BMW 340i 2019-present Body & Frame Bolt Torque Specifications
This page provides a comprehensive list of torque specifications for body bolts on the 2019-Present BMW 340i (G20/G21). Includes values in Newton-meters (Nm) and foot-pounds (ft-lbs).
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
Wheels And Tires
Torque specifications for components directly related to wheel and tire mounting.
1 Wheel Lug Nuts
M14 x 1.25
Wheel Lug Nuts
M14 x 1.25Torque Value
Important Notes
Fuel System
Torque specifications for components related to the fuel tank and fuel delivery system.
1 Fuel Tank Strap Bolts
M8 x 1.25
Fuel Tank Strap Bolts
M8 x 1.25Torque Value
Important Notes
2 Fuel Filler Neck Bolts
M6 x 1.0
Fuel Filler Neck Bolts
M6 x 1.0Torque Value
Important Notes
Doors
Torque specifications for door-related components including hinges and latches.
1 Door Hinge Bolts (Body Side)
M8 x 1.25
Door Hinge Bolts (Body Side)
M8 x 1.25Torque Value
Important Notes
2 Door Latch Striker Bolts
M8 x 1.25
Door Latch Striker Bolts
M8 x 1.25Torque Value
Important Notes
Hood
Torque specifications for components related to the hood.
1 Hood Hinge Bolts (Body Side)
M8 x 1.25
Hood Hinge Bolts (Body Side)
M8 x 1.25Torque Value
Important Notes
Fenders
Torque specifications for fender components, including inner and outer panels.
1 Fender Bolts (Inner)
M6 x 1.0
Fender Bolts (Inner)
M6 x 1.0Torque Value
Important Notes
2 Fender Bolts (Outer)
M8 x 1.25
Fender Bolts (Outer)
M8 x 1.25Torque Value
Important Notes
Bumpers
Torque specifications for bumper cover mounting components.
1 Bumper Cover Mounting Bolts/Nuts (Smaller)
M6 x 1.0
Bumper Cover Mounting Bolts/Nuts (Smaller)
M6 x 1.0Torque Value
Important Notes
2 Bumper Cover Mounting Bolts/Nuts (Larger)
M8 x 1.25
Bumper Cover Mounting Bolts/Nuts (Larger)
M8 x 1.25Torque Value
Important Notes
Lighting
Torque specifications for headlight and taillight mounting.
1 Headlight Mounting Bolts
M6 x 1.0
Headlight Mounting Bolts
M6 x 1.0Torque Value
Important Notes
2 Taillight Mounting Bolts
M6 x 1.0
Taillight Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Grille
Torque specifications for grille mounting components.
1 Grille Mounting Bolts/Screws
M5 x 0.8
Grille Mounting Bolts/Screws
M5 x 0.8Torque Value
Important Notes
Side Skirts
Torque specifications for side skirt/rocker panel mounting.
1 Side Skirt/Rocker Panel Mounting Bolts/Screws
M6 x 1.0
Side Skirt/Rocker Panel Mounting Bolts/Screws
M6 x 1.0Torque Value
Important Notes
Windshield Cowl
Torque specifications for the windshield cowl mounting components.
1 Windshield Cowl Bolts
M6 x 1.0
Windshield Cowl Bolts
M6 x 1.0Torque Value
Important Notes
Rear Hatch Trunk
Torque specifications for components related to the rear hatch/trunk lid.
1 Rear Hatch/Trunk Lid Hinge Bolts (Body Side)
M8 x 1.25
Rear Hatch/Trunk Lid Hinge Bolts (Body Side)
M8 x 1.25Torque Value
Important Notes
2 Rear Hatch/Trunk Lid Latch Striker Bolts
M8 x 1.25
Rear Hatch/Trunk Lid Latch Striker Bolts
M8 x 1.25Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 body bolts?
Why is it important to use the correct torque specifications for body bolts?
Using the correct torque ensures a proper and secure fit of body panels and components. Over-tightening can damage the bolt, the panel, or the threads. Under-tightening can lead to loose panels, vibrations, rattles, and potential safety issues. Correct torque provides the clamping force necessary for the body's structural integrity and proper alignment. For example, a bumper bolt that is not torqued properly could fall off while driving, causing a hazard.
Q2 What type of tool should I use to torque body bolts?
What type of tool should I use to torque body bolts?
A torque wrench is essential for accurately tightening body bolts to the specified torque. Using a standard wrench and 'feel' is not reliable and can easily lead to over or under-tightening. Use a calibrated torque wrench and follow its operating instructions. For smaller bolts, consider a smaller inch-pound torque wrench; for larger bolts, a foot-pound one.
Q3 Can I reuse body bolts?
Can I reuse body bolts?
While some body bolts can be reused, it is generally recommended to replace self-locking bolts or those that have been subjected to high stress. These types of bolts will usually have a prevailing torque which degrades with each use. Always inspect bolts for damage, stretching, or corrosion before reuse. If in doubt, always replace the bolt to prevent issues such as a loose panel later. If you see thread damage or if the head is misshapen, always replace the bolt.
Q4 What should I do if I suspect I've over-tightened a body bolt?
What should I do if I suspect I've over-tightened a body bolt?
If you suspect you have over-tightened a body bolt, stop immediately. Do not attempt to loosen it unless you have a proper torque wrench. It is best to carefully loosen the bolt and then re-torque to the correct specification. Inspect the bolt and the receiving threads for any damage; if you see damage, replace both immediately before re-installing. If you suspect thread damage but cannot verify it, attempt to install a new bolt and check resistance; if resistance exists and is high, repair threads before replacing bolt.
