BMW 745i 2020-present 3.0L Engine Bolt Torque Specifications & Fastener Values
BMW 745i 2020-present

BMW 745i 2020-present 3.0L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 3.0L engine of the 2020-Present BMW 745i (G11/G12) generation. Includes cylinder head, main bearing cap, connecting rod, oil pan, and other critical engine component bolt torque values. Use these specifications to ensure proper engine assembly and function.

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 directly related to the cylinder head, crucial for combustion sealing and valvetrain stability.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Use a multi-step tightening sequence following a specific pattern. Final torque is achieved through angular tightening. Bolts are typically torque-to-yield and must be replaced when removed.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure even clamping for proper valvetrain operation. Can also be an M6
3

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten using the proper sequence starting from the center and working outwards to ensure even pressure and prevent exhaust leaks.
4

Spark Plugs

M14 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque is crucial for good electrical and thermal contact. Do not over-tighten.

Crankshaft And Rotating Assembly

Torque specifications for components related to the crankshaft, connecting rods, and flywheel, crucial for smooth engine operation and power transfer.

1

Main Bearing Bolts

M10 x 1.5
Important Notes
Follow a multi-step tightening procedure and proper sequence to ensure proper crankshaft bearing clearances. Final torque is achieved via an angle.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Must be torqued in multiple stages, with final torque achieved using an angle.
3

Flywheel Bolts

M10 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Ensure proper seating of the flywheel/flexplate against the crankshaft flange. Can also be a M12.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 2.0
Torque Value
90 ft-lbs (122 N·m)
Important Notes
High torque is essential to secure the pulley. Ensure proper alignment of pulley. Can be an M16 or M20.

Engine Block

Torque specifications for components that secure to the engine block.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Overtightening can warp the pan or cause leaks. Use the proper gasket.
2

Water Pump Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent coolant leaks. Ensure the water pump is properly seated to the block.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Use a new crush washer to ensure a proper seal. Do not over-tighten.

Valvetrain

Torque specifications for camshafts, timing system and related components.

1

Camshaft Sprocket Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures correct valve timing and prevents damage. Ensure proper sprocket alignment.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Crucial for maintaining proper valve timing, and proper belt/chain tension.
3

Variable Valve Timing (VVT) Actuator Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Ensure proper actuator alignment and no binding. Can also be an M8.

Intake And Exhaust

Torque specifications for intake and exhaust system components, essential for proper engine airflow and emissions control.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten using the specified sequence for even clamping and to prevent vacuum leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Proper seal is needed to prevent vacuum leaks.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing to prevent vacuum leaks and ensure proper EGR functionality. Can be M6.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Use the specified sequence starting from the center and working outwards to ensure even pressure and prevent exhaust leaks.

Fuel System

Torque specifications for fuel rail, injectors and related components.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Proper torque is essential for preventing fuel leaks. Can also be a 8mm
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Ensure proper seating and sealing of the fuel injectors. Can be an 8mm.

Cooling System

Torque specifications for components related to the cooling system to prevent leaks and ensure proper engine cooling.

1

Thermostat Housing Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Ensure proper sealing to prevent coolant leaks. Can also be an 8mm bolt.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Ensure the pulley is flush with the pump before tightening. Can also be an 8mm

Engine Sensors

Torque specifications for various engine sensors, ensuring accurate readings and proper function.

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensures proper sensor alignment and reading accuracy. Estimated value, can also be an M8.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Proper torque prevents damage and ensures accurate readings. Estimated value, can also be an M8.
3

Coolant Temperature Sensor

M12 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque is critical to prevent coolant leaks and ensure accurate readings. This is a threaded sensor, not a bolt.
4

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures the sensor works correctly and protects the engine from pre-ignition.

Accessory Drive

Torque specifications for the accessory drive system components.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Proper torque ensures correct belt tension and system function.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure pulley is properly aligned before tightening.

Misc Fasteners

Torque specifications for various fasteners that don't fit into a specific category.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Proper torque to ensure oil seal is met without damaging the cover.
2

Ignition Coil Bolt

M6 x 1.0
Torque Value
10 ft-lbs (13 N·m)
Important Notes
Ensure the coil is properly seated. Can be an 8mm.

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 the 3.0L engine?

Correct torque specifications are critical to ensure proper clamping force, prevent leaks, and avoid component failure on your 3.0L engine. Under-torquing can lead to loosening, leaks, and eventual engine damage. Over-torquing can strip threads, distort components, and also lead to premature failure. For instance, improperly torqued cylinder head bolts can lead to a blown head gasket and significant engine damage.

Q2

Should I reuse torque-to-yield (TTY) bolts?

No, torque-to-yield (TTY) bolts, often used in critical engine areas like cylinder heads and connecting rods, should NEVER be reused. These bolts stretch upon installation and will not provide the necessary clamping force if used again. Always replace TTY bolts with new ones when disassembling components on the 3.0L engine. Reusing a TTY bolt on a 3.0L head can result in catastrophic head gasket failure.

Q3

Do I need a torque wrench for all these specifications?

