Acura Integra 1985-1989 1.6L Engine Bolt Torque Specifications
This page provides detailed torque specifications for various bolts on the 1.6L engine found in the 1985-1989 Acura Integra, covering crucial components for engine assembly and maintenance.
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
Cylinder Head
The cylinder head assembly includes the cylinder head, valve train components, and related fasteners. Proper torque ensures sealing of combustion chambers, coolant, and oil passages.
1 Cylinder Head Bolts
M10 x 1.25
Cylinder Head Bolts
M10 x 1.25Important Notes
2 Valve Cover Bolts
M6 x 1.0
Valve Cover Bolts
M6 x 1.0Torque Value
Important Notes
Crankshaft And Main Bearings
Components in this subsystem include the crankshaft, main bearing caps, and related fasteners. Proper torque ensures secure mounting of the crankshaft and prevents bearing failure.
1 Main Bearing Bolts
M12 x 1.5
Main Bearing Bolts
M12 x 1.5Important Notes
2 Flywheel Bolts
M10 x 1.25
Flywheel Bolts
M10 x 1.25Torque Value
Important Notes
Connecting Rods
This subsystem includes the connecting rods and their fasteners. Proper torque ensures secure attachment to the crankshaft and prevents bearing failure.
1 Connecting Rod Nuts
M8 x 1.0
Connecting Rod Nuts
M8 x 1.0Torque Value
Important Notes
Oil System
This subsystem includes the oil pan, oil pump, and related fasteners. Proper torque ensures leak-free operation and proper lubrication.
1 Oil Pan Bolts
M6 x 1.0
Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
2 Oil Pump Bolts
M8 x 1.0
Oil Pump Bolts
M8 x 1.0Torque Value
Important Notes
Timing System
This subsystem includes the timing belt/chain, tensioner, and related fasteners. Proper torque ensures accurate engine timing.
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.0
Timing Belt/Chain Tensioner Bolt
M8 x 1.0Torque Value
Important Notes
2 Camshaft Sprocket Bolt
M10 x 1.25
Camshaft Sprocket Bolt
M10 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 are torque specifications important?
Why are torque specifications important?
Torque specifications ensure proper clamping force between bolted parts. Too little torque can cause loosening and leaks, while too much can damage threads, distort parts, or cause bolt failure. For instance, overtightening a cylinder head bolt can warp the head, leading to leaks and engine damage. Following the specific torque specs for the 1.6L engine of your 1985-1989 Integra ensures optimal engine performance and longevity.
Q2 What type of torque wrench should I use?
What type of torque wrench should I use?
It's highly recommended to use a calibrated click-type torque wrench. This type of wrench provides an audible 'click' when the set torque value is reached, helping to prevent over-tightening. Beam-type torque wrenches are also acceptable, but require more attention to reading the torque value. Avoid using impact wrenches for final tightening as they can easily overtighten bolts and damage components.
Q3 Do I need to use new bolts each time?
Do I need to use new bolts each time?
While not always required for every bolt, it's generally a good practice to use new bolts for critical components, especially those that have undergone significant stress or are 'torque-to-yield' types (like some cylinder head bolts). For the 1.6L Integra engine, consider replacing bolts in locations such as the cylinder head, connecting rods, and main bearing caps to ensure proper clamping and avoid future failure due to bolt stretching or wear.
Q4 What if I don't have a torque specification?
What if I don't have a torque specification?
Always consult a reliable service manual specific to your 1985-1989 Acura Integra for torque specifications. If a specific torque spec is missing, it's best to err on the side of under-tightening and follow the manufacturer's recommendation for a similar-sized bolt, but note that this is a temporary solution. A general bolt torque chart might be helpful but is not a replacement for factory specs. For example, using a chart will not tell you that you need to use torque angle after a certain torque spec on the head bolts.
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 accurate bolt tightening.
- Click-type or digital
- Range: 10-150 ft-lbs (or equivalent in Nm)
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque applications.
