 for common bolt sizes
  • Wide torque range (typically 20-150 ft-lbs)
  • Audible click mechanism for accurate torque application
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for smaller bolts.

  • 3/8 inch drive for smaller bolt sizes
  • Lower torque range (typically 5-80 ft-lbs)
  • Audible click mechanism for accurate torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit all bolt heads on the engine.

  • Standard and deep sockets
  • Various sizes ranging from 8mm to 19mm and beyond
  • 6-point and 12-point sockets for different bolt types
Learn more

Extension Bars

Extension bars provide extra reach for bolts located in hard-to-access areas.

  • Various lengths (e.g., 3 inch, 6 inch, 10 inch)
  • Strong construction to withstand high torque
  • 1/2 and 3/8 drive compatibility
Learn more

Universal Joint

A universal joint allows for torque application at an angle.

  • 1/2 and 3/8 inch drive options
  • Allows for angled torque application
  • Strong construction to withstand high torque
Learn more

Torque Angle Gauge

A torque angle gauge is required for fasteners that require tightening with torque and an angle.

  • Attaches to the torque wrench
  • Measures the angle of rotation
  • Accurate and easy to read
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Proper tightening of the cylinder head bolts is critical for a proper seal. Follow the specified torque sequence and angle specifications.

  • Apply a light coat of clean engine oil to the bolt threads and under the bolt heads.
  • Install the cylinder head and bolts by hand, tightening all bolts evenly until snug.
  • Tighten all bolts in the specified sequence to the first torque specification.
  • Tighten all bolts in the specified sequence to the second torque specification.
  • Using the torque angle gauge, tighten all bolts in the specified sequence to the specified angle.
View full procedure

Intake Manifold Bolt Tightening Procedure

The intake manifold bolts need to be tightened to the correct torque to avoid vacuum leaks. Follow the specified torque sequence.

  • Install the intake manifold and bolts by hand, tightening all bolts evenly until snug.
  • Tighten all bolts in the specified sequence to the specified torque specification.
  • Check for proper sealing and check torque values.
View full procedure

Connecting Rod Bolt Tightening Procedure

Correct connecting rod bolt torque is crucial for proper engine operation. Follow the specified torque sequence.

  • Apply a light coat of clean engine oil to the bolt threads and under the bolt heads.
  • Install the connecting rod cap and bolts by hand, tightening all bolts evenly until snug.
  • Tighten all bolts in the specified sequence to the first torque specification.
  • Using the torque angle gauge, tighten all bolts in the specified sequence to the specified angle.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

Correct main bearing cap bolt torque is crucial for proper engine operation. Follow the specified torque sequence.

  • Apply a light coat of clean engine oil to the bolt threads and under the bolt heads.
  • Install the main bearing cap and bolts by hand, tightening all bolts evenly until snug.
  • Tighten all bolts in the specified sequence to the first torque specification.
  • Using the torque angle gauge, tighten all bolts in the specified sequence to the specified angle.
View full procedure
Technical Service Bulletins

Engine Misfire Due to Improper Cylinder Head Bolt Torque

2017-05-15

Some instances of engine misfire have been traced back to incorrect cylinder head bolt torque application. Verify that the bolts have been tightened to the proper specifications and sequence.

2015-2017 BMW 750i

Resolution: Retorque the cylinder head bolts using the correct sequence and torque specifications. Always use a calibrated torque wrench and new bolts when possible.

Oil Leakage from Valve Cover Due to Improper Torque

2018-11-20

Oil leaks around the valve cover gasket can result from incorrect valve cover bolt tightening. Follow specified torque values and sequence to prevent leaks.

2015-2018 BMW 750i

Resolution: Replace the valve cover gasket if needed. Tighten the valve cover bolts using the correct torque specifications and sequence.

Engine Ticking Noise Due to Loose Connecting Rod Bolts

2020-08-01

A ticking noise from the engine area can sometimes be related to connecting rod bolts being under torqued. Check torques immediately if a noise is present.

2018-2020 BMW 750i

Resolution: Verify proper connecting rod bolt torque by following torque specifications. If bolts are loose or stretched, replace them.

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
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