BMW 840i 2018-present 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW 840i 2018-present

BMW 840i 2018-present 3.0L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 3.0L engine found in the 2018-Present BMW 840i (G14, G15, G16) models. Includes cylinder head, main bearing cap, connecting rod, and other critical fastener torque values.

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. Proper torque is crucial for combustion sealing and preventing head gasket failure.

1

Cylinder Head Bolts (Initial Torque)

M12 x 1.75
Important Notes
Torque bolts in the proper sequence. Use new bolts. Angle torque after initial torque.

Crankshaft And Bottom End

Specifications for securing the crankshaft, connecting rods, and related components. Correct torque ensures smooth engine operation and prevents bearing failure.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Tighten main bearing bolts in the proper sequence. Proper torque is crucial for oil clearance and crankshaft stability.
2

Connecting Rod Nuts

M8 x 1.25
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Tighten in a cross pattern to ensure even pressure.
3

Flywheel Bolts

M12 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Tighten flywheel bolts in a star pattern to ensure even pressure distribution.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Use a new bolt. Proper torque is critical for secure pulley attachment.

Oil System

Specifications for securing the oil pan, oil filter components, and other related parts. Proper torque prevents oil leaks.

1

Oil Pan Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten oil pan bolts in a cross-pattern sequence to ensure an even seal.
2

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand Tighten. Do not over tighten, as this may cause damage to the oil filter cap and housing, and cause leaks.
3

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand Tighten. Do not over tighten, as this may cause damage to the oil filter cap and housing, and cause leaks.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new washer. Do not over-tighten to prevent stripping of the threads.

Valvetrain

Specifications for securing valve covers, camshafts, rocker arms, and related components. Proper torque ensures accurate valve operation and prevents oil leaks.

1

Valve Cover Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten valve cover bolts in a cross-pattern sequence to ensure even pressure.
2

Camshaft Bearing Cap Bolts (Initial Torque)

M8 x 1.25
Important Notes
Tighten the camshaft bearing caps evenly in sequence, followed by an angle torque step. Proper clamping force is critical to camshaft function and avoiding damage.
3

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
63 ft-lbs (85 N·m)
Important Notes
Ensure proper camshaft timing before tightening.
4

Rocker Arms/Shafts Bolts

M6 x 1
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly in sequence
5

Variable Valve Timing (VVT) Actuator Bolts

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

Timing System

Specifications for securing timing belt/chain tensioner. Proper torque maintains proper tension on the belt or chain, which is crucial for proper valve timing.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Proper torque maintains timing accuracy. Ensure proper timing before tightening.

Intake And Exhaust

Specifications for securing intake manifolds, exhaust manifolds, throttle bodies, and EGR valves. Proper torque prevents leaks and maintains optimal engine performance.

1

Intake Manifold Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten intake manifold bolts in a cross-pattern sequence to ensure an even seal.
2

Intake Manifold Support Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten support bracket evenly
3

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten exhaust manifold bolts in a cross pattern to ensure even pressure. Use new gaskets.
4

Throttle Body Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten throttle body bolts evenly.
5

EGR Valve Bolts

M6 x 1
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly.

Fuel System

Specifications for securing fuel rails and fuel injectors. Proper torque ensures proper fuel pressure delivery and prevents fuel leaks.

1

Fuel Rail Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten fuel rail bolts evenly to ensure proper sealing and fuel pressure.
2

Fuel Injector Bolts

M5 x 0.8
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten fuel injector bolts evenly to ensure a proper seal. Do not overtighten.

Ignition System

Specifications for securing spark plugs and ignition coils. Proper torque ensures proper sealing and electrical connection.

1

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque is important to ensure proper combustion sealing and electrical contact. Use new plugs.
2

Ignition Coil Bolt

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten the ignition coil bolts to ensure they are properly secured and grounded.

Cooling System

Specifications for securing the water pump, thermostat housing, and related components. Proper torque prevents coolant leaks.

1

Water Pump Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten water pump bolts in a cross-pattern sequence to ensure even sealing and prevent leaks.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly.
3

Thermostat Housing Bolts

M6 x 1
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten thermostat housing bolts in a cross-pattern sequence to ensure proper sealing.
4

Engine Coolant Drain Plug Bolt

M12 x 1.5
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Use a new washer. Do not over-tighten to prevent stripping of the threads.

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 the BMW 3.0L engine?

Correct torque ensures components are securely fastened without over-tightening, which can damage threads, gaskets, or the components themselves. Under-tightening can lead to leaks, vibrations, and component failure. For instance, improperly torqued cylinder head bolts can lead to head gasket failure and severe engine damage.

Q2

Where can I find the most accurate torque specifications for my 2018-Present BMW 840i 3.0L engine?

The most accurate torque specifications are located in the official BMW repair manual or through a reputable automotive repair database like ALLDATA or Identifix. Always double-check the source and ensure the specs are specific to your vehicle’s model year and engine configuration. Third-party sources may be incorrect.

Q3

What is the typical sequence for torquing cylinder head bolts on this engine?