- Click-type or digital
- Range: 5-80 ft-lbs (or equivalent in Nm)
Socket Set (Metric)
A comprehensive metric socket set to fit all the bolts on the engine.
- Various sizes: 8mm, 10mm, 12mm, 14mm, 17mm, 19mm, etc.
- Both shallow and deep sockets
Extension Bars
Used to reach bolts in hard to access locations.
- Various lengths (3", 6", 10")
- Both 1/2" and 3/8" drive sizes
Service Procedures
Cylinder Head Bolt Tightening
Proper tightening sequence and torque values for cylinder head bolts. This is a critical step to ensure proper sealing and engine operation.
- 1. Lightly lubricate the bolt threads with engine oil.
- 2. Install all cylinder head bolts by hand, ensuring they are fully threaded.
- 3. Tighten all bolts in sequence to 25 ft-lbs (34 Nm) using a 3/8" drive torque wrench.
- 4. Tighten all bolts in the same sequence to 49 ft-lbs (66 Nm).
- 5. Angle tighten an additional 90 degrees in sequence. Use a torque angle gauge for accurate measurement.
Intake Manifold Bolt Tightening
Proper tightening sequence and torque values for the intake manifold. Ensures a proper seal for proper airflow.
- 1. Install all intake manifold bolts by hand.
- 2. Tighten the bolts in a criss-cross pattern to 16 ft-lbs (22 Nm) using a 3/8" drive torque wrench.
Exhaust Manifold Bolt Tightening
Proper tightening sequence and torque values for the exhaust manifold. Ensures a tight seal to avoid exhaust leaks.
- 1. Install all exhaust manifold bolts by hand.
- 2. Tighten all bolts in a criss-cross pattern to 23 ft-lbs (31 Nm) using a 3/8" drive torque wrench.
Main Bearing Cap Bolt Tightening
Proper tightening sequence and torque values for the main bearing caps. This is critical for crankshaft support and performance
- 1. Apply light engine oil to main bearing cap bolts.
- 2. Install main bearing cap bolts by hand.
- 3. Tighten all main bearing bolts in a criss cross pattern to 20 ft-lbs (27 Nm) using a 1/2" drive torque wrench.
- 4. Tighten all main bearing bolts again in the same pattern to 42 ft-lbs (57 Nm).
- 5. Angle tighten an additional 90 degrees in sequence. Use a torque angle gauge for accurate measurement.
Connecting Rod Bolt Tightening
Proper tightening procedure and torque values for the connecting rod bolts. This ensures proper bearing function.
- 1. Apply light engine oil to the connecting rod bolts.
- 2. Install the connecting rod bolts by hand.
- 3. Tighten all connecting rod bolts to 14 ft-lbs (19 Nm) using a 3/8" drive torque wrench.
- 4. Angle tighten an additional 60 degrees in sequence. Use a torque angle gauge for accurate measurement.
Technical Service Bulletins
Cylinder Head Bolt Re-torque Procedure
1987-05-15Bulletin regarding potential cylinder head bolt loosening after initial installation and break-in period. Requires retorquing procedure after 500-1000 miles.
Resolution: Re-torque cylinder head bolts to specified values after a break-in period of 500-1000 miles.
Intake Manifold Gasket Leakage
1988-11-01Bulletin regarding potential intake manifold leaks due to improper torque or gasket degradation. Specific torque value review.
Resolution: Ensure proper tightening of intake manifold bolts to 16 ft-lbs (22 Nm). Inspect and replace the intake manifold gasket when necessary. Use a new gasket during installation.
Connecting Rod Bolt Inspection
1989-02-20Bulletin regarding potential connecting rod bolt stretching or failure due to over torque or age. Required inspection and or replacement
Resolution: Inspect connecting rod bolts for stretching or signs of fatigue. Replace connecting rod bolts when signs of issues are present. Always replace rod bolts if loosened.
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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.