BMW X2 2017-present Drivetrain Bolt Torque Specifications & Fastener Values
BMW X2 2017-present

BMW X2 2017-present Drivetrain Bolt Torque Specifications

Comprehensive list of drivetrain bolt torque specifications for the 2017-Present BMW X2 (F39) including differential, driveshaft, and axle components.

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

Engine To Transmission

Fasteners related to connecting the engine and transmission, including the flywheel and the main transmission housing.

1

Flywheel Bolts

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force. These bolts are critical for proper clutch operation.
2

Transmission-to-Engine Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even clamping force. These are load bearing bolts.

Transmission Housing

Bolts securing the transmission assembly, including the main housing, mounting points and oil pan.

1

Transmission Mounting Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure proper alignment before tightening. These secure the transmission to the vehicle.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Tighten in a crisscross pattern to prevent leaks and evenly compress the gasket.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a new sealing washer or o-ring and do not over tighten.

Driveshaft And Axles

Bolts and nuts related to the drive axles, CV joints, and propeller shaft.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
These bolts connect the inner CV joint to the transmission or differential output flange. Tighten securely.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
180 ft-lbs (244 N·m)
Important Notes
This nut secures the outer CV joint to the wheel hub. Critical for proper wheel bearing preload.
3

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts connect the driveshaft to the transmission and differential. Tighten evenly to avoid vibration.
4

Center Support Bearing Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Tighten to secure center support bearing on multi piece driveshafts.

Differential

Bolts and plugs associated with the front and rear differential assembly.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Secures the differential to the chassis, should be tightened properly to avoid excessive vibration.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Use a new sealing washer or o-ring and do not over tighten.
3

Rear Differential Input Flange Bolt

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Critical for driveline performance when present.
4

Rear Differential Cover Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Tighten in a crisscross pattern to prevent leaks.

Transfer Case

Bolts and plugs associated with the transfer case on AWD and 4WD models.

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer or o-ring. Do not over tighten.

Starter Motor

Bolts associated with the starter motor assembly.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Ensure correct alignment and tighten securely.

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 it important to use the correct torque specifications for drivetrain bolts?

Using the correct torque specifications ensures proper clamping force, preventing bolts from loosening due to vibration or thermal expansion. Over-tightening can damage threads or stretch bolts, potentially leading to failure. Under-tightening can result in movement between components, causing wear, noise, or eventual failure. For example, insufficiently torqued driveshaft bolts might loosen during a drive, creating excessive play and potentially causing damage to other components. Correct torque values are crucial for the long-term reliability and safety of the drivetrain.

Q2

What happens if I over-torque a drivetrain bolt?

Over-torquing a bolt can stretch it beyond its yield strength, permanently deforming it. This can weaken the bolt, potentially leading to fracture under stress. In addition, over-torquing can damage the threads in the component into which the bolt is threaded, potentially causing a failure. An example of this would be over torquing the bolts on the differential causing the casting to crack or the bolt to break.

Q3

What happens if I under-torque a drivetrain bolt?

Under-torquing a bolt can prevent proper clamping force between components. This can lead to loosening, which can cause wear, noise (like a clunking sound), or even complete failure of the bolted connection. An example would be loose bolts on a driveshaft flange that would allow the flange to rock slightly, eventually damaging the mating surfaces.

Q4

Do I need to replace drivetrain bolts after removing them?

In many cases, yes. BMW often specifies the use of torque-to-yield (TTY) bolts for critical drivetrain components. TTY bolts are designed to stretch when tightened to the specified torque and are intended for single use only. Replacing these bolts ensures that they will clamp correctly. For example, differential mounting bolts on BMW X2s are typically TTY and should be replaced each time they are loosened. Consult the repair manual for bolt-specific replacement recommendations. Also inspect non-TTY bolts for damage before reusing them

Q5

What tools do I need to properly torque drivetrain bolts?

You will need a calibrated torque wrench, and the correct size sockets or wrenches for the specific bolts you are working with. Consider using a torque angle gauge when torque-angle tightening is required by BMW. It is important to ensure the torque wrench is accurate, if you do not have a calibrated wrench, consider having it calibrated or investing in one. Also consider using a breaker bar for initial loosening and for rotating bolts through an angle, especially during torque angle procedures. Never use the torque wrench for initial loosening. Failure to use the proper tools can cause inaccurate torque, which will lead to failure.

Q6

Are torque specifications the same for all drivetrain components on a BMW X2?

