BMW 740i 2008-2015 Suspension Bolt Torque Specifications & Fastener Values
BMW 740i 2008-2015

BMW 740i 2008-2015 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2008-2015 BMW 740i (F01/F02) chassis. Includes front and rear suspension component 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

Strut Assembly

Specifications for fasteners related to the front strut assembly, which includes the shock absorber, spring, and upper mount.

1

Strut/Shock Absorber Mounting Bolts (Lower)

M14 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Secures the lower portion of the strut assembly to the steering knuckle. Use a new bolt if the old one is torque-to-yield.
2

Lower Strut Mount Bolt to Steering Knuckle

M14 x 1.5
Important Notes
This bolt connects the bottom of the strut to the steering knuckle. This is a torque-to-yield fastener and must be replaced when removed. The angle torque method is critical for proper preload.
3

Upper Strut Mount Nuts/Bolts

M8 x 1.25
Important Notes
Secures the top of the strut assembly to the vehicle's chassis or strut tower. Use a new nut if the old one is torque-to-yield. It is critical to follow the torque procedure correctly.

Control Arms

Specifications for bolts and nuts that attach control arms to the vehicle's frame and steering knuckle.

1

Control Arm Bolts

M14 x 2.0
Torque Value
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the control arms to the vehicle's chassis. Ensure the vehicle is at normal ride height when tightening to prevent premature bushing wear. Estimated thread pitch

Steering

Specifications for nuts and bolts related to steering components, such as tie rods and ball joints.

1

Ball Joint Nut

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Fastens the ball joint to either the control arm or the steering knuckle. A castle nut and cotter pin might be used; if so, tighten to the specified torque and then align the castle nut to the cotter pin hole. Do not loosen to align the cotter pin
2

Tie Rod End Nut

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Secures the tie rod end to the steering knuckle. A castle nut and cotter pin might be used; if so, tighten to the specified torque and then align the castle nut to the cotter pin hole. Do not loosen to align the cotter pin

Sway Bar

Specifications for nuts and bolts related to sway bar links and sway bar bracket mounts.

1

Sway Bar Link Nut

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Attaches the sway bar links to the sway bar and suspension components. Use new nuts if old nuts are torque-to-yield. Estimated thread pitch
2

Sway Bar Bracket Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Holds the sway bar brackets to the chassis. Ensure proper bracket alignment before final torque. Estimated thread pitch

Subframe

Specifications for fasteners attaching the subframe to the vehicle chassis.

1

Subframe/Crossmember Bolts

M14 x 2.0
Important Notes
Secures the subframe or crossmember to the vehicle body. Torque these bolts in a crisscross pattern. These are torque-to-yield fasteners and must be replaced when removed.

Rear Suspension

Specifications for fasteners specific to the rear suspension, such as trailing arms and ride height sensors.

1

Trailing Arm Bolts

M14 x 2.0
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Attaches the trailing arms to the vehicle body. Ensure the vehicle is at its normal ride height when tightening to prevent premature bushing wear. Estimated thread pitch
2

Ride Height Sensor Link Nut

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Connects the ride height sensor to the suspension components. Use caution to not over-tighten as this can damage the sensor. Estimated thread pitch

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 for suspension bolts?

Correct torque specifications are crucial to ensure the proper clamping force on suspension components. Under-torquing can lead to bolts loosening, causing instability, noise, and potential component failure. Over-torquing can stretch or break bolts, damage threads, and also lead to failure. Both scenarios can result in dangerous driving conditions.

Q2

Where can I find the specific torque specifications for my BMW 740i?

The most reliable source for torque specifications is the official BMW repair manual or a reputable online database specializing in BMW vehicles. These often specify torque in Newton-meters (Nm) and sometimes foot-pounds (ft-lb). Generic guides might not be accurate for your specific model year and chassis code (F01, F02). Using the correct manual for the specific year and model is essential. It is best to find the manual specific to the F01 chassis

Q3

Do I need special tools to tighten suspension bolts?

Yes, a torque wrench is absolutely essential for tightening suspension bolts to the correct specifications. Using a standard wrench and guessing at tightness is very dangerous. Some bolts might require specialized sockets or tools, such as hex or triple square bits. It is recommended to have both a lower-range torque wrench and a higher-range torque wrench to cover the different types of bolts on the suspension system.