The cylinder head bolts on the 3.0L engine generally require a specific tightening sequence and multiple passes. A common sequence is to start from the center bolts and move outwards in a spiral pattern, using the initial torque, then following up with an angle tightening procedure (using a torque angle gauge). The exact procedure should be followed as outlined in the official BMW repair manual.

Q4

Do torque specifications change if I use different bolt materials (e.g., ARP studs)?

Yes, torque specifications can change if you use different bolt materials, especially for components like head bolts or connecting rod bolts. ARP or other aftermarket fasteners will have their specific torque requirements. Never assume the factory specifications are correct for these replacement components; refer to the manufacturer's specific instructions for correct torque values.

Q5

Should I use new bolts when reassembling components on the 3.0L engine, especially aluminum components?

Yes, many bolts on modern BMW engines, particularly those going into aluminum components or those that undergo 'torque-to-yield' procedures, are designed for single use. They stretch upon torquing. Reusing these bolts can compromise clamping force and lead to part failure. Always replace single-use bolts as recommended in the BMW repair 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" Drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values.

  • Wide torque range (typically 10-150 ft-lbs)
  • Clearly marked scale
  • Audible click when torque is reached
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values. This smaller drive is useful for lower torque applications.

  • Torque range appropriate for smaller bolts
  • Clearly marked scale
  • Audible click when torque is reached
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary to fit the various bolt head sizes on the engine.

  • Standard depth sockets
  • Deep sockets for recessed bolts
  • Various sizes (typically 6mm-19mm)
Learn more

Extension Bars

Extension bars provide added reach to access recessed or difficult-to-reach bolts.

  • Various lengths for flexibility
  • Secure connection to sockets
  • Made with durable steel
Learn more

Universal Joint

A universal joint allows access to bolts that are at an angle.

  • Allows angular movement
  • Secure connection to sockets and extensions
  • Made with durable steel
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure (3.0L Engine)

This procedure outlines the steps for correctly tightening the cylinder head bolts on the 3.0L engine in the 2018-Present BMW 840i. Correct torque is crucial for proper sealing and engine performance.

  • Ensure the engine is cold.
  • Clean the threads of the cylinder head bolts and bolt holes.
  • Install all cylinder head bolts finger tight.
  • Tighten all cylinder head bolts in the sequence below to 40 Nm (30 ft-lbs)
  • Tighten all cylinder head bolts in the same sequence again to 70 Nm (50 ft-lbs)
  • Rotate each bolt an additional 90 degrees.
  • Rotate each bolt an additional 90 degrees.
  • Verify torque and angles.
  • Recheck torque after 20 minutes of heat-cycle
View full procedure

Oil Pan Bolt Tightening Procedure (3.0L Engine)

This procedure outlines the steps for correctly tightening the oil pan bolts on the 3.0L engine in the 2018-Present BMW 840i. Correct torque is crucial to prevent leaks.

  • Clean the mating surfaces of the oil pan and engine block.
  • Install the oil pan with new gasket.
  • Install the bolts finger tight.
  • Tighten all bolts in a cross pattern to 10 Nm (7 ft-lbs).
  • Tighten all bolts in the same cross pattern to 22 Nm (16 ft-lbs).
  • Verify torque of each bolt.
View full procedure

Intake Manifold Bolt Tightening Procedure (3.0L Engine)

This procedure outlines the steps for correctly tightening the intake manifold bolts on the 3.0L engine in the 2018-Present BMW 840i. Correct torque is crucial to ensure proper sealing and prevent vacuum leaks.

  • Clean the mating surfaces of the intake manifold and cylinder head.
  • Install the intake manifold with a new gasket.
  • Install all bolts finger tight.
  • Tighten all bolts in a cross pattern to 10 Nm (7 ft-lbs).
  • Verify torque of each bolt.
View full procedure

Camshaft Carrier Bolt Tightening Procedure (3.0L Engine)

This procedure outlines the steps for correctly tightening the camshaft carrier bolts on the 3.0L engine in the 2018-Present BMW 840i. Correct torque is crucial to ensure proper valve timing.

  • Clean the mating surfaces of the camshaft carrier and cylinder head.
  • Install the camshaft carrier.
  • Install all bolts finger tight.
  • Tighten all bolts in a sequence to 8 Nm (6 ft-lbs).
  • Rotate all bolts an additional 90 degrees.
  • Verify torque and angles.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Failure

2020-06-15

Some 3.0L engines have experienced premature cylinder head bolt failure due to improper torque application. This can lead to coolant leaks and engine damage.

2018-2019

Resolution: Inspect cylinder head bolts for signs of stretching or failure. Replace all cylinder head bolts with new, properly torqued bolts according to the specified tightening procedure.

Oil Pan Gasket Leaks

2021-02-28

Reports of oil leaks from the oil pan gasket due to improper tightening of oil pan bolts.

2018-2021

Resolution: Ensure oil pan surface is clean, install new gasket and tighten bolts to the specified procedure and torque specs. Recheck for leaks after a test drive.

Intake Manifold Vacuum Leaks

2022-09-01

Vacuum leaks from the intake manifold have been noted on some models. Proper tightening is crucial.

2018-2022

Resolution: Ensure intake manifold surface is clean, install new gasket and tighten bolts to the specified procedure and torque specs. Smoke test to confirm no leaks.

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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