BMW i3 2014-present Body Panel & Frame Bolt Torque Specifications
BMW i3 2014-present

BMW i3 2014-present Body & Frame Bolt Torque Specifications

Detailed torque specifications for body bolts on the 2014 to present BMW i3. Includes values for various locations throughout the vehicle.

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

Fuel System

Torque specifications for components related to the fuel system, ensuring proper sealing and secure mounting.

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures fuel tank straps to the chassis. Proper torque prevents tank movement and potential leaks.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Attaches the fuel filler neck to the body. Proper torque ensures a leak-proof seal.

Door System

Torque specifications for door hinges and related hardware to ensure proper door alignment and function.

1

Door Hinge Bolts (to Body) - M8

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures door hinge to the body. Proper torque is critical for door alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
2

Door Hinge Bolts (to Body) - M10

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures door hinge to the body. Proper torque is critical for door alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.

Fender System

Torque specifications for fender mounting bolts, ensuring proper alignment and secure attachment to the vehicle body.

1

Fender Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the fender to the vehicle body. Proper torque prevents vibration and ensures proper alignment. Some vehicles use TTY bolts which must be replaced.

Hood System

Torque specifications for hood hinges and latch to ensure proper function, alignment, and safe operation.

1

Hood Hinge Bolts (to Body) - M8

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures hood hinge to the body. Proper torque ensures hood alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
2

Hood Hinge Bolts (to Body) - M10

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures hood hinge to the body. Proper torque ensures hood alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
3

Hood Latch Bolt (to Hood)

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Attaches the hood latch to the hood. Proper torque ensures the hood latch will function correctly.

Bumper System

Torque specifications for bumper mounting bolts, ensuring secure attachment and structural integrity of the bumper system.

1

Bumper Mounting Bolts - M8

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures bumper to the vehicle body. Proper torque is essential for bumper stability and safety.
2

Bumper Mounting Bolts - M10

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures bumper to the vehicle body. Proper torque is essential for bumper stability and safety.

Lighting System

Torque specifications for headlight and taillight mounting bolts to ensure proper alignment and secure attachment of the lighting fixtures.

1

Headlight Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Attaches the headlight assembly to the body. Proper torque prevents misalignment and ensures secure fit.
2

Taillight Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the taillight assembly to the body. Proper torque prevents movement and ensures secure fit.

Body Panels Trim

Torque specifications for various body panels and trim components, ensuring proper attachment and prevention of vibration or damage.

1

Interior Trim Mounting Screws

M4 x 0.7
Torque Value
3.5 ft-lbs (5 N·m)
Important Notes
Attaches interior plastic trim panels. Proper torque prevents cracking and ensures secure fit.
2

Exterior Trim Mounting Screws

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Attaches exterior trim panels and covers. Proper torque prevents looseness and vibration.

Seating System

Torque specifications for seat mounting bolts, ensuring secure attachment of seats to the vehicle floor for safety and stability.

1

Seat Mounting Bolts (to Floor)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures seats to the vehicle floor. Proper torque is critical for safety. Some vehicles use TTY bolts which must be replaced.

Seatbelt System

Torque specifications for seat belt mounting bolts to ensure the safety of the occupants.

1

Seat Belt Mounting Bolts/Nuts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures seat belts to the vehicle body. These bolts are critical for safety. Some vehicles use TTY bolts which must be replaced.

Sunroof System

Torque specifications for sunroof frame mounting bolts, ensuring proper sealing and operation.

1

Sunroof Frame Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Attaches the sunroof frame to the vehicle body. Proper torque ensures proper sealing and operation of the sunroof.

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 body bolts?

Correct torque is crucial for ensuring proper clamping force, which prevents bolts from loosening due to vibration or stress. Over-tightening can damage the bolt, threads, or the body panel, while under-tightening can lead to panels shifting, rattles, and potential safety issues. For example, a loose bumper bolt can cause misalignment and affect the functionality of parking sensors.

Q2

What happens if I over-tighten body bolts?

Over-tightening body bolts can stretch or break the bolt, strip the threads in the body panel, or even deform the panel itself. This can necessitate costly repairs, such as welding in new threaded inserts. Imagine trying to remove a bolt that was overtightened; it will be very difficult to remove without breaking it or the insert.

