BMW 335i 2012-2018 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW 335i 2012-2018

BMW 335i 2012-2018 3.0L Engine Bolt Torque Specifications

Comprehensive list of bolt torque specifications for the 3.0L engine used in the 2012-2018 BMW 335i (F30/F32/F36) models. Includes torque values for various engine components, ensuring proper installation and preventing damage.

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 the cylinder head, including the head bolts and camshaft components.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Torque to 18 ft-lbs (24 N·m) then angle-tighten 90 degrees, then 90 degrees in the correct sequence. These are torque-to-yield bolts and must be replaced.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m) in sequence.
3

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Torque to 75 ft-lbs (102 N·m). Verify the correct tightening procedure as some engines may have a torque plus angle sequence.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
23 ft-lbs (31 N·m)
Important Notes
Torque to 23 ft-lbs (31 N·m).
5

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m) in sequence. Use new gasket.
6

Variable Valve Timing (VANOS) Unit Bolts

M8 x 1.25
Important Notes
Torque to 18 ft-lbs (24 N·m), then angle-tighten 60 degrees. Verify the exact torque procedure.

Engine Block

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

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Torque to 22 ft-lbs (30 N·m), then angle-tighten 70 degrees, then 50 degrees in sequence. These are torque-to-yield bolts and must be replaced.
2

Connecting Rod Nuts

M9 x 1.0
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m). Some models may have a torque plus angle tightening sequence.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m) in sequence. Use a new gasket.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Torque to 25 ft-lbs (34 N·m) using a new crush washer.
5

Oil Filter Housing Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m).
6

Knock Sensor Bolt

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

Rotating Assembly

Specifications for fasteners related to the rotating assembly, including the flywheel and crankshaft pulley.

1

Flywheel Bolts

M12 x 1.5
Torque Value
63 ft-lbs (85 N·m)
Important Notes
Torque to 63 ft-lbs (85 N·m). Use new bolts.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Important Notes
Torque to 75 ft-lbs (102 N·m) then angle-tighten 60 degrees. Use a new bolt.

Intake System

Specifications for fasteners related to the intake system, including the throttle body and intake manifold.

1

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque to 7 ft-lbs (10 N·m). Use new gasket.
2

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m) in sequence. Use new gaskets.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m). Use new gasket.

Exhaust System

Specifications for fasteners related to the exhaust system, specifically the exhaust manifold.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Torque to 33 ft-lbs (45 N·m). Use new gasket.

Fuel System

Specifications for fasteners related to the fuel system, including the fuel rail and fuel injectors.

1

Fuel Rail Bolts

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

Fuel Injector Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m).

Cooling System

Specifications for fasteners related to the cooling system, including the water pump and thermostat housing.

1

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m). Use a new gasket.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Torque to 70 ft-lbs (95 N·m).
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Torque to 11 ft-lbs (15 N·m). Use new gasket.
4

Coolant Temp Sensor

M10 x 1.0
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Torque to 14 ft-lbs (19 N·m).

Ignition System

Specifications for fasteners related to the ignition system, specifically ignition coil bolts and spark plugs.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque to 9 ft-lbs (12 N·m).
2

Spark Plugs

M12 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Torque to 18 ft-lbs (24 N·m).

Ancillary Components

Specifications for fasteners related to ancillary components such as the oil cooler.

1

Oil Cooler Bolts/Fittings

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Torque to 20 ft-lbs (27 N·m).

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 correct torque specifications important?

Using the correct torque specifications is crucial for ensuring proper clamping force and preventing issues such as component failure, leaks, and premature wear. Under-torquing can cause fasteners to loosen over time, leading to potential damage. Over-torquing can damage threads, strip fasteners, or even crack engine components. Correct torque application ensures long-term reliability and engine performance.

Q2

What type of torque wrench should I use?

A quality torque wrench is essential for achieving accurate torque. For most engine work, a 3/8" or 1/2" drive torque wrench is suitable. A click-type torque wrench is recommended for its ease of use and audible indication of reaching the set torque. Digital torque wrenches provide increased accuracy but are more expensive. Always ensure your torque wrench is calibrated regularly.

Q3

Do I need to replace bolts after removing them?

In many cases, yes. Certain bolts, especially those used in critical areas of the engine, are torque-to-yield (TTY) bolts, designed to stretch when tightened. These bolts must always be replaced when removed, even if they appear undamaged. Failure to do so can result in improper clamping force and potential engine failure. Check the specific torque specification for your bolt to verify TTY status.

Q4

What is 'torque-to-angle' and when is it used?

Torque-to-angle is a tightening method that involves tightening a bolt to a specific torque value and then tightening it an additional amount using degrees of rotation. It's commonly used with TTY bolts to achieve precise clamping force. The angle amount, given in the repair manual, will vary by application.

Q5

Can I reuse the cylinder head bolts?

No, cylinder head bolts on the 3.0L BMW engine are torque-to-yield and must be replaced whenever removed. Reusing these bolts will lead to improper clamping and could cause severe issues, including head gasket failure and coolant leaks. Always replace with new, quality-brand bolts.