Yes, a torque wrench is essential for achieving accurate torque values when working on the 3.0L engine. Relying on 'feel' is not accurate enough, especially for critical components. A click-type or digital torque wrench calibrated in Newton-meters (Nm) is recommended. If you are tightening a crank pulley bolt, without the exact torque specification, it could work loose and cause severe damage.

Q4

What should I do if I strip a bolt hole while torquing?

Stripped threads require repair. Depending on the severity and location, you may need to use a thread repair kit (Helicoil) or, in extreme cases, replace the component. For example, if a spark plug thread in the cylinder head strips, using a Helicoil is a much cheaper option than replacing the entire cylinder head.

Q5

Do torque specifications change if I use aftermarket parts?

Generally, the torque specifications should follow the manufacturer's recommendations, but it's important to check the instructions included with the aftermarket part, as they may have slightly different torque settings. For example, some aftermarket turbocharger kits might require different bolt torque values than the stock system. When in doubt, defer to the aftermarket instructions.

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 is essential for accurately tightening bolts to specified torque values.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Audible click or digital readout for accurate torque application
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench is essential for accurately tightening smaller bolts to specified torque values.

  • Lower torque range (e.g., 5-75 ft-lbs)
  • Audible click or digital readout for accurate torque application
Learn more

Socket Set (Metric)

A comprehensive socket set is required to fit the various bolt head sizes on the 3.0L engine.

  • Variety of sizes (e.g., 8mm - 19mm)
  • 6-point and 12-point sockets
Learn more

Socket Extensions

Extensions to reach bolts in recessed areas of the engine bay.

  • Various lengths
  • Durable material
Learn more

Universal Joint

Allows sockets to be used at an angle.

  • Allows access to awkward bolts
  • Durable construction
Learn more

Torque Angle Meter

Required for bolts that need to be torqued to a specific angle after the initial torque value has been met.

  • Accurately measures the degree of rotation
  • Attaches to the torque wrench
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure (3.0L)

Proper tightening sequence is crucial for correct cylinder head gasket sealing and compression. Consult BMW’s repair information system for full specifications.

  • Clean bolt threads and bolt holes in the engine block.
  • Apply a small amount of engine oil to the bolt threads.
  • Install all cylinder head bolts by hand.
  • Tighten all bolts in the correct sequence to the first torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the second torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the final torque angle stage using the appropriate tool and torque angle meter.
View full procedure

Main Bearing Cap Bolt Torque Procedure (3.0L)

Main bearing cap bolts should be tightened to ensure proper crankshaft alignment. Follow the specified procedure for your 3.0L engine variant.

  • Clean bolt threads and bolt holes in the engine block.
  • Apply a small amount of engine oil to the bolt threads.
  • Install all main bearing cap bolts by hand.
  • Tighten all bolts in the correct sequence to the first torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the second torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the final torque angle stage using the appropriate tool and torque angle meter.
View full procedure

Connecting Rod Cap Bolt Torque Procedure (3.0L)

Proper connecting rod cap torque is essential to avoid bearing damage. Follow the specified procedure.

  • Clean bolt threads and bolt holes in the connecting rod.
  • Apply a small amount of engine oil to the bolt threads.
  • Install all connecting rod bolts by hand.
  • Tighten all bolts in the correct sequence to the first torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the second torque stage using the appropriate tool.
  • Tighten all bolts in the correct sequence to the final torque angle stage using the appropriate tool and torque angle meter.
View full procedure

Oil Pan Bolt Torque Procedure (3.0L)

Proper oil pan torque ensures a leak-free seal. Follow the correct tightening sequence and torque values.

  • Clean the oil pan and engine block mating surfaces.
  • Install all oil pan bolts by hand.
  • Tighten all bolts in a crisscross pattern using the appropriate tool to the specified torque.
View full procedure

Intake Manifold Bolt Torque Procedure (3.0L)

Proper intake manifold torque ensures correct sealing and airflow. Follow the specified procedure.

  • Clean the intake manifold and cylinder head mating surfaces.
  • Install all intake manifold bolts by hand.
  • Tighten all bolts in a crisscross pattern using the appropriate tool to the specified torque.
View full procedure
Technical Service Bulletins

SIB 11 02 21: Revised Cylinder Head Bolt Torque Specification

2021-02-15

A revised cylinder head bolt torque specification has been issued to prevent premature gasket failure. This bulletin updates previous procedures.

2020-2021 BMW 745i

Resolution: Follow the updated torque procedure and tightening sequence outlined in this bulletin using the proper torque angle method.

SIB 11 05 22: Connecting Rod Bolt Inspection and Torque Update

2022-05-01

New quality control measures and revised torque values for connecting rod bolts have been implemented. Inspection of bolts is recommended.

2020-2022 BMW 745i

Resolution: Inspect all connecting rod bolts. Replace bolts with the new part number if damaged. Follow the updated torque procedure.

SIB 11 03 23: Oil Pan Bolt Retorque Recommendation

2023-03-10

Some cases of oil seepage have been reported with the original oil pan torque specification. A retorque after a brief break in period is advised.

2020-2023 BMW 745i

Resolution: After the initial oil change, remove the underbody panel and retorque all oil pan bolts to the updated value.

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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