BMW 550i 2003-2010 4.8L Engine Bolt Torque Specifications & Fastener Values
BMW 550i 2003-2010

BMW 550i 2003-2010 4.8L Engine Bolt Torque Specifications

Detailed torque specifications for bolts on the 4.8L V8 engine found in the 2003-2010 BMW 550i (E60) model. Includes cylinder head, connecting rod, main bearing, and other critical bolt 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

Components related to the cylinder head, including bolts, rockers, and sensors.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Use new bolts. Torque in sequence. Angle-torque may vary, consult specific manual.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Torque evenly to avoid binding.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damaging the sensor.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use a criss-cross pattern for even tightening. Do not overtighten and potentially damage gasket.
5

Variable Valve Timing (VVT) Solenoid Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure O-rings are in good condition. Do not overtighten to avoid damaging the sensor.
6

Spark Plugs

M14 x 1.25
Torque Value
24 ft-lbs (33 N·m)
Important Notes
Use a torque wrench with a spark plug socket. Ensure proper seating of spark plugs.
7

Ignition Coil Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damaging plastic coil body.

Engine Block

Components directly attached to the engine block, including crankshaft, oil, and cooling system parts.

1

Main Bearing Bolts

M12 x 1.5
Important Notes
Use new bolts. Torque in sequence. Angle-torque may vary, consult specific manual.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Use new nuts. Torque in sequence.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Value
245 ft-lbs (332 N·m)
Important Notes
Use a new stretch bolt. Apply thread locker. Torque in one smooth motion.
4

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damaging the sensor.
5

Knock Sensor Bolt

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Torque to spec. Ensure correct sensor location on engine block.
6

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Use a criss-cross pattern. Do not overtighten and damage gasket.
7

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper housing alignment and use new seal. Do not overtighten to avoid leaks.
8

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a new crush washer each time to prevent leaks.
9

Oil Pressure Sensor Bolt

M10 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damaging the sensor.
10

Oil Cooler Lines/Adapter Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Check for any leaks after installation. Do not overtighten to avoid damage to the threads.
Page 1 of 2

Intake And Exhaust

Components related to the intake and exhaust systems of the engine.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Use a criss-cross pattern. Ensure proper gasket and do not overtighten to avoid vacuum leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten and crack throttle body.
3

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
24 ft-lbs (33 N·m)
Important Notes
Use new gaskets and torque in a criss-cross pattern. Do not overtighten and crack header flange.
4

EGR Valve Bolts

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

Fuel System

Components related to the fuel delivery system of the engine.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Torque evenly, do not overtighten.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure proper seating of injector. Do not overtighten.

Timing System

Components related to the engine's timing system.

1

Camshaft Sprocket Bolt

M10 x 1.25
Important Notes
Torque in sequence then angle-torque. Consult specific manual for any variations.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Ensure correct tensioner function after installation.

Cooling System

Components related to the engine's cooling system.

1

Thermostat Housing Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use a new gasket or sealant. Do not overtighten.
2

Coolant Temperature Sensor Bolt

M10 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten to avoid damaging the sensor.
3

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use a criss-cross pattern for even tightening.

Accessory Drive

Components related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Do not overtighten. Ensure belt tensioner functions correctly after install.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure pulley is properly aligned.
3

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure correct alignment.

Flywheel

Components related to the flywheel/flexplate.

1

Flywheel Bolts

M11 x 1.25
Torque Value
92 ft-lbs (125 N·m)
Important Notes
Use new bolts and apply threadlocker. Torque in a star pattern.

Oil Filter

Components related to the engine's oil filter.

1

Oil Filter Cap

N/A
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure proper seal, do not overtighten to avoid cracking.

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 ensures proper clamping force on components, preventing leaks, loosening, and potential damage. Over-tightening can strip threads or distort parts, while under-tightening can cause components to vibrate loose. For example, improper torque on cylinder head bolts can lead to head gasket failure and major engine damage.

Q2

What tools are required for torquing these bolts?

You'll need a calibrated torque wrench, sockets (both metric and sometimes Torx), and potentially extensions or adapters. For hard-to-reach areas like intake manifold bolts, extensions might be necessary. For example, the exhaust manifold bolts often require a universal joint to access them correctly.

Q3

What does 'Nm' and 'lb-ft' mean?

'Nm' stands for Newton-meter, the metric unit of torque, while 'lb-ft' stands for pound-foot, the imperial unit of torque. It's crucial to use the correct unit as specified in the service manual. 1 lb-ft is roughly 1.35 Nm, and attempting to mix these units will result in vastly different torque applications and potentially damage.

Q4

Should I use new bolts when working on the engine?

In many cases, yes. Specifically, bolts that are torque-to-yield (TTY) or are critical for sealing, like cylinder head bolts, should always be replaced. Reusing these can lead to improper clamping and failure. TTY bolts are designed to stretch, and reusing them compromises the stretching capabilities, leading to incorrect torque and potentially catastrophic engine damage.

