BMW 428i 2014-2016 2.0L Engine Bolt Torque Specifications & Fastener Values
BMW 428i 2014-2016

BMW 428i 2014-2016 2.0L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 2.0-liter engine in the 2014-2016 BMW 428i, including cylinder head, main bearing, connecting rod, and other critical fasteners.

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 fasteners related to securing the cylinder head to the engine block.

1

Cylinder Head Bolts

M12 x 1.75
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts in specified sequence. Final tightening may require an angle step (not specified in given source, use with caution)

Engine Block

Specifications for fasteners related to the engine block, including main bearings, oil pan and harmonic balancer.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
77 ft-lbs (105 N·m)
Important Notes
Tighten bolts in specified sequence to ensure even clamping force.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts evenly to prevent leaks. Recommended to use a new gasket.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
77 ft-lbs (105 N·m)
Important Notes
Proper torque is critical for vibration damping and accessory drive.
4

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures sensor sensitivity. Estimated value based on typical knock sensor bolt size.

Connecting Rods

Specifications for fasteners related to the connecting rods and their attachment to the crankshaft.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure proper torque to prevent bearing and rod failure.

Flywheel

Specifications for fasteners related to attaching the flywheel or flexplate to the crankshaft.

1

Flywheel Bolts

M10 x 1.5
Torque Value
88 ft-lbs (120 N·m)
Important Notes
Use new bolts if specified by service manual. Ensure proper alignment with dowel pins if equipped.

Valvetrain

Specifications for fasteners related to components of the valvetrain.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts evenly to prevent oil leaks. Use a new valve cover gasket.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure correct rocker arm alignment. Tighten in a specified sequence (see service manual).
3

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
63 ft-lbs (85 N·m)
Important Notes
Ensure proper camshaft timing.

Timing System

Specifications for fasteners related to the timing system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper timing belt/chain tension.

Induction System

Specifications for fasteners related to components of the induction system.

1

Throttle Body Bolts

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

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in specified sequence to prevent air leaks. New gasket recommended.

Exhaust System

Specifications for fasteners related to exhaust manifold and EGR valve.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts evenly to prevent exhaust leaks. New gasket recommended.
2

EGR Valve Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure proper sealing to prevent exhaust leaks. New gasket recommended.

Fuel System

Specifications for fasteners related to the fuel system components.

1

Fuel Rail Bolts

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

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to ensure proper sealing. Do not overtighten.
3

Fuel Injector Rail Bolts

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

Ignition System

Specifications for fasteners related to ignition system components.

1

Spark Plugs

M14 x 1.25
Torque Value
23 ft-lbs (30 N·m)
Important Notes
Ensure plugs are properly seated and torqued. Do not overtighten.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten. Ensure correct alignment.

Cooling System

Specifications for fasteners related to cooling system components.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts evenly to prevent coolant leaks. Use a new gasket.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten bolts evenly to prevent slipping. Ensure proper alignment.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent coolant leaks. Use a new gasket.
4

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper sealing and electrical contact. Estimated value.

Accessory Drive

Specifications for fasteners related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper accessory belt tension. Do not overtighten.

Oil System

Specifications for fasteners related to oil system components.

1

Oil Filter Cap

N/A
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Tighten to hand tight (15-20 ft-lbs) to prevent leaks. Estimated value.
2

Oil Filter Housing Bolt

N/A
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Tighten to hand tight (15-20 ft-lbs) to prevent leaks. Estimated value.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Proper torque is necessary to prevent oil leaks and damage to oil pan threads.

Sensor System

Specifications for fasteners related to engine sensors.

1

Crank Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure correct alignment. Do not overtighten. Estimated value.
2

Cam Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper alignment. Do not overtighten. Estimated value.

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 using the correct torque specification so important?

Using the correct torque specification ensures proper clamping force between components. Over-tightening can lead to bolt failure, component damage, or distortion, potentially causing leaks or engine failure. Under-tightening can cause components to loosen, leading to vibrations, leaks, or catastrophic damage, especially in high-stress engine parts.

Q2

Do I need to replace bolts after removing them?

In many cases, especially with crucial components like cylinder head bolts, it's highly recommended to replace bolts, particularly those specified as 'torque-to-yield'. These bolts stretch slightly upon tightening and may not provide the same clamping force if reused, risking component damage and engine failure. For other bolts, visual inspection can help determine if they need replacement (check for stretching, damage, or corrosion).

