Buick Enclave 2008-2017 Drivetrain Bolt Torque Specifications
Comprehensive list of torque specifications for drivetrain bolts on the 2008-2017 Buick Enclave, covering various components such as axles, transmission, and differential.
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
Engine Flywheel
Components involved in transferring rotational force from the engine to the transmission, including the flywheel (manual transmission) or flexplate (automatic transmission), and torque converter.
1 Flywheel Bolts
M12 x 1.25
Flywheel Bolts
M12 x 1.25Torque Value
Important Notes
2 Torque Converter Bolts to Flexplate
M10 x 1.25
Torque Converter Bolts to Flexplate
M10 x 1.25Torque Value
Important Notes
Transmission Mounting
Components related to securing the transmission to the engine and/or vehicle chassis.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Output Shaft Flange Bolt
M10 x 1.5
Transmission Output Shaft Flange Bolt
M10 x 1.5Torque Value
Important Notes
Transmission Service
Bolts and plugs used during transmission fluid service and maintenance.
1 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
Driveshaft And Axles
Components related to the driveshaft, drive axles and CV joints.
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
Drive Axle/Half Shaft Bolts
M10 x 1.5Torque Value
Important Notes
2 CV Joint/Axle Nut
M24 x 1.5
CV Joint/Axle Nut
M24 x 1.5Torque Value
Important Notes
3 Propeller/Drive Shaft Bolts
M8 x 1.25
Propeller/Drive Shaft Bolts
M8 x 1.25Torque Value
Important Notes
4 Driveshaft Center Support Bearing Bolts
M10 x 1.5
Driveshaft Center Support Bearing Bolts
M10 x 1.5Torque Value
Important Notes
Differential
Components related to the differential including ring gear, carrier bearings, and fill/drain plugs.
1 Differential Drain/Fill Plug
M18 x 1.5
Differential Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
2 Differential Ring Gear Bolts
M12 x 1.25
Differential Ring Gear Bolts
M12 x 1.25Torque Value
Important Notes
3 Differential Carrier Bearing Cap Bolts
M12 x 1.75
Differential Carrier Bearing Cap Bolts
M12 x 1.75Torque Value
Important Notes
Transfer Case
Components specific to the transfer case used in four-wheel-drive vehicles.
1 Transfer Case Drain/Fill Plug
M18 x 1.5
Transfer Case Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
2 Transfer Case Mounting Bolts
M12 x 1.75
Transfer Case Mounting Bolts
M12 x 1.75Torque 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 are torque specifications important for drivetrain bolts?
Why are torque specifications important for drivetrain bolts?
Proper torque ensures bolts are neither too loose (leading to component failure, noise, or leaks) nor too tight (potentially causing bolt stretching, thread damage, or component cracking). Correct torque provides the clamping force necessary for secure and reliable drivetrain operation. For example, overtightening a driveshaft bolt could lead to premature bearing wear or even a fractured flange, while undertightening could cause the shaft to vibrate excessively and fail.
Q2 What happens if I overtighten a drivetrain bolt?
What happens if I overtighten a drivetrain bolt?
Overtightening can stretch or weaken the bolt, damage the threads in the component or nut, and put undue stress on the components being joined. This can lead to bolt failure, component failure, and potentially dangerous situations, such as a driveshaft separation. Additionally, warped flanges or housing damage is a risk.
Q3 What happens if I undertighten a drivetrain bolt?
What happens if I undertighten a drivetrain bolt?
Undertightened bolts can loosen over time due to vibrations and stress. This can lead to component movement, noises, leaks (e.g., from a transmission pan), and eventual failure. Loose bolts can also cause other drivetrain components to fail prematurely from added stress. For instance, a loose differential mounting bolt can cause excessive vibration and bearing failure.
Q4 Can I reuse drivetrain bolts?
Can I reuse drivetrain bolts?
It's generally recommended to replace critical drivetrain bolts, especially those that are torque-to-yield (TTY) or stretch bolts. TTY bolts are designed to stretch slightly when torqued and should never be reused, as they will not provide the same clamping force. Standard bolts can be reused if they are in good condition and free from damage, but using new bolts is best practice for critical drivetrain components.