Q3

Can I use a general torque setting for all body bolts?

No, torque settings vary based on the bolt size, material, and application. Always consult the specific torque specifications for each bolt. Using a universal torque can lead to over or under tightening, which can be catastrophic in the long run.

Q4

Do I need to use new bolts when reassembling body panels?

While not always required for every bolt, it's good practice to replace self-locking or stretch bolts as they are designed for single use. Always check the BMW repair manual for specific guidance. Reusing a stretched bolt can lead to improper torque and failure.

Q5

Should I use lubricant on body bolts?

Generally, no. Unless specified in the BMW repair manual, do not use lubricant on body bolts, as it will affect the specified torque value. Lubricant can cause bolts to be over-tightened when trying to achieve a specific torque, potentially damaging parts.

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 (1/4" Drive)

A 1/4" drive torque wrench is essential for applying precise torque to smaller body bolts.

  • Accurate torque measurement in Nm (Newton-meters)
  • Click-type mechanism for audible feedback
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is necessary for medium-sized body bolts.

  • Higher torque range than 1/4" drive
  • Durable construction
Learn more

Socket Set (Metric)

A comprehensive metric socket set is required to fit the various sizes of body bolts on the BMW i3.

  • Variety of sizes from 8mm to 19mm (approximate)
  • 6-point sockets for secure grip
Learn more

Torx Socket Set

Torx sockets are needed for specific fasteners found on the BMW i3 body.

  • Includes common torx sizes such as T20, T25, T30, T40.
  • Durable construction for high-torque applications
Learn more

Extension Bars

Extension bars of various lengths are needed to reach recessed or hard-to-access body bolts.

  • Available in 3", 6", and 10" lengths (approximate)
  • Provides flexibility and clearance
Learn more
Service Procedures

Front Bumper Cover Removal and Installation

Procedure for removing and reinstalling the front bumper cover, including torque specifications for all associated fasteners.

  • Remove screws/bolts from wheel well liner.
  • Remove upper fasteners securing the bumper cover to the body.
  • Carefully pull the bumper cover forward, disconnecting wiring if necessary.
  • When reinstalling, ensure proper alignment.
  • Torque all fasteners to specifications
View full procedure

Rear Bumper Cover Removal and Installation

Procedure for removing and reinstalling the rear bumper cover, including torque specifications for all associated fasteners.

  • Remove screws/bolts from wheel well liner.
  • Remove fasteners securing the bumper cover to the body.
  • Carefully pull the bumper cover rearward, disconnecting wiring if necessary.
  • When reinstalling, ensure proper alignment.
  • Torque all fasteners to specifications
View full procedure

Side Skirt Removal and Installation

Procedure for removing and reinstalling the side skirts, including torque specifications for all associated fasteners.

  • Remove bolts/screws from the underside of the vehicle
  • Remove the plastic rivets along the side skirt edge
  • Carefully pull the side skirt away from the body
  • When reinstalling, ensure proper alignment.
  • Torque all fasteners to specifications
View full procedure

Door Panel Removal and Installation

Procedure for removing and reinstalling the interior door panel, including torque specifications for all associated fasteners.

  • Remove trim pieces around door handles and switches.
  • Remove visible screws securing the panel.
  • Using a pry tool, carefully separate the panel from the door
  • When reinstalling, ensure proper alignment.
  • Torque all fasteners to specifications
View full procedure
Technical Service Bulletins

Possible Loose Fasteners in Bumper Assembly

2018-07-15

Some BMW i3 vehicles may exhibit loose fasteners in the bumper assembly leading to increased vibration and noise. It is recommended to inspect all bumper fasteners.

2014-2017

Resolution: Inspect all bumper fasteners and torque to specified values. Replace any damaged fasteners.

Corrosion of Side Skirt Mounting Hardware

2020-03-20

Vehicles operating in harsh environments may exhibit corrosion of the side skirt mounting hardware. Inspect the mounting points and fasteners for rust.

2014-2020

Resolution: Remove affected hardware, clean mounting surfaces, and replace corroded fasteners. Apply corrosion protectant.

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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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