Acura CL 1997-1999 Drivetrain Bolt Torque Specifications
This page provides detailed torque specifications for various drivetrain bolts on the 1997-1999 Acura CL, including transmission, driveshaft, and differential components.
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
Drivetrain Flywheel Clutch
Torque specifications for components related to the flywheel and clutch assembly.
1 Flywheel Bolts
M10 x 1.25
Flywheel Bolts
M10 x 1.25Torque Value
Important Notes
2 Pressure Plate Bolts
M8 x 1.25
Pressure Plate Bolts
M8 x 1.25Important Notes
3 Clutch Slave Cylinder Bolts
M8 x 1.25
Clutch Slave Cylinder Bolts
M8 x 1.25Torque Value
Important Notes
Drivetrain Transmission
Torque specifications for components related to the transmission.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
3 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
4 Transmission Bell Housing Bolts
M12 x 1.75
Transmission Bell Housing Bolts
M12 x 1.75Torque Value
Important Notes
5 Shift Linkage Bolts
M8 x 1.25
Shift Linkage Bolts
M8 x 1.25Important Notes
6 Input Shaft Bearing Retainer Bolts
M8 x 1.25
Input Shaft Bearing Retainer Bolts
M8 x 1.25Important Notes
Drivetrain Axles Driveshaft
Torque specifications for components related to the drive axles and driveshaft.
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
M10 x 1.5
Propeller/Drive Shaft Bolts
M10 x 1.5Torque Value
Important Notes
Drivetrain Differential Transfer
Torque specifications for components related to the differential and transfer case.
1 Differential Drain/Fill Plug
M18 x 1.5
Differential Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
2 Transfer Case Drain/Fill Plug
M18 x 1.5
Transfer Case Drain/Fill Plug
M18 x 1.5Torque Value
Important Notes
3 Differential Mounting Bolts
M12 x 1.75
Differential 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 proper torque specifications important?
Why are proper torque specifications important?
Using the correct torque ensures that fasteners are tight enough to hold components securely without being overtightened, which can cause thread damage, fastener failure, or component distortion. For example, overtightening a driveshaft bolt can stretch the bolt and cause premature failure, potentially leading to a dangerous situation while driving.
Q2 What happens if I over-torque a bolt?
What happens if I over-torque a bolt?
Over-torquing can lead to stripping the threads in the bolt or the component it's threaded into, stretching the bolt, and potentially causing fatigue cracks and premature failure. This is a common issue with CV axle nuts, and a stripped thread could cause the axle to disengage while driving.
Q3 Can I reuse drivetrain bolts?
Can I reuse drivetrain bolts?
While some bolts can be reused, critical components like driveshaft and flywheel bolts are often 'torque-to-yield' and are designed to stretch upon proper installation. These bolts should always be replaced as they are designed for single use. Failure to do so can lead to loosening or failure under stress.
Q4 What type of torque wrench should I use?
What type of torque wrench should I use?
For drivetrain components, use a quality click-type or beam-type torque wrench that accurately measures torque within the range required for each bolt. It's best to use a torque wrench that has a rated range close to the values you'll be using to ensure accuracy. For example, use a lower-range torque wrench for smaller bolts and a high-range torque wrench for things like the flywheel bolts or axle nuts.
Q5 Do I need to use thread locker on drivetrain bolts?
Do I need to use thread locker on drivetrain bolts?
Some drivetrain bolts, particularly those that may be subject to vibration, require thread locker to prevent them from loosening over time. Consult your specific service manual for the application. Typically, flywheel bolts and certain transmission housing bolts should be installed with a medium-strength thread locker.
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 for applying precise torque values to fasteners.
- 10-150 ft-lb range
- Click-type mechanism
- Easy-to-read scale
Torque Wrench (3/8" Drive)
A smaller torque wrench for fasteners with lower torque specifications.
- 5-80 ft-lb range
- Click-type mechanism
- Compact design
Socket Set (Metric)
A set of metric sockets of various sizes to fit different fasteners on the drivetrain.
- 6-point sockets for secure grip
- Variety of sizes from 8mm to 24mm
- Durable construction
Extension Bars (1/2" and 3/8" Drive)
Extension bars to reach recessed or difficult-to-access fasteners.
- Various lengths (e.g., 3", 6", 10")
- Sturdy build
- Compatible with both 1/2" and 3/8" drives
Universal Joint (1/2" and 3/8" Drive)
A universal joint to allow access to fasteners at an angle.
- Allows for angled torque application
- Durable construction
- Compatible with both 1/2" and 3/8" drives
Service Procedures
Driveshaft Bolt Torque Procedure
Procedure for torquing the bolts that secure the driveshaft to the transmission and differential.
- Locate the driveshaft bolts.
- Clean the threads of the bolts and mating surfaces.
- Apply a thin layer of anti-seize compound to the bolt threads (optional, check service manual).
- Install the bolts by hand.
- Using the correct sized socket and torque wrench, tighten the bolts to 33 ft-lbs (45 Nm) in a star pattern.
- Double check torque values
Transmission Mount Bolt Torque Procedure
Procedure for torquing the bolts that secure the transmission mount to the vehicle's frame.
- Locate the transmission mount bolts.
- Clean the threads of the bolts and mating surfaces.
- Install the bolts by hand.
- Using the correct sized socket and torque wrench, tighten the mounting bolts to 40 ft-lbs (54 Nm)
- Tighten the through bolt to 47 ft-lbs (64 Nm)
- Double check torque values
Differential Housing Bolt Torque Procedure
Procedure for torquing the bolts that secure the differential housing.
- Locate the differential housing bolts.
- Clean the threads of the bolts and mating surfaces.
- Install the bolts by hand.
- Using the correct sized socket and torque wrench, tighten the bolts to 28 ft-lbs (38 Nm) in a star pattern.
- Double check torque values
Technical Service Bulletins
Driveshaft Bolt Loosening Issue
1998-05-15Some 1997-1999 Acura CL models have experienced driveshaft bolt loosening after initial torque application.
Resolution: Apply a thread-locking compound to the driveshaft bolts and tighten to the specified torque. Re-check torque after 500 miles
Transmission Mount Vibration
1999-01-20Some 1997-1999 Acura CL vehicles have reported increased vibration at idle or low speeds. This can sometimes be caused by loose or incorrectly torqued transmission mount bolts.
Resolution: Inspect all transmission mount bolts and re-torque to the specified values. Ensure the rubber mount is in good condition
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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.