Q4

Should I replace suspension bolts when working on the suspension?

It is highly recommended to replace critical suspension bolts, especially those that are 'stretch bolts' or 'torque-to-yield' bolts, after they have been removed. These bolts are designed to stretch slightly upon tightening. Reusing them can lead to improper clamping force and potentially failure. BMW often identifies these bolts in the repair manual with a note about replacement.

Q5

What happens if I hear noises after tightening suspension bolts?

If you hear clunking, creaking, or other unusual noises after working on your suspension, it could indicate improperly torqued bolts, worn components, or interference between parts. It's important to immediately inspect all the work, check the torque of the bolts you touched, and if necessary, have a qualified professional inspect the car if the problem continues. Ignoring these sounds can lead to a more dangerous situation or additional costly repairs.

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 suspension bolts to the manufacturer's specifications. A 1/2" drive is recommended for the higher torque values found in suspension components.

  • Wide torque range (e.g., 20-200 ft-lbs)
  • Audible click or digital readout
  • Calibration certificate
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench may be required for smaller suspension components, fasteners, and torque specifications, or for fasteners in tighter areas.

  • Smaller size for tighter areas
  • Torque range more suited for smaller bolts
  • Audible click or digital readout
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolt and nut sizes on the BMW 740i suspension.

  • Wide range of metric sizes (e.g., 10mm to 24mm)
  • 6-point sockets for optimal grip
  • Various depths and drive sizes
Learn more

Extension Bars

Extension bars are necessary to reach bolts that are recessed or located in difficult-to-access areas within the suspension.

  • Various lengths for different reaches
  • Durable construction
  • Compatible with socket set
Learn more

Swivel Adapter

A swivel adapter allows for angled access to bolts and nuts, enabling torque application in awkward positions within the suspension assembly.

  • Allows for angled socket application
  • Durable construction
  • Compatible with socket set and extension bars
Learn more
Service Procedures

Front Strut Lower Bolt Torque Procedure

Properly torqueing the front strut lower bolts is critical for front suspension stability and alignment. Ensure proper thread engagement before applying torque.

  • Locate the two lower strut bolts.
  • Using the appropriate socket and torque wrench, tighten the bolts to the specified torque (typically around 80-100 Nm, final torque may vary, check specific service documentation).
  • Recheck the torque after a short drive, or after lowering the vehicle to the ground.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

Correctly torqueing the rear lower control arm bolts ensures proper suspension geometry and prevents binding. It's important to ensure the suspension is in a normal ride height state.

  • Locate the lower control arm bolts where the control arm connects to the subframe and spindle.
  • Using the appropriate socket and torque wrench, tighten the bolts to the specified torque (typically around 100-120 Nm, final torque may vary, check specific service documentation).
  • Tighten the bolts while the suspension is under load and in a normal ride height.
View full procedure

Sway Bar End Link Bolt Torque Procedure

Correct torque of sway bar end link bolts is necessary for effective anti-roll functionality. Often a second wrench may be required to keep the bolt from spinning.

  • Locate the sway bar end link bolts.
  • Using the appropriate socket and torque wrench, tighten the bolts to the specified torque (typically around 60-80 Nm, final torque may vary, check specific service documentation).
  • Use a secondary wrench to prevent the ball joint from spinning.
View full procedure
Technical Service Bulletins

Suspension Bolt Loosening Issue - Front Strut

2011-05-15

Some 2008-2011 BMW 740i vehicles may experience front strut lower bolt loosening due to manufacturing tolerances.

2008-2011

Resolution: Replace front strut lower bolts with updated part numbers and apply the revised torque specification. Use thread locking compound.

Rear Control Arm Bolt Fatigue

2014-11-20

2012-2015 model year BMW 740i vehicles may exhibit rear control arm bolt fatigue causing noise and handling issues.

2012-2015

Resolution: Inspect rear control arm bolts for cracks or fatigue. If any damage is found replace bolts and tighten to the revised torque specification with thread locking compound.

Sway Bar End Link Bolt Failure

2013-07-01

Some 2008-2013 model year vehicles have experienced sway bar end link bolt failure, mainly due to incorrect torque and over stressing.

2008-2013

Resolution: Verify the end links are in good condition and replace the end link bolts to the revised specification. Pay attention to correct torquing.

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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