BMW M2 2016-2021 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW M2 2016-2021

BMW M2 2016-2021 3.0L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for the 3.0L engine bolts in the 2016-2021 BMW M2 (F87). Includes critical fastener torques for engine assembly and maintenance.

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 for securing the head to the block, camshaft components, and other valvetrain elements.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Cylinder head bolts are torque-to-yield. Always replace bolts after removal. Follow a specific tightening sequence, usually starting from the center and working outwards. Torque values given are initial followed by two 90 degree angle steps. Always use new bolts.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in the proper sequence, ensuring even pressure across the camshaft journals.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure proper rocker arm function.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure on the valve cover gasket and prevent leaks.

Crankshaft And Rotating Assembly

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

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Main bearing bolts are torque-to-yield and should be replaced. Tighten in the correct sequence, working from the center outwards. Torque values given are initial followed by two 70 degree angle steps.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Connecting rod nuts may be torque-to-yield, and should be replaced if the manufacturer recommends. The torque value given is the initial torque, followed by a 70 degree angle step. Ensure correct orientation of the connecting rod cap.
3

Flywheel Bolts

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

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
110 ft-lbs (149 N·m)
Important Notes
Ensure the crankshaft pulley/harmonic balancer is properly seated before tightening. A higher torque is often needed.

Engine Block

Torque specifications for components mounted directly to the engine block, including oil pan, oil pump, and other sensors.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure an even seal. Be careful not to overtighten to avoid damage to the oil pan or gasket.
2

Oil Pump Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure proper alignment of the oil pump during installation. Tighten bolts evenly.
3

Oil Filter Housing Bolt

M22 x 1.5
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Tighten the oil filter housing to a hand tight value, then torque.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer when installing the oil drain plug. Do not overtighten.
5

Engine Mount Bolts (to Block)

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Ensure that engine mounts are properly aligned before tightening.
6

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Do not overtighten to avoid damaging the knock sensor.

Timing System

Torque specifications for components related to the timing chain or belt, including the tensioner and camshaft sprockets.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure correct tensioner alignment and operation. Refer to the service manual for specific adjustment procedure.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
55 ft-lbs (74 N·m)
Important Notes
Hold the camshaft with the correct tool while tightening the sprocket bolt. Ensure proper timing alignment.
3

Timing Chain/Belt Guide Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure guides are properly aligned and tightened evenly
4

Variable Valve Timing (VANOS) Unit Bolts/Nuts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Refer to the service manual for specific torque values. Ensure proper VANOS unit operation.

Intake And Exhaust

Torque specifications for components related to the intake and exhaust systems, including manifolds, throttle body, and EGR valve.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten intake manifold bolts in a criss-cross pattern to prevent leaks. Ensure proper gasket alignment.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten exhaust manifold bolts in a sequence, starting from the center and working outwards. Use new gaskets and ensure proper alignment.
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/headers to cylinder head bolts in a sequence, starting from the center and working outwards.
4

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to prevent vacuum leaks. Ensure correct throttle body gasket alignment.
5

EGR Valve Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the EGR valve is properly seated and the gasket is aligned before tightening bolts to prevent exhaust leaks.

Fuel System

Torque specifications for components related to the fuel system, including fuel rail, fuel injectors, and related parts.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten fuel rail bolts evenly to avoid fuel leaks. Ensure correct fuel rail alignment.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Ensure injectors are properly seated before tightening bolts. Avoid overtightening, which could damage the injectors.

Cooling System

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

1

Water Pump Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten water pump bolts evenly to ensure a leak-free seal. Use new gasket and ensure proper alignment.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten water pump pulley bolts evenly. Ensure proper pulley alignment.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten thermostat housing bolts evenly to ensure a leak-free seal. Use new gasket and ensure proper alignment.
4

Coolant Temperature Sensor Bolt/Fitting

M12 x 1.5
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Ensure proper sensor seal and alignment before tightening.

Electrical System

Torque specifications for components related to the electrical system, including the starter, alternator, sensors, and ignition coils.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Tighten the starter motor bolts securely, ensuring proper alignment with the engine.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure the alternator is correctly aligned to the engine. Tighten bolts evenly.
3

Ignition Coil Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten ignition coil bolts securely, but be careful not to over-tighten as this can damage the coil housing.
4

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten the camshaft position sensor bolt, which may damage the sensor
5

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten the crankshaft position sensor bolt, which may damage the sensor
6

Oil Pressure Sensor/Switch Torque

M10 x 1.0
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Ensure proper sensor seal before tightening.

Accessories

Torque Specifications for Engine Accessory Mounts

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Tighten A/C compressor bolts evenly to ensure proper alignment and function.
2

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure the power steering pump is correctly aligned and tightened.
3

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper tensioner operation after tightening. See service manual for proper procedure.
4

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure the idler pulley is correctly aligned before tightening.

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 when working on my 3.0L BMW M2 engine?

Correct torque specifications are crucial to ensure proper clamping force and prevent damage or failure of engine components. Over-tightening can strip threads, crush gaskets, and distort parts, while under-tightening can lead to leaks, vibrations, and loosening. For example, improperly torqued cylinder head bolts can result in head gasket failure and significant engine damage.

Q2

What type of torque wrench should I use?

