BMW M8 2019-present 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW M8 2019-present

BMW M8 2019-present 4.4L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 4.4L V8 engine found in the 2019-Present BMW M8 (F91/F92/F93) models. Includes torque values for critical engine components.

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 related sensors.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Multi-step torque procedure is critical. The provided values are for the first torque step. Follow OEM procedure for final angle tightening.
2

Cylinder Head Cover Bolts/Nuts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Often aluminum or magnesium, torque carefully. Not to be confused with valve cover.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated before tightening.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper rocker arm/shaft alignment during installation.
5

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use anti-seize compound on spark plug threads if recommended by the manufacturer

Engine Block

Torque specifications for components attached directly to the engine block, including crankshaft, pistons, and oil systems.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Multi-step torque procedure with angle tightening. Use new bolts if specified. First torque step provided.
2

Connecting Rod Nuts

M9 x 1.0
Important Notes
Multi-step torque procedure including angle. The torque provided is for the first step. Use new nuts if specified.
3

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly aligned with the crankshaft
4

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque properly for accurate sensor function.
5

Oil Pump Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper oil pump alignment during installation.
6

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper gasket or o-ring seal during installation.
7

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new crush washer if specified. Do not overtighten.
8

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used.

Timing System

Torque specifications for components related to the timing system, including chain/belt tensioners, camshaft sprockets, and timing cover.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper tensioner alignment and operation.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper camshaft timing and sprocket seating.
3

Timing Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used when securing.

External Components

Torque specifications for external engine components, including intake/exhaust systems, throttle body, and related parts.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Value
120 ft-lbs (163 N·m)
Important Notes
Use proper tool to hold crankshaft stationary during tightening.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper throttle body alignment and gasket is in good condition.
3

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper gasket or sealant is used. Tighten in a crisscross pattern.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure proper gasket or sealant is used, tighten evenly.
5

EGR Valve Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper gasket or sealant is used.
6

Fuel Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure fuel rail is properly seated and aligned.
7

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper fuel injector alignment and seating.
8

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper alignment and seating.
9

Ignition Coil Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper coil seating and alignment.

Cooling System

Torque specifications for components related to the engine cooling system, including water pump, thermostat housing, and coolant sensors.

1

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure pulley is properly aligned on the water pump shaft.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper thermostat and gasket installation.
4

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated with a sealing washer if present.

Mounts

Torque specifications for engine mounts, which are critical for securing the engine to the chassis.

1

Engine Mount Bolts

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
May have rubber or hydraulic damping, ensure proper torque.

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 it crucial to use the correct torque specifications when working on the 4.4L BMW M8 engine?

Using the correct torque specifications ensures proper clamping force, preventing leaks, component failure, and potential engine damage. Under-torquing can lead to parts loosening over time, while over-torquing can stretch or break bolts, leading to thread damage and costly repairs. For example, improper torque on the cylinder head bolts can result in blown head gaskets or warped heads.

Q2

What type of torque wrench should I use for these specifications?

A calibrated torque wrench is essential. For many engine components, a 1/2 inch drive wrench is recommended for higher torque specifications, while a 3/8 inch drive wrench may be more appropriate for smaller bolts with lower torque values. Digital torque wrenches offer higher accuracy than mechanical ones, but either is acceptable if correctly calibrated. Avoid using impact wrenches for final tightening as it’s very easy to over tighten.

Q3

Do I need to replace bolts after they are removed, especially torque-to-yield bolts?

Yes, in many cases you do. Torque-to-yield (TTY) bolts, such as those commonly used on cylinder heads and connecting rods of the 4.4L engine, are designed to stretch when tightened to a specific torque and angle. These bolts must be replaced after they are loosened as they are no longer capable of maintaining the correct clamp force. Reusing them can result in catastrophic engine failure. Always refer to the BMW service manual for bolt replacement guidelines.

Q4

Where can I find the most accurate torque specifications for my specific 2019-Present BMW M8 4.4L engine?

