BMW 330i 2019-present 2.0L Engine Bolt Torque Specifications & Fastener Values
BMW 330i 2019-present

BMW 330i 2019-present 2.0L Engine Bolt Torque Specifications

Comprehensive guide to torque specifications for all major bolts on the 2.0 liter engine in the 2019-present BMW 330i. Includes cylinder head bolts, main bearing cap bolts, connecting rod 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

Specifications for bolts securing the cylinder head to the engine block. Proper torque is critical for maintaining a proper seal, preventing leaks, and ensuring proper compression.

1

Cylinder Head Bolts

M10 x 1.25
Important Notes
Always follow the specific tightening sequence outlined in the service manual. New bolts are typically required. Torque to the specified value, then turn an additional 90 degrees, then another 90 degrees. This is an estimated angle value, always check the specific manual.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Important Notes
Tighten to specified torque, then turn an additional 90 degrees. Always check the specific manual for the correct sequence.

Crankshaft And Rotating Assembly

Specifications for bolts related to the crankshaft, connecting rods, and flywheel. Precise torque is crucial for smooth engine operation and preventing bearing damage.

1

Main Bearing Bolts

M10 x 1.5
Important Notes
Tighten to the specified torque then turn the additional 70 degrees. Always follow the specific tightening sequence outlined in the service manual. This is an estimated angle value, always check the specific manual.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Tighten to the specified torque then turn the additional 50 degrees. Always follow the specific tightening sequence outlined in the service manual. This is an estimated angle value, always check the specific manual.
3

Flywheel Bolts

M12 x 1.5
Torque Value
67 ft-lbs (91 N·m)
Important Notes
Apply thread locker before installing. Torque bolts in a star pattern.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Apply thread locker before installing. Use a suitable holder for the harmonic balancer to prevent crankshaft rotation while tightening.

Oil System

Specifications for bolts related to the oil pan, oil pump, and filter housing. Proper torque is essential for leak-free operation.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Use a new gasket or sealant as specified in the manual. Torque evenly in a crisscross pattern.
2

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand-tighten only, do not over-tighten. Ensure the O-ring is correctly positioned and in good condition.
3

Oil Filter Housing Bolts

M6 x 1.0
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand-tighten only, do not over-tighten. Ensure the seal is correctly positioned and in good condition.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Always use a new crush washer. Over-tightening can damage the oil pan.

Valvetrain

Specifications for bolts related to the valve cover, rocker arms, camshafts and timing mechanisms. Correct torque ensures accurate valve operation.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque evenly in a crisscross pattern. Do not over-tighten as this can damage the cover or gasket.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the tensioner is correctly positioned for proper operation.
3

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
63 ft-lbs (85 N·m)
Important Notes
Ensure camshaft timing is set before torquing to specifications. Apply thread locker.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten rocker arm bolts evenly to prevent binding.
5

Variable Valve Timing (VANOS) Solenoid Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the solenoids are correctly oriented.

Intake And Exhaust

Specifications for bolts securing the intake manifold, exhaust manifold, throttle body, and EGR valve. Proper torque ensures leak-free operation.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque evenly in a crisscross pattern to avoid warping or leaks.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new gasket. Tighten evenly in a crisscross pattern to ensure a leak free seal.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten, as this can damage the throttle body.
4

EGR Valve Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the EGR valve gasket is correctly positioned.

Fuel System

Specifications for bolts securing the fuel rail and injectors. Correct torque is critical for leak prevention.

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
Ensure the fuel injectors are properly seated.

Ignition System

Specifications for bolts securing the spark plugs and ignition coils. Correct torque ensures proper combustion and performance.

1

Spark Plugs

M14 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a spark plug socket. Do not over-tighten.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Do not over-tighten, as this can damage the coils.

Cooling System

Specifications for bolts related to the water pump and thermostat housing. Correct torque ensures a leak-free system.

1

Water Pump Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Use a new gasket. Tighten bolts evenly in a crisscross pattern.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the pulley is correctly aligned.
3

Thermostat Housing Bolts

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

Coolant Temperature Sensor Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand-tighten only. Do not over-tighten, as this can damage the sensor.

Accessory Drive

Specifications for bolts securing components like the drive belt tensioner and idler pulleys.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the tensioner is correctly positioned.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the pulley rotates freely after tightening.

Engine Sensors

Specifications for bolts securing engine sensors. Correct torque ensures accurate readings and proper engine operation.

1

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is correctly positioned against the engine block.
2

Crank Position Sensor Mounting Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the sensor is properly aligned.
3

Oil Pressure Sensor Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
If sensor is threaded, use hand-tight only. Otherwise, use the specified torque value. Be careful not to overtighten, as this can damage the sensor.

Engine Mounting

Specifications for bolts securing the engine to its mounts. Correct torque is necessary to keep the engine stable.

1

Engine Mount Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use a new bolt if necessary. Check mounting for correct alignment before tightening.

Ancillary Components

Specifications for bolts securing components such as the starter and alternator that are attached to the engine.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Check starter alignment before tightening.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Check alternator alignment 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

What happens if I overtighten a bolt?

