BMW 850i 2018-present 4.4L Engine Bolt Torque Specifications & Fastener Values
BMW 850i 2018-present

BMW 850i 2018-present 4.4L Engine Bolt Torque Specifications

Comprehensive list of bolt torque specifications for the 4.4-liter engine found in the 2018-Present BMW 850i (G15 generation). Includes torque values for various 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 assembly.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Tighten bolts in a specified sequence. First torque to specified value, then turn to specified angle for each step.
2

Cylinder Head Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid damaging the valve cover gasket.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly to ensure correct rocker arm alignment.
5

Variable Valve Timing (VVT) Solenoid Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten the bolts carefully to avoid damaging the solenoid housing.
6

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure spark plugs are installed squarely to avoid cross-threading. Use anti-seize if necessary.

Engine Block

Torque specifications for components directly attached to the engine block.

1

Main Bearing Bolts

M14 x 1.5
Important Notes
Tighten main bearing bolts in specified sequence. First torque to specified value then tighten to specified angle.
2

Connecting Rod Nuts

M9 x 1.0
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure connecting rod cap is correctly positioned before tightening.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid warping the oil pan.
4

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque to spec to ensure proper sensor readings.
5

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten to avoid damaging sensor
6

Oil Pressure Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque to spec to ensure accurate readings.
7

Water Pump Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure proper sealing.
8

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Hand tight and snug.
9

Oil Drain Plug

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer for proper sealing.

Intake And Exhaust

Torque specifications for components of the intake and exhaust system.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure proper seal.
2

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even sealing. May require a specific sequence.
3

EGR Valve Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure proper sealing.
4

Throttle Body Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid leaks.
5

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure a proper coolant seal.

Fuel System

Torque specifications for components of the fuel system.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure fuel rail is seated properly before tightening.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Be careful not to over tighten and damage injector.
3

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent leaks.

Timing And Drive

Torque specifications for timing and accessory drive components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure tensioner is correctly positioned before tightening.
2

Camshaft Sprocket Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure camshaft sprocket is correctly aligned before tightening.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Use correct torque to avoid vibration issues. May require additional angle torque.
4

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure pulley runs true.
5

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure tensioner is properly aligned.
6

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure correct alignment for proper belt tracking.

Starter Alternator Ac

Torque specifications for starter, alternator and AC components.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure proper starter motor alignment.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Tighten evenly to ensure correct alignment.
3

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment to avoid vibrations.

Ignition

Torque specifications for ignition related components

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten to the specified torque for secure mounting.

Flywheel

Torque specification for the flywheel

1

Flywheel Bolts

M12 x 1.75
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Ensure correct bolt length and that the flywheel is flush against crankshaft flange.

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?

Correct torque is crucial for proper component function and preventing damage. Under-torquing can lead to leaks or loosening, while over-torquing can cause bolt failure, stripped threads, and component damage. For example, improper torque on cylinder head bolts can cause compression leaks or engine failure.

Q2

What happens if I don't have a torque wrench?

Using a torque wrench is highly recommended for precise tightening. While it is possible to get an approximate feel with experience, this is discouraged, especially for critical components like engine internals. Inaccurate tightening can lead to severe issues, as described above. Renting a torque wrench from an auto parts store is preferable to guessing.

Q3

Should I use new bolts when working on the engine?

For critical components, such as cylinder head bolts and connecting rod bolts, it's generally recommended to use new bolts. These bolts are often 'torque-to-yield' (TTY) and are designed for a single use. Reusing these bolts may lead to incorrect clamping force and potential engine failure. Always refer to the BMW service manual for specific bolt replacement guidelines.

Q4

Do torque specifications apply to dry or lubricated threads?

Torque specifications generally apply to dry threads, unless stated otherwise in the service manual. Applying lubricant to threads can reduce friction, leading to over-tightening if the torque value remains the same. Always double-check the service manual to see if a specific lubricant and revised torque setting is necessary for a particular bolt.

Q5

What is the difference between Nm and lb-ft?