Q5 How often should I check the torque of body bolts?
How often should I check the torque of body bolts?
Regularly checking the torque on body bolts is generally not required unless you have recently performed work on the body panels. However, if you frequently drive on rough roads or if you notice rattles or vibrations from body panels, it's a good idea to inspect and check the torque of relevant bolts. Always consult your vehicle's repair manual and BMW recommended maintenance schedule for details regarding body bolt torque checks.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 achieving accurate bolt torque specifications. A 1/2" drive is suitable for most body bolts.
- Click-type mechanism for accurate torque application
- Wide torque range to cover various bolt sizes
- Durable construction for long-term use
Torque Wrench (3/8" Drive)
A smaller 3/8" drive torque wrench may be required for some smaller body bolts or tight spaces.
- Click-type mechanism for accurate torque application
- Smaller size for better maneuverability
- Precise torque settings for smaller bolts
Socket Set (Metric)
A comprehensive metric socket set is necessary to fit various body bolt head sizes. Includes both standard and deep sockets.
- Various sizes to fit all body bolt heads
- 6-point sockets for a secure grip
- Durable chrome vanadium construction
Socket Extensions
Socket extensions provide added reach when working in tight spaces or accessing deeply recessed bolts.
- Various lengths to accommodate different situations
- Strong construction for added durability
- Ball-detent feature to securely hold sockets
Universal Joint
A universal joint allows the socket to pivot, useful when working on bolts in awkward angles.
- Allows for angled access to bolts
- Durable and robust construction
- Compatible with standard socket drives
Service Procedures
Front Bumper Cover Removal and Installation
This procedure details how to remove and reinstall the front bumper cover of a 2019+ BMW 340i, ensuring all fasteners are torqued to the correct specifications.
- Disconnect any sensors or wiring attached to the bumper cover.
- Remove all fasteners (screws, bolts, clips) holding the bumper cover in place. Note locations for reassembly.
- Carefully detach the bumper cover.
- Install the bumper cover aligning it correctly with the body.
- Reinstall all fasteners to specified torque specifications using the appropriate tools.
- Reconnect all sensors and wiring.
- Verify proper alignment and secure fit of bumper cover.
Rear Bumper Cover Removal and Installation
This procedure details how to remove and reinstall the rear bumper cover of a 2019+ BMW 340i, ensuring all fasteners are torqued to the correct specifications.
- Disconnect any sensors or wiring attached to the bumper cover.
- Remove all fasteners (screws, bolts, clips) holding the bumper cover in place. Note locations for reassembly.
- Carefully detach the bumper cover.
- Install the bumper cover aligning it correctly with the body.
- Reinstall all fasteners to specified torque specifications using the appropriate tools.
- Reconnect all sensors and wiring.
- Verify proper alignment and secure fit of bumper cover.
Front Fender Removal and Installation
This procedure outlines the steps for removing and reinstalling the front fenders, ensuring accurate torque is applied to all bolts.
- Open the door for access to fender bolts.
- Remove inner fender liner fasteners for access to hidden bolts
- Remove all fasteners (bolts, screws) securing the fender to the body and associated components.
- Carefully detach the fender.
- Align new fender with mounting points.
- Install the fender. Hand tighten bolts then torque to spec.
- Reinstall all fasteners to specified torque specifications using the appropriate tools.
- Reinstall the inner fender liner and secure all fasteners.
- Verify fender alignment with hood and door.
Body Panel Bolt Torque Inspection
This procedure outlines how to check all exterior body panel fasteners for proper torque.
- Locate all body panel fasteners including bumper, fender, door, and quarter panel bolts.
- Using the correct torque wrench and socket, verify the torque of each fastener against the vehicle specification.
- Retorque fasteners that are below the torque specifications.
- Note any fasteners with damaged or loose threads.
- Replace any damaged hardware and retorque
- Visually inspect all panels after completion.
Technical Service Bulletins
Corrosion Issues on Body Panel Fasteners
2021-05-15Some 2019-2020 BMW 340i models have experienced premature corrosion of body panel fasteners, particularly in regions with high salt usage during winter.
Resolution: Inspect all body panel fasteners for corrosion. Replace corroded fasteners with updated, corrosion-resistant hardware. Apply anti-seize compound to threads before installation. Confirm proper torque specifications during reassembly.
Bumper Cover Alignment Issues Post Repair
2022-11-20Reports of misaligned bumper covers, particularly after minor accidents or repairs, have been reported for 2019-2022 BMW 340i models. Misaligned fasteners may be contributing to this issue.
Resolution: Thoroughly inspect the bumper cover mounting points for damage or bending. Ensure all fasteners are correctly positioned and torqued to the manufacturer's specifications. Check alignment of bumper cover before securing all fasteners. If misalignment persists, consult body shop manual.
Fender Bolt Loosening Due to Vibration
2023-07-01Certain 2021-2023 BMW 340i models have exhibited loosening of fender bolts, possibly caused by excessive vibration. A periodic check of bolt torque is recommended.
Resolution: Inspect the torque of all fender bolts during routine maintenance, especially those in proximity to the engine. Re-torque to manufacturer specifications. Apply thread locking compound to bolts for added security.
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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.
- 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.