Q3

What type of lubricant should be used on bolts?

The use of lubricant, such as engine oil or anti-seize compound, depends on the bolt specification. Always consult the manufacturer's service manual. Applying lubricant can alter the friction on the threads and, subsequently, the applied torque. Often, torque specifications are given for either dry threads or lubricated threads. Using lubricant when a dry torque spec is called for, or vice versa, can result in significant clamping force differences and potential problems.

Q4

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

While 'hand-tightening' might seem sufficient, it is never a reliable substitute for a torque wrench, especially for engine components. Using a torque wrench is crucial for accurate clamping force. Without it, you risk either under-tightening, leading to leaks, or over-tightening, risking bolt damage or component failure. Investing in a quality torque wrench, especially one that covers the torque range required for the 2.0L engine, is a must.

Q5

Can I re-use intake manifold gaskets?

It is generally recommended to replace intake manifold gaskets each time the intake manifold is removed. Old gaskets can become compressed and may not seal properly when reused, potentially leading to vacuum leaks which can affect engine performance and fuel efficiency.

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 inch drive is essential for accurately tightening bolts to specified torque values.

  • Wide torque range (suitable for engine components)
  • Click-type or digital readout
  • Accurate calibration
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench with a 3/8 inch drive is useful for smaller fasteners and components where a 1/2" drive is too large

  • Suitable for smaller fasteners
  • Click-type or digital readout
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit different bolt heads on the engine.

  • Various sizes (6-24 mm)
  • 6-point sockets for optimal grip
  • Durable construction
Learn more

Socket Extensions

Extensions of different lengths to reach bolts in recessed areas

  • Various lengths for accessibility
  • Durable construction
Learn more

Torx Socket Set

A set of torx bits and sockets to remove or install fasteners with torx heads

  • Various sizes of torx bits
  • Durable construction
Learn more

Angle Measuring Tool

An angle measuring tool or angle torque adapter to tighten fasteners to specic angles after reaching a specific torque value

  • Measures torque in degrees
  • Accurate and easy to read
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Detailed steps for tightening cylinder head bolts, including the correct sequence and torque specifications.

  • Clean cylinder head and block mating surfaces.
  • Install new cylinder head gasket.
  • Install cylinder head.
  • Apply engine oil to cylinder head bolt threads and under bolt heads.
  • Torque all cylinder head bolts to 30 Nm in the proper sequence.
  • Torque all cylinder head bolts to 90 degrees in the proper sequence.
  • Torque all cylinder head bolts to 90 degrees in the proper sequence.
View full procedure

Connecting Rod Bolt Tightening Procedure

Detailed steps for tightening connecting rod bolts, including the correct sequence and torque specifications.

  • Apply engine oil to connecting rod bolt threads and under bolt heads.
  • Torque all connecting rod bolts to 20 Nm.
  • Torque all connecting rod bolts to 70 degrees.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

Detailed steps for tightening main bearing cap bolts, including the correct sequence and torque specifications.

  • Apply engine oil to main bearing cap bolt threads and under bolt heads.
  • Torque all main bearing cap bolts to 20 Nm.
  • Torque all main bearing cap bolts to 80 degrees.
View full procedure

Valve Cover Bolt Tightening Procedure

Detailed steps for tightening valve cover bolts, including the correct sequence and torque specifications.

  • Clean valve cover and cylinder head mating surfaces.
  • Install new valve cover gasket.
  • Install valve cover.
  • Tighten valve cover bolts to 10Nm.
View full procedure
Technical Service Bulletins

N20 Engine Cylinder Head Bolt Re-Torque

2015-03-15

Some early production N20 engines may experience head gasket leaks or bolt stretch. This bulletin details re-torquing procedure.

2012-2015 BMW 428i with N20 Engine

Resolution: Follow the updated cylinder head bolt tightening procedure outlined in the service manual. Replace bolts if necessary.

Oil Leakage from Timing Cover Area

2016-01-20

Some vehicles may exhibit oil leaks from the timing cover. Verify torque specs are correct

2014-2016 BMW 428i with N20 Engine

Resolution: Ensure timing cover bolts are tightened to 10 Nm. Replace the timing cover gasket if leakage continues.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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