It is recommended to use a calibrated torque wrench, preferably a click-type or digital wrench, for accurate torque application. Always ensure the wrench is within its calibration range for the given torque value. For example, if a bolt requires 15 Nm, using a wrench with a minimum range of 20 Nm is not ideal, you need a wrench where 15 Nm is within its accuracy window.

Q3

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

Yes, in many cases, especially for critical components like cylinder head bolts and connecting rod bolts, using new bolts is crucial. These bolts are often 'torque-to-yield' and designed to stretch, making them unsuitable for reuse. Reusing such bolts can lead to unreliable clamping force and potential engine failure. For instance, reusing a stretch-bolt on your main bearings could lead to premature engine bearing failure.

Q4

Should I use a specific tightening pattern when bolting engine components?

Absolutely. Following the manufacturer's specified tightening pattern is crucial for even pressure distribution and proper sealing. Typically, this involves a sequence that tightens bolts in multiple passes, from the center outwards or in a spiral pattern. For example, cylinder head bolts often use a specific pattern to avoid warping the head during tightening, ensuring optimal sealing.

Q5

What does it mean when a specification says 'plus X degrees' after the torque value?

This indicates an angle torque procedure. After reaching the specified initial torque, the bolt is further tightened by a given angle. This method is common for achieving precise clamping force, especially on torque-to-yield bolts. For example, you may see a specification such as '30 Nm + 90 degrees' which means that you must first tighten the bolt to 30 Nm, then turn the bolt 90 degrees more to achieve final torque.

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 with a 1/2 inch drive is essential for accurately applying specified torque values to engine components.

  • Precise torque settings
  • Ratchet mechanism for ease of use
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench with a 3/8 inch drive is needed for smaller bolts where a larger drive is not feasible.

  • Precise torque settings
  • Smaller size for tighter spaces
Learn more

Socket Set (Metric)

A comprehensive metric socket set, including various sizes for different bolts found on the 3.0L engine.

  • Variety of socket sizes
  • Durable construction
Learn more

Extension Bars (1/2 inch and 3/8 inch)

Extension bars of various lengths help reach bolts in difficult to access locations.

  • Variable lengths to reach hard-to-reach bolts
  • Durable construction
Learn more

Universal Joint (1/2 inch and 3/8 inch)

A universal joint allows for the socket to be set at an angle to reach bolts in tight locations.

  • Flexible angle to allow offset work
  • Durable construction
Learn more

Threadlocker (Medium Strength)

Medium strength threadlocker is often recommended for specific engine bolts to prevent loosening due to vibration.

  • Prevents bolt loosening
  • Allows for disassembly when needed
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

The procedure for tightening cylinder head bolts in the correct sequence and torque stages.

  • Apply new cylinder head bolts.
  • Tighten all bolts in the correct sequence to the first stage torque specification.
  • Tighten all bolts again in the correct sequence to the second stage torque specification.
  • Angle tighten the bolts based on the factory specifications.
  • Note: Always refer to the service manual for the specific torque specs and tightening sequence.
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

The procedure for correctly tightening connecting rod cap bolts in order to avoid engine damage.

  • Apply new connecting rod bolts.
  • Tighten all bolts in the correct sequence to the first stage torque specification.
  • Tighten all bolts again in the correct sequence to the second stage torque specification.
  • Angle tighten the bolts based on the factory specifications.
  • Note: Always refer to the service manual for the specific torque specs and tightening sequence.
View full procedure

Oil Pan Bolt Tightening Procedure

Procedure for properly tightening all the oil pan bolts to avoid leaks.

  • Install new oil pan gasket.
  • Tighten all bolts in the correct sequence to the factory specifications.
  • Note: Always refer to the service manual for the specific torque specs and tightening sequence.
View full procedure

Intake Manifold Bolt Tightening Procedure

Procedure for properly tightening all the intake manifold bolts.

  • Install new intake manifold gasket.
  • Tighten all bolts in the correct sequence to the factory specifications.
  • Note: Always refer to the service manual for the specific torque specs and tightening sequence.
View full procedure

Exhaust Manifold Bolt Tightening Procedure

Procedure for properly tightening all the exhaust manifold bolts.

  • Install new exhaust manifold gasket.
  • Tighten all bolts in the correct sequence to the factory specifications.
  • Note: Always refer to the service manual for the specific torque specs and tightening sequence.
View full procedure
Technical Service Bulletins

Slight Oil Leakage From Oil Pan

2017-05-10

Some 2016-2017 M2 vehicles with the 3.0L engine may experience a slight oil leak from the oil pan gasket. This may be due to variations in bolt torque.

2016-2017

Resolution: Re-torque the oil pan bolts to the latest specification as specified in the service manual. Replace the gasket if damage is noted. It is highly recommended to use new bolts and gasket.

Cylinder Head Bolt Stretch

2019-12-15

A small number of 2018-2019 M2 vehicles may experience slight cylinder head bolt stretch. This can affect compression and potentially cause overheating. Proper tightening of the head bolts is very critical for proper sealing and performance.

2018-2019

Resolution: Replace all the cylinder head bolts and follow the latest torque specifications provided in the service manual. Use the specified torque angle and use new bolts only.

Updated Connecting Rod Bolt Specification

2020-03-22

Some 2019-2020 M2 vehicles may require the latest connecting rod torque specification due to some observed bolt failures. Use only new bolts and make sure to tighten to specification.

2019-2020

Resolution: Ensure that the latest connecting rod bolt torque specifications are being used and replace all the connecting rod bolts as specified in the service manual. Always use new bolts.

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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