Overtightening can stretch or break bolts, damage threads in the engine block or components, and lead to leaks or component failure. For example, overtightening cylinder head bolts can cause head gasket failure and coolant leaks. Always use a calibrated torque wrench and adhere to the specified torque.

Q2

Why are torque specifications important?

Correct torque ensures that components are securely fastened without being stressed or damaged. Applying too little torque can lead to parts loosening over time, potentially causing major failures. Too much torque can damage threads, bolts, or even the engine block. Using correct torque is vital for the engine's integrity and safe operation.

Q3

Do I need to replace bolts after removing them?

In some cases, yes. Bolts that are designed to stretch upon tightening, such as cylinder head bolts and connecting rod bolts (often torque-to-yield bolts), should be replaced after removal. These bolts deform during the initial tightening, and reusing them may not achieve the correct clamping force. Refer to the repair manual for specific bolt replacement guidelines for your vehicle.

Q4

What is the difference between Nm and lb-ft torque specifications?

Nm (Newton-meters) and lb-ft (pound-feet) are units of torque. Nm is the metric standard used in many parts of the world, while lb-ft is common in the United States. Ensure your torque wrench matches the units specified in the repair manual. 1 lb-ft is approximately equal to 1.356 Nm. Always double-check your unit settings on your torque wrench to ensure you are applying the proper amount of torque to the given bolt.

Q5

How do I properly use a torque wrench?

1. Set the torque wrench to the correct specification. 2. Place the socket onto the bolt head. 3. Tighten the bolt smoothly until the torque wrench clicks or beeps (depending on the type). 4. Do not continue to pull on the wrench after it has clicked. 5. If multiple passes are required for a bolt, apply torque incrementally, following the specific tightening sequence in the repair manual.

Q6

What does it mean when a torque spec says "+90 degrees"?

This indicates an 'angle' torque specification. After initially tightening the bolt to a specified torque value, it must be further tightened by an additional number of degrees. This is used on some bolts that use a torque-to-yield design and this is typically indicated by a degree disc to give the tightening process more accuracy.

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 1/2" drive torque wrench is essential for applying the correct torque specifications to various engine bolts.

  • Wide torque range to cover different bolt sizes
  • Precise torque application
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is useful for smaller fasteners with lower torque requirements.

  • Smaller size for tighter access areas
  • Precise torque application
  • Durable construction
Learn more

Socket Set (Metric)

A comprehensive metric socket set is necessary to fit the different bolt heads on the engine.

  • Various sizes for different bolts
  • Durable construction
  • Chrome or similar finish for corrosion resistance
Learn more

Socket Extensions

Socket extensions provide reach for difficult-to-access bolts.

  • Different lengths for various access needs
  • Durable construction
Learn more

Torx Socket Set

A Torx socket set is necessary to fit the torx bolt heads on the engine

  • Various torx sizes for different bolts
  • Durable construction
Learn more

Angle Meter/Digital Torque Adapter

An angle meter or a digital torque adapter helps in tightening bolts using a torque-angle method.

  • Precise angle measurement
  • Digital display for accuracy
  • Attachment for existing torque wrench
Learn more
Service Procedures

Cylinder Head Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the cylinder head bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 20 Nm in the correct sequence.
  • 3. Tighten all bolts in the correct sequence an additional 90 Degrees
  • 4. Tighten all bolts in the correct sequence an additional 90 Degrees
  • 5. Verify all bolts are at the final spec
View full procedure

Crankshaft Main Bearing Cap Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the crankshaft main bearing cap bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 20 Nm in the correct sequence.
  • 3. Tighten all bolts in the correct sequence an additional 50 Degrees
  • 4. Tighten all bolts in the correct sequence an additional 50 Degrees
  • 5. Verify all bolts are at the final spec
View full procedure

Connecting Rod Cap Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the connecting rod cap bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 20 Nm in the correct sequence.
  • 3. Tighten all bolts in the correct sequence an additional 70 Degrees
  • 4. Verify all bolts are at the final spec
View full procedure

Oil Pan Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the oil pan bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 10 Nm in the correct sequence.
  • 3. Verify all bolts are at the final spec
View full procedure

Intake Manifold Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the Intake manifold bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 10 Nm in the correct sequence.
  • 3. Verify all bolts are at the final spec
View full procedure

Exhaust Manifold Bolt Tightening

This procedure outlines the correct tightening sequence and torque specifications for the exhaust manifold bolts on the 2.0L engine.

  • 1. Ensure all bolts are clean and lightly oiled.
  • 2. Tighten all bolts to 23 Nm in the correct sequence.
  • 3. Verify all bolts are at the final spec
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-Use Procedure

2021-05-15

This bulletin clarifies BMW's policy on cylinder head bolt re-use on the 2.0L engine and addresses concerns regarding potential bolt stretch.

2019-2021 BMW 330i (G20) with 2.0L engine

Resolution: Always replace cylinder head bolts when removing the cylinder head. Re-use is not recommended due to potential bolt stretch and reliability issues

Updated Torque Spec for Oil Pan Bolts

2022-03-10

This bulletin announces an updated torque specification for the oil pan bolts on the 2.0L engine due to recurring leaks.

2019-2022 BMW 330i (G20) with 2.0L engine

Resolution: Tighten all oil pan bolts to 10 Nm in the specified sequence.

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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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