BMW 740i 2016-present 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW 740i 2016-present

BMW 740i 2016-present 3.0L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 3.0 liter engine in the 2016-Present BMW 740i (G11/G12) models. This includes specifications for cylinder head bolts, connecting rod bolts, main bearing 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 bolts securing the head to the block, and related components.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
These are torque-to-yield (TTY) bolts. Use new bolts. Follow specific BMW torque sequence. Initial torque value is an estimate, final angle torque is critical.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly in a crisscross pattern to ensure proper gasket seal.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Tighten evenly to ensure proper valve operation.
4

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten to ensure proper sensor function.
5

Variable Valve Timing (VANOS) Solenoid Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten to ensure proper solenoid function.

Engine Block

Torque specifications for components directly related to the engine block, including the crankshaft and oil system.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Use new bolts. Follow the specified torque sequence. Initial torque is an estimate, final angle torque is critical.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly in a crisscross pattern to ensure proper gasket seal.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Use a new washer for the oil drain plug.
4

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten evenly to prevent leaks.
5

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten to ensure proper sensor function.
6

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Check BMW service manual for exact specification.
7

Engine Mount Bolts

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Refer to specific BMW service manual for precise locations and torque values, value is estimated based on similar bolts.

Connecting Rods

Torque specifications for connecting rods and their associated components.

1

Connecting Rod Nuts

M9 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper bearing function.

Flywheel And Drivetrain

Torque specifications for components related to the flywheel, and crankshaft pulley.

1

Flywheel Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Use new bolts and follow a star pattern.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Hold crankshaft while tightening. May require special tool.

Timing System

Torque specifications for components related to the timing system, including chains and sprockets.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten to ensure proper chain tension.
2

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Hold the camshaft when tightening.
3

Timing Chain Guide/Rail Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Consult specific BMW service literature for precise locations and torques as there may be multiple.

Intake And Exhaust

Torque specifications for components related to the intake and exhaust systems.

1

Throttle Body Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Tighten evenly to ensure proper seal.
2

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly in a crisscross pattern to ensure proper seal.
3

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten evenly to prevent leaks.
4

EGR Valve Bolts

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

Fuel System

Torque specifications for components related to the fuel system.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Tighten evenly to ensure secure attachment.
2

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Tighten evenly to ensure secure attachment.
3

Fuel Injector Bolts

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten gently to avoid damaging the injectors.

Ignition System

Torque specifications for components related to the ignition system.

1

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a spark plug socket. Do not overtighten.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten to secure the ignition coil correctly.

Cooling System

Torque specifications for components related to the engine's cooling system.

1

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent leaks.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly to ensure proper pulley operation.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent leaks.
4

Oil Cooler Lines/Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Refer to specific BMW service manual for exact locations and torque values.

Accessory Drive

Torque specifications for components related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten to secure tensioner and maintain proper belt tension.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten to ensure smooth belt operation.

Oil System Misc

Torque specifications for other oil system components.

1

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only. Do not overtighten.

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 important to use the correct torque specifications?

Using the correct torque specifications ensures proper clamping force between components. Insufficient torque can lead to leaks, loosening, and potential part failure. Over-tightening can damage threads, warp components, and cause premature wear or breakage. For example, over-torquing a cylinder head bolt can cause head gasket failure, while under-torquing can result in coolant or oil leaks.

Q2

What type of torque wrench should I use?

A calibrated torque wrench is essential for accurately tightening bolts. For the 3.0L engine, a click-type or digital torque wrench capable of measuring torque within the required ranges (typically in Newton-meters or foot-pounds) is recommended. Avoid using beam-type torque wrenches, as they are less accurate. Make sure the wrench's calibration is current.

Q3

Do I need to use new bolts when reassembling engine components?

In many cases, yes. Especially for critical components like cylinder head bolts, BMW often uses torque-to-yield (TTY) bolts, which stretch upon tightening and must be replaced. Reusing these bolts can lead to inaccurate torque and potential engine damage. Always refer to the BMW repair manual for specific component replacement recommendations. For example, connecting rod bolts on this engine are typically TTY and need to be replaced each time.

Q4

Should I lubricate the bolt threads before tightening?

Some bolts require lubrication on the threads and under the bolt head, while others should be tightened dry. Applying lubricant where not specified will alter the clamping force achieved at a given torque setting, potentially leading to over- or under-tightening. Always refer to the BMW service manual for specific lubrication requirements for each fastener.