Nm (Newton-meters) and lb-ft (pound-feet) are units of torque. Nm is the standard unit in the metric system, while lb-ft is the common unit in the imperial system. A torque wrench will commonly have both scales, so you can convert as needed. Use the BMW service manual to ensure you are using the correct spec and units of measurement.

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 for applying precise torque values to fasteners.

  • 1/2 inch drive for common bolt sizes
  • Digital or dial-type for accurate readings
  • Wide torque range (e.g., 10-200 Nm)
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench for applying precise torque values to smaller fasteners.

  • 3/8 inch drive for smaller bolt sizes
  • Digital or dial-type for accurate readings
  • Lower torque range (e.g., 5-50 Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit all common engine bolts.

  • Variety of sizes (e.g., 8mm - 19mm)
  • 6-point design for secure fit
  • Deep and shallow socket options
Learn more

Extension Bars

Extension bars of various lengths to reach recessed fasteners.

  • Various lengths (e.g. 3-inch, 6-inch, 10-inch)
  • Secure locking mechanisms
  • Durable construction
Learn more

Universal Joint

A universal joint allows access to fasteners at an angle.

  • Swivels freely
  • Durable construction
  • Various drive sizes (e.g. 1/2-inch, 3/8-inch)
Learn more

Bolt Angle Measuring Tool

A tool used to accurately measure the angle of rotation during torque-to-angle procedures.

  • Digital or analog measurement
  • Precise angle readings
  • Easy attachment to torque wrenches
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (4.4L N63 Engine)

Procedure for torquing cylinder head bolts on the 4.4L N63 engine. Requires torque and angle specifications.

  • Clean all bolt threads and mating surfaces.
  • Apply engine oil to the bolt threads and under the bolt heads.
  • Install new cylinder head bolts.
  • Tighten all cylinder head bolts in the specified sequence to 40 Nm.
  • Tighten all cylinder head bolts in the specified sequence to 90 Nm.
  • Loosen all cylinder head bolts 180 degrees.
  • Tighten all cylinder head bolts in the specified sequence to 25 Nm.
  • Tighten all cylinder head bolts in the specified sequence an additional 90 degrees.
  • Tighten all cylinder head bolts in the specified sequence an additional 90 degrees.
View full procedure

Main Bearing Cap Bolt Torque Procedure (4.4L N63 Engine)

Procedure for torquing main bearing cap bolts on the 4.4L N63 engine. Requires torque and angle specifications.

  • Clean all bolt threads and mating surfaces.
  • Apply engine oil to the bolt threads and under the bolt heads.
  • Install main bearing cap bolts.
  • Tighten all main bearing cap bolts to 20 Nm.
  • Tighten all main bearing cap bolts an additional 70 degrees.
  • Tighten all main bearing cap bolts an additional 70 degrees.
View full procedure

Connecting Rod Bolt Torque Procedure (4.4L N63 Engine)

Procedure for torquing connecting rod bolts on the 4.4L N63 engine. Requires torque and angle specifications.

  • Clean all bolt threads and mating surfaces.
  • Apply engine oil to the bolt threads and under the bolt heads.
  • Install connecting rod bolts.
  • Tighten all connecting rod bolts to 20 Nm.
  • Tighten all connecting rod bolts an additional 50 degrees.
  • Tighten all connecting rod bolts an additional 50 degrees.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Stretch Issues on N63 Engines

2020-07-15

Some 2018-2020 N63 engines may experience cylinder head bolt stretch leading to loss of torque and potential gasket failure.

2018-2020 BMW 850i (G15) 2018-2020 BMW 750i (G11) 2018-2020 BMW X5 M50i (G05)

Resolution: Inspect cylinder head bolts for signs of stretch or damage. Replace with updated torque-to-yield bolts and follow revised torque specification if required. Always replace head bolts.

Updated Torque Specification for Oil Pan Bolts

2021-03-10

A revised torque specification has been released for the oil pan bolts on the N63 engine to prevent oil leaks.

2018-2021 BMW 850i (G15) 2018-2021 BMW 750i (G11) 2018-2021 BMW X5 M50i (G05)

Resolution: Always replace oil pan bolts. Use 12 Nm + 70 degrees for oil pan bolts. Use proper gasket sealant.

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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