Q6

Should I use lubricants when tightening bolts?

Yes, but only when indicated in the torque specifications. Some bolts require lubrication (e.g., engine oil or specific anti-seize) on the threads and under the bolt head. Lubrication changes the friction and, thus, the actual clamp load for a given torque. Always use the lubricant specified for that fastener, or you risk over-tightening.

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 capable of measuring torque values between 10 Nm and 200 Nm, essential for accurate bolt tightening.

  • Click-type mechanism for precise torque application
  • Clear, easy-to-read measurement markings
  • Durable construction for long-term use
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for bolts requiring lower torque values, typically ranging from 5 Nm to 50 Nm.

  • Suitable for tighter spaces
  • Higher precision at lower torque levels
  • Comfortable grip
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including common sizes for BMW engines (e.g., 8mm, 10mm, 13mm, 16mm, 18mm). Deep sockets may be necessary.

  • Wide range of socket sizes
  • Durable and hardened material
  • Clearly marked sizes
Learn more

Extension Bars

Extension bars of various lengths (3", 6", 10") to access bolts in recessed areas.

  • Allows access to hard-to-reach fasteners
  • Secure locking mechanism
  • Durable construction
Learn more

Universal Joint

Allows sockets to be used at an angle, providing additional access when a straight approach is not possible.

  • Wide range of motion
  • Durable construction
  • Secure connection
Learn more

E-Torx Sockets

A set of E-Torx sockets, commonly used on BMW engines (e.g., E8, E10, E12, E14, E16).

  • Specifically designed for E-Torx fasteners
  • High-quality construction
  • Precise fit
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Procedure for tightening the cylinder head bolts on the 3.0L N55 engine. This process involves multiple stages with specific torque and angle specifications.

  • Clean threads of cylinder block and cylinder head bolts.
  • Install cylinder head with new gasket.
  • First Stage: Tighten all bolts to 40 Nm.
  • Second Stage: Tighten all bolts to 70 Nm.
  • Third Stage: Angle tighten all bolts 90 degrees.
  • Fourth Stage: Angle tighten all bolts another 90 degrees.
View full procedure

Main Bearing Cap Bolt Tightening Procedure

Procedure for tightening the main bearing cap bolts on the 3.0L N55 engine. Correct torque is critical for crankshaft alignment and bearing function.

  • Clean threads of cylinder block and main bearing bolts.
  • Install main bearing caps with new bearings.
  • First Stage: Tighten all bolts to 20 Nm.
  • Second Stage: Tighten all bolts to 50 Nm.
  • Third Stage: Angle tighten all bolts 70 degrees.
View full procedure

Connecting Rod Bolt Tightening Procedure

Procedure for tightening the connecting rod bolts on the 3.0L N55 engine. Proper torque ensures secure connection between the connecting rod and crankshaft.

  • Clean threads of connecting rod bolts and connecting rods.
  • Install connecting rods and bearing caps with new bearings.
  • First Stage: Tighten all bolts to 20 Nm.
  • Second Stage: Angle tighten all bolts 70 degrees.
View full procedure

Valve Cover Bolt Tightening Procedure

Procedure for tightening valve cover bolts for the 3.0L N55 engine. Proper torque prevents oil leaks.

  • Clean threads of valve cover bolts and cylinder head.
  • Install valve cover with new gasket.
  • Tighten all bolts to 10 Nm in a cross pattern.
View full procedure

Oil Pan Bolt Tightening Procedure

Procedure for tightening the oil pan bolts for the 3.0L N55 engine. Proper torque is essential to prevent leaks.

  • Clean threads of oil pan bolts and engine block.
  • Install oil pan with new gasket.
  • Tighten all bolts to 10 Nm in a cross pattern.
View full procedure
Technical Service Bulletins

Engine Oil Leakage from Oil Pan

2014-05-15

Some 2012-2014 BMW 335i models with the N55 engine may exhibit oil leaks from the oil pan due to improper torque of the oil pan bolts.

2012-2014

Resolution: Inspect the oil pan for damage or warpage. Clean and reseal the oil pan with a new gasket, ensuring that all bolts are tightened to the specified 10 Nm using a cross-tightening pattern.

Cylinder Head Bolt Stretch Issue

2016-11-20

Reports of some 2015-2016 N55 engines experiencing cylinder head bolt stretch, causing gasket failures.

2015-2016

Resolution: Replace cylinder head bolts with updated part number. Follow the correct multi-stage tightening procedure using a calibrated torque wrench to ensure correct torque and angle.

Main Bearing Cap Bolt Fatigue

2017-02-28

Certain 2016-2017 N55 engines may experience main bearing cap bolt fatigue if proper torque is not adhered to during servicing or assembly.

2016-2017

Resolution: Always use new main bearing cap bolts and tighten to the manufacturer's specified 20Nm + 50 Nm + 70 degree angle sequence. Replace bolts after removal.

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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