The most accurate torque specifications are found in the official BMW repair manual (ISTA) for your vehicle model and year. Online forums and aftermarket resources may not always be accurate or up-to-date, and should only be used for general reference. Always confirm critical torque values in ISTA.

Q5

What are some common areas where I need to pay extra attention to torque specs on the 4.4L engine?

Critical areas that require precise torque application include the cylinder head bolts, connecting rod bolts, main bearing bolts, intake manifold bolts, exhaust manifold bolts, and VANOS system components. These areas are integral to the engine's performance and proper function. For instance, incorrect torque on the VANOS actuators can result in timing issues and performance loss.

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 high-quality torque wrench with a 1/2" drive is essential for accurately tightening bolts to the manufacturer's specifications.

  • Wide torque range
  • Accurate calibration
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is needed for smaller bolts that don't require as high of torque values.

  • Lower torque range
  • Fine adjustments
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive metric socket set is needed to fit all the various bolt heads on the engine.

  • Various sizes
  • Durable material
  • Deep sockets
Learn more

Socket Extensions

Extensions of different lengths are needed to reach recessed or difficult to access bolts.

  • Varying lengths
  • Durable material
  • Secure connection
Learn more

Flexible Head Socket Joint

A flexible socket joint allows you to access bolts that are at an angle or in tight spots.

  • Flexible pivoting head
  • Secure hold on sockets
  • Durable construction
Learn more

E-Torx Socket Set

E-Torx sockets are required for certain components on the BMW engine.

  • E-torx sizes
  • Durable material
  • Precise fit
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure (S63)

Procedure for properly tightening the cylinder head bolts on the 4.4L S63 engine, crucial for maintaining proper compression and preventing leaks.

  • Clean all bolt threads and mating surfaces.
  • Install cylinder head bolts in the correct sequence.
  • Tighten all bolts to the first torque specification (e.g., 20 Nm).
  • Tighten all bolts to the second torque specification (e.g., 70 Nm).
  • Angle tighten all bolts to the specified angle (e.g., 90 degrees).
  • Check final torque values.
View full procedure

Main Bearing Cap Bolt Tightening Procedure (S63)

Procedure for tightening the main bearing cap bolts on the 4.4L S63 engine, essential for crankshaft support and function.

  • Clean all bolt threads and mating surfaces.
  • Install main bearing cap bolts in the correct sequence.
  • Tighten all bolts to the first torque specification (e.g., 20 Nm).
  • Tighten all bolts to the second torque specification (e.g., 70 Nm).
  • Angle tighten all bolts to the specified angle (e.g., 75 degrees).
  • Check final torque values.
View full procedure

Connecting Rod Bolt Tightening Procedure (S63)

Procedure for tightening the connecting rod bolts on the 4.4L S63 engine, vital for proper piston movement and engine integrity.

  • Clean all bolt threads and mating surfaces.
  • Install connecting rod bolts in the correct sequence.
  • Tighten all bolts to the first torque specification (e.g., 20 Nm).
  • Tighten all bolts to the second torque specification (e.g., 50 Nm).
  • Angle tighten all bolts to the specified angle (e.g., 60 degrees).
  • Check final torque values.
View full procedure
Technical Service Bulletins

S63 Engine Oil Leak at Timing Chain Cover

2021-05-15

Some 2019-2021 S63 engines have experienced oil leaks at the timing chain cover due to improper torque of the bolts, leading to gasket failure.

2019-2021 BMW M8

Resolution: Inspect timing chain cover bolts, replace the gasket, and tighten bolts to the updated torque specifications (refer to bulletin document for specific values and sequence).

Updated Torque Specifications for S63 Main Bearing Bolts

2022-03-20

A service update has been issued with revised torque specifications for the main bearing bolts due to reports of bearing wear.

2019-2022 BMW M8

Resolution: Tighten main bearing bolts according to the updated specifications, which includes a revised angle tightening value, as detailed in the service bulletin (refer to bulletin document for specific values and sequence).

About the Author

Expert automotive knowledge and experience

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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