Q5

How do I deal with torque angle requirements?

Certain bolts, especially cylinder head bolts and connecting rod bolts, require torque to yield tightening procedures involving an initial torque value followed by a specified angle of rotation. An angle gauge or an angle-measuring torque wrench is required for these procedures. The angle ensures correct bolt stretch and clamping force. Failing to achieve this angle will lead to improperly torqued bolts which could fail in the real world.

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 with a 1/2" drive is essential for accurately tightening bolts to the specified torque values. A range of 10-250 Nm (or equivalent in ft-lbs) is recommended.

  • Wide torque range
  • Audible click indicating desired torque achieved
  • Accuracy within +/- 3%
Learn more

Torque Wrench (3/8" Drive)

A smaller calibrated torque wrench with a 3/8" drive is needed for smaller bolts and fasteners that require lower torque settings. A range of 5-100 Nm (or equivalent in ft-lbs) is recommended.

  • Suitable for lower torque applications
  • Smaller and easier to handle in confined spaces
  • Accuracy within +/- 3%
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including deep sockets, in sizes ranging from 8mm to 24mm is necessary to fit various bolt heads on the 3.0L engine.

  • Variety of sizes
  • 6-point sockets for better grip
  • Durable construction
Learn more

Extension Bars

Various length extension bars are needed to reach bolts located in recessed areas or where access is restricted.

  • Various lengths available
  • Secure locking mechanism
  • Durable construction
Learn more

Universal Joint

A universal joint allows the torque wrench to access bolts at an angle, which is often required in tight engine bays.

  • Flexible angle adjustment
  • Robust design
  • Smooth operation
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the specific steps and torque specifications for tightening the cylinder head bolts on the 3.0L engine.

  • Ensure all cylinder head bolt threads are clean and lightly lubricated with new engine oil.
  • Install all cylinder head bolts by hand, turning them until they just touch the head.
  • Using the torque wrench and the specified pattern, tighten all bolts to Stage 1 torque (e.g. 40 Nm)
  • Tighten all bolts to Stage 2 torque (e.g. +90 degrees) in the same pattern.
  • Tighten all bolts to Stage 3 torque (e.g. +90 degrees) in the same pattern.
  • Verify all bolts are torqued correctly after final torque procedure.
  • Double check any specific requirements for the torque angle.
View full procedure

Oil Pan Bolt Tightening Procedure

This procedure outlines the specific steps and torque specifications for tightening the oil pan bolts on the 3.0L engine.

  • Ensure the oil pan mating surfaces are clean and free of debris.
  • Install the oil pan with a new gasket, and all bolts by hand, turning them until they just touch.
  • Tighten all bolts to 10 Nm starting from the inside and working to the outside in a criss cross pattern.
  • Tighten all bolts to final torque of 22 Nm in the same pattern
  • Verify all bolts are torqued correctly
View full procedure

Intake Manifold Bolt Tightening Procedure

This procedure outlines the specific steps and torque specifications for tightening the intake manifold bolts on the 3.0L engine.

  • Ensure the intake manifold mating surfaces are clean and free of debris.
  • Install the intake manifold and all bolts by hand, turning them until they just touch.
  • Tighten all bolts to 10 Nm in a criss cross pattern
  • Tighten all bolts to final torque of 20 Nm in the same pattern
  • Verify all bolts are torqued correctly
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-torque Procedure

2017-06-15

This bulletin addresses instances of cylinder head bolt loosening on early production 3.0L engines.

2016-2017

Resolution: Follow the revised cylinder head bolt tightening procedure which includes an additional re-torque procedure after initial run-in of engine. Replace all torque to yield bolts if loosening has occured.

Oil Pan Bolt Leakage Issue

2018-03-22

This bulletin highlights potential oil leakage issues from the oil pan due to improper bolt tightening and/or gasket failure.

2016-2018

Resolution: Ensure proper cleaning of mating surfaces, use a new gasket, and follow the specified oil pan bolt torque sequence and torque specifications when reinstalling the oil pan. Use specified torque and verify after short drive if leak is suspected.

Intake Manifold Bolt Failure

2020-01-10

This bulletin addresses issues of intake manifold bolt failure related to over torqueing.

2016-2020

Resolution: Ensure you are using a calibrated torque wrench, use the correct tightening sequence, and use specified torque values. Replace all torque to yield bolts if any are stretched.

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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