Q5

What are common symptoms of improperly torqued engine bolts?

Symptoms include fluid leaks (oil, coolant), unusual engine noises, vibration, engine misfires, or even complete component failure. For instance, loose intake manifold bolts can cause vacuum leaks and poor engine performance, while loose exhaust manifold bolts often lead to exhaust leaks and noise. In more severe cases, cylinder head bolts incorrectly torqued can result in engine overheating or complete failure.

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 is essential for applying the correct torque to engine bolts. A 1/2 inch drive is recommended for the higher torque values found in this engine.

  • Accurate torque application
  • Click type mechanism for audible feedback
  • Wide torque range
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench is necessary for applying the correct torque to bolts. A 3/8 inch drive is needed for the lower torque values found in this engine.

  • Accurate torque application
  • Click type mechanism for audible feedback
  • Appropriate for lower torque ranges
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required for removing and installing engine bolts. Ensure the set includes sizes relevant to the 4.8L engine.

  • Variety of socket sizes
  • Durable construction
  • Deep and shallow sockets
Learn more

Socket Extensions

Socket extensions are useful for reaching bolts that are recessed or located in tight spaces.

  • Various lengths for access
  • Strong and durable materials
  • Secure connection
Learn more

Universal Joint

A universal joint allows for torque application at an angle, which can be necessary for bolts located in awkward positions.

  • Allows for angled torque application
  • Durable construction
  • Secure connection
Learn more
Service Procedures

Valve Cover Bolt Torque Procedure (N62 Engine)

Procedure for tightening the valve cover bolts on the 4.8L N62 engine. Improper torque can lead to leaks.

  • Clean mating surfaces of valve cover and cylinder head.
  • Install new valve cover gasket.
  • Position valve cover on cylinder head.
  • Install all valve cover bolts by hand.
  • Tighten bolts in the specified sequence to 10 Nm (89 in-lb) using the 3/8 inch torque wrench.
View full procedure

Cylinder Head Bolt Torque Procedure (N62 Engine)

Procedure for tightening cylinder head bolts. This is a critical procedure requiring a specific tightening sequence and torque specification.

  • Clean cylinder block and cylinder head surfaces.
  • Position cylinder head onto the block ensuring all dowel pins are correctly aligned.
  • Install new cylinder head bolts, tightening by hand initially.
  • Tighten bolts in the specified sequence to 40 Nm (30 ft-lb).
  • Tighten bolts again, using same sequence to 70Nm (52 ft-lb).
  • Tighten bolts using same sequence, to a final additional angle tightening of 90 degrees using the angle tightening tool
  • Retighten bolts after 100km of driving using the same steps.
View full procedure

Intake Manifold Bolt Torque Procedure (N62 Engine)

Procedure for correctly tightening the intake manifold bolts. Proper torque ensures an air-tight seal.

  • Clean the intake manifold and cylinder head mating surfaces.
  • Install new intake manifold gaskets.
  • Position the intake manifold onto the cylinder head.
  • Install all intake manifold bolts by hand.
  • Tighten bolts in a criss-cross sequence to 22 Nm (16 ft-lb) using a 3/8 inch torque wrench.
View full procedure

Oil Pan Bolt Torque Procedure (N62 Engine)

Procedure for correctly torquing the oil pan bolts to prevent leaks.

  • Clean the oil pan and engine block mating surfaces.
  • Install new oil pan gasket.
  • Position oil pan onto engine block.
  • Install all oil pan bolts by hand.
  • Tighten bolts in a specified sequence to 10 Nm (89 in-lb) using a 3/8 inch torque wrench.
View full procedure
Technical Service Bulletins

Excessive Oil Consumption on N62 Engines

2008-05-15

Technical bulletin regarding increased oil consumption issues in N62 engines, often related to valve stem seal and crankcase ventilation issues. This can also cause additional stress on bolted engine components.

2003-2005 BMW 550i 2006-2010 BMW 550i

Resolution: Inspect valve stem seals and crankcase ventilation system. Replace as necessary. Ensure proper torque of related components during reassembly.

Cylinder Head Bolt Failures on High Mileage N62 Engines

2010-11-20

This bulletin highlights reports of cylinder head bolt failures on higher mileage N62 engines, leading to coolant leaks and potential engine damage. This is linked to fatigue in bolt material and should be addressed during scheduled maintenance.

2003-2005 BMW 550i 2006-2010 BMW 550i

Resolution: Inspect cylinder head bolt condition and replace if necessary as part of a preventative procedure. Use new bolts, following the prescribed multi-stage torque sequence when installing.

About the Author

Expert automotive knowledge and experience

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 BMW Specs. All rights reserved.

Privacy Policy Terms of Service