No, torque specifications vary widely depending on the component, the bolt size, material, and application. For example, driveshaft flange bolts will have a very different torque specification than the bolts holding the differential housing to the chassis. Always consult the appropriate BMW repair manual or technical documentation for the precise torque value for each specific application. Never assume they are all the same.

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 capable of measuring torque values within the specified range for drivetrain components.

  • Wide torque range (e.g., 20-200 Nm)
  • Audible click mechanism
  • Accurate measurement
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench capable of measuring torque values within the lower range specified for drivetrain components.

  • Lower torque range (e.g., 5-50 Nm)
  • Audible click mechanism
  • Accurate measurement
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various bolt heads found on the X2 drivetrain.

  • Variety of sizes (e.g., 10mm - 24mm)
  • 6-point sockets preferred
  • Deep sockets included
Learn more

Extension Bars

Various length extension bars to reach recessed drivetrain bolts.

  • Multiple lengths (e.g., 3 inch, 6 inch, 10 inch)
  • Secure locking mechanism
  • Durable construction
Learn more

Universal Joint Adapter

A universal joint adapter to access bolts at awkward angles.

  • Durable construction
  • Wide range of motion
  • Secure locking mechanism
Learn more
Service Procedures

Front Axle Driveshaft Bolt Torque Procedure

Detailed procedure for correctly torquing the bolts connecting the front driveshaft to the transmission and front differential.

  • 1. Identify the specific bolts requiring torque adjustment according to the BMW repair manual.
  • 2. Clean all bolt threads thoroughly.
  • 3. Apply a small amount of anti-seize compound (as specified in the repair manual) to the bolt threads if required.
  • 4. Using the correct socket, install each bolt finger tight.
  • 5. Following a star pattern, torque all bolts to the first specified torque value using the appropriate torque wrench.
  • 6. Following the same star pattern, perform the final torque to the second specified torque value, if specified by BMW.
  • 7. Double check all torqued bolts
View full procedure

Rear Differential Mounting Bolt Torque Procedure

Detailed procedure for correctly torquing the bolts securing the rear differential to the vehicle chassis.

  • 1. Identify the specific mounting bolts requiring torque adjustment according to the BMW repair manual.
  • 2. Clean all bolt threads thoroughly.
  • 3. Apply a small amount of thread locking compound (as specified in the repair manual) to the bolt threads if required.
  • 4. Install all bolts finger tight.
  • 5. Torque all bolts to the specified value using the appropriate torque wrench and socket.
  • 6. Double check all torqued bolts
View full procedure

Transfer Case Mounting Bolt Torque Procedure

Detailed procedure for correctly torquing the bolts securing the transfer case to the transmission and chassis (for xDrive models).

  • 1. Identify the specific mounting bolts requiring torque adjustment according to the BMW repair manual.
  • 2. Clean all bolt threads thoroughly.
  • 3. Apply a small amount of thread locking compound (as specified in the repair manual) to the bolt threads if required.
  • 4. Install all bolts finger tight.
  • 5. Torque all bolts to the specified value using the appropriate torque wrench and socket.
  • 6. Double check all torqued bolts
View full procedure
Technical Service Bulletins

Technical Bulletin: Drivetrain Vibration after Wheel Alignment

2020-07-15

Some 2017-2020 BMW X2 models may experience drivetrain vibration after a wheel alignment due to improper driveshaft bolt torque. This bulletin addresses this issue.

2017-2020

Resolution: Recheck all driveshaft bolts using the procedures for the specific driveshaft, ensuring the correct torque specification and tightening pattern is followed. Replace bolts if damaged or stretched.

Technical Bulletin: Rear Differential Whine Noise

2021-03-22

Some 2019-2021 BMW X2 models may exhibit a whining noise from the rear differential. Incorrect mounting bolt torque can contribute to this issue.

2019-2021

Resolution: Inspect the rear differential mounting bolts for proper torque specification. Re-torque as needed per specifications. If noise persists, inspect the differential itself for internal damage.

Technical Bulletin: Transfer Case Oil Leak

2022-11-01

Some 2020-2022 BMW X2 xDrive models may experience a transfer case oil leak due to loose or improperly torqued mounting bolts. This bulletin provides guidance for proper bolt torque procedure.

2020-2022

Resolution: Verify torque of transfer case mounting bolts. Replace any damaged seals. Use proper torque procedure.

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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