Q5 What is the best way to apply torque?
What is the best way to apply torque?
Use a calibrated torque wrench and apply the torque in smooth, even motions. Avoid jerky movements. When tightening multiple bolts, use a star pattern or criss-cross method. Apply the torque in multiple stages, starting with a lower torque value and gradually increasing to the final specification. This helps to evenly distribute the load and prevent warping of components.
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 inch drive)
A calibrated torque wrench is essential for applying precise torque to fasteners.
- Wide torque range (typically 20-200 ft-lbs or more)
- Click-type or digital display
- Accurate and reliable
Torque Wrench (3/8 inch drive)
A smaller torque wrench for lower torque applications.
- Torque range typically from 5-80 ft-lbs
- Click-type or digital display
- Easy to handle in tight spaces
Socket Set (Metric)
A comprehensive set of metric sockets to fit various drivetrain bolts.
- Includes a range of common sizes (e.g., 10mm, 12mm, 13mm, 14mm, 15mm, 18mm, etc.)
- 6-point sockets for secure grip
- Durable construction
Socket Extensions and Universal Joint
To reach recessed or difficult-to-access bolts.
- Varying lengths
- Allows torque application at an angle
- Strong construction
Service Procedures
Driveshaft Bolt Torque Procedure
Procedure for torquing the bolts securing the driveshaft to the transmission and rear differential.
- Identify all driveshaft bolts.
- Clean all bolt threads with a wire brush to remove debris.
- Apply a small amount of anti-seize compound to bolt threads (optional).
- Install bolts finger tight.
- Torque bolts in a star pattern to specified value (typically 52 ft-lbs, verify with service manual).
- Double check torque.
- Inspect for proper torque and bolt condition after test drive
Transfer Case Bolt Torque Procedure
Procedure for torquing bolts securing the transfer case to the transmission and frame.
- Identify all transfer case mounting bolts.
- Clean all bolt threads with a wire brush to remove debris.
- Check for damaged or worn bolts and replace as needed
- Install bolts finger tight.
- Torque bolts in a star pattern to the first specified torque value (typically 25 ft-lbs, verify with service manual).
- Torque bolts in the same star pattern to the final specified torque value (typically 75 ft-lbs, verify with service manual).
- Double check torque.
- Inspect for proper torque and bolt condition after test drive.
Rear Differential Mounting Bolt Torque Procedure
Procedure for torquing bolts securing the rear differential to the frame.
- Identify all rear differential mounting bolts.
- Clean all bolt threads with a wire brush to remove debris.
- Install bolts finger tight.
- Torque bolts to specified value (Typically 75 ft-lbs, verify with service manual).
- Double check torque.
- Inspect for proper torque and bolt condition after test drive.
Wheel Hub/Bearing Torque Procedure
Procedure for torquing the bolts that secure the wheel hub/bearing assembly
- Identify all wheel hub/bearing mounting bolts.
- Clean all bolt threads with a wire brush to remove debris.
- Install bolts finger tight.
- Torque bolts to specified value (Typically 110 ft-lbs, verify with service manual).
- Double check torque.
- Inspect for proper torque and bolt condition after test drive.
Technical Service Bulletins
Driveshaft Bolt Noise and Vibration
2014-05-15Some vehicles may exhibit noise or vibration from the driveshaft. This may be caused by incorrect bolt torque.
Resolution: Verify driveshaft bolts are torqued to 52 ft-lbs. Inspect driveshaft components for damage.
Transfer Case Mounting Bolt Loosening
2016-11-20Reports of transfer case mounting bolts loosening over time, leading to noise and possible damage.
Resolution: Verify torque of transfer case bolts (25 ft-lbs first pass, 75 ft-lbs final) and replace if damaged. Use threadlocker if required.
Rear Differential Noise and Vibration
2012-08-01Some vehicles may exhibit noise or vibration from the rear differential due to improper bolt torque.
Resolution: Verify rear differential mounting bolts are torqued to 75 ft-lbs. Inspect for differential damage
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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.