Acura TSX 2009-2014 2.4L Engine Bolt Torque Specifications
Detailed torque specifications for various bolts on the 2.4L engine in the 2009-2014 Acura TSX, including cylinder head, connecting rod, main bearing, and other critical fasteners.
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 is a critical component of the engine, responsible for housing the valves and ensuring proper compression.
1 Cylinder Head Bolts
M12 x 1.5
Cylinder Head Bolts
M12 x 1.5Torque Value
2 Cylinder Head to Engine Block Studs
M14 x 1.5
Cylinder Head to Engine Block Studs
M14 x 1.5Torque Value
Important Notes
Engine Block
The engine block is the main structural component of the engine, housing the cylinders and crankshaft.
1 Main Bearing Bolts
M16 x 1.5
Main Bearing Bolts
M16 x 1.5Torque Value
2 Engine Block to Transmission Mounting Bolts
M14 x 1.5
Engine Block to Transmission Mounting Bolts
M14 x 1.5Torque Value
Important Notes
3 Engine Block to Engine Mounting Bolts
M14 x 1.5
Engine Block to Engine Mounting Bolts
M14 x 1.5Torque Value
Important Notes
Cylinder Head Components
The cylinder head components include the valve cover, rocker arms, and spark plugs.
1 Valve Cover Bolts
M10 x 1.5
Valve Cover Bolts
M10 x 1.5Torque Value
2 Rocker Arms/Shafts Bolts
M12 x 1.5
Rocker Arms/Shafts Bolts
M12 x 1.5Torque Value
3 Spark Plugs
M14 x 1.25
Spark Plugs
M14 x 1.25Torque Value
Engine Accessories
The engine accessories include the water pump, thermostat housing, and oil pan.
1 Water Pump Bolts
M10 x 1.5
Water Pump Bolts
M10 x 1.5Torque Value
2 Water Pump Pulley Bolts
M10 x 1.5
Water Pump Pulley Bolts
M10 x 1.5Torque Value
3 Thermostat Housing Bolts
M10 x 1.5
Thermostat Housing Bolts
M10 x 1.5Torque Value
4 Oil Pan Bolts
M12 x 1.5
Oil Pan Bolts
M12 x 1.5Torque Value
Timing System
The timing system includes the timing belt/chain tensioner, camshaft sprocket, and crankshaft position sensor.
1 Timing Belt/Chain Tensioner Bolt
M12 x 1.5
Timing Belt/Chain Tensioner Bolt
M12 x 1.5Torque Value
2 Camshaft Sprocket Bolt
M14 x 1.5
Camshaft Sprocket Bolt
M14 x 1.5Torque Value
3 Crankshaft Position Sensor Bolt
M10 x 1.5
Crankshaft Position Sensor Bolt
M10 x 1.5Torque Value
Important Notes
4 Camshaft Position Sensor Bolt
M10 x 1.5
Camshaft Position Sensor Bolt
M10 x 1.5Torque Value
Important Notes
Fuel System
The fuel system includes the fuel rail, fuel injectors, and throttle body.
1 Fuel Rail Bolts
M10 x 1.5
Fuel Rail Bolts
M10 x 1.5Torque Value
2 Fuel Injector Bolts
M10 x 1.5
Fuel Injector Bolts
M10 x 1.5Torque Value
3 Throttle Body Bolts
M12 x 1.5
Throttle Body Bolts
M12 x 1.5Torque Value
Exhaust System
The exhaust system includes the exhaust manifold/headers and EGR valve.
1 Exhaust Manifold/Headers Bolts
M12 x 1.5
Exhaust Manifold/Headers Bolts
M12 x 1.5Torque Value
2 EGR Valve Bolts
M12 x 1.5
EGR Valve Bolts
M12 x 1.5Torque Value
Ignition System
The ignition system includes the ignition coil and spark plugs.
1 Ignition Coil Bolt
M10 x 1.5
Ignition Coil Bolt
M10 x 1.5Torque Value
Crankshaft
The crankshaft is a critical component of the engine, responsible for converting the up-and-down motion of the pistons into rotary motion.
1 Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5
Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5Torque Value
2 Flywheel Bolts
M14 x 1.5
Flywheel Bolts
M14 x 1.5Torque Value
Connecting Rod
The connecting rod is a critical component of the engine, responsible for connecting the piston to the crankshaft.
1 Connecting Rod Nuts
M12 x 1.5
Connecting Rod Nuts
M12 x 1.5Torque Value
Oil System
The oil system includes the oil pan and oil drain plug.
1 Oil Drain Plug Bolt
M14 x 1.5
Oil Drain Plug Bolt
M14 x 1.5Torque Value
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 using the correct torque specifications important?
Why is using the correct torque specifications important?
Using the correct torque specifications is crucial to ensure proper sealing, prevent leaks, and avoid damaging components. Over-tightening can strip threads or distort parts, while under-tightening can lead to loose bolts and potential engine damage. For example, an improperly torqued cylinder head bolt could cause a blown head gasket.
Q2 Do I need to use new bolts when reassembling components?
Do I need to use new bolts when reassembling components?
In some cases, yes. Torque-to-yield (TTY) bolts, often used in cylinder heads and connecting rods, are designed to stretch when tightened and must be replaced. Refer to the service manual for bolt identification. Reuse of TTY bolts could result in reduced clamping force and component failure. For example, reusing cylinder head bolts can cause head gasket leaks or engine damage.
Q3 What type of lubricant should I use on bolts?
What type of lubricant should I use on bolts?
The type of lubricant, if any, depends on the specific application. Generally, engine oil is used for most internal engine bolts. However, some bolts might specify dry assembly or a special anti-seize compound. Using an incorrect lubricant can alter the clamping force achieved at a given torque setting. For example, using anti-seize on a bolt designed for dry assembly will lead to over tightening.
Q4 What is the correct tightening sequence for the cylinder head bolts?
What is the correct tightening sequence for the cylinder head bolts?
The cylinder head bolts should always be tightened in a specific sequence, usually starting from the center and working outwards in a spiral or cross pattern. This ensures even clamping force across the head gasket. Consult the service manual for the exact sequence for the 2.4L engine. Failing to follow this sequence will cause the head to warp, create leaks, and reduce engine performance.
Q5 Can I use an impact wrench to tighten bolts to their specified torque?
Can I use an impact wrench to tighten bolts to their specified torque?
No, an impact wrench should not be used to tighten bolts to their final torque specification. They are best used for initial loosening and tightening. Use a calibrated torque wrench for the final tightening to ensure accuracy. Using an impact wrench could easily over-torque the bolt and damage it or associated parts, for example, snapping an intake manifold bolt when tightening.
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 accurate bolt tightening.
- 1/2 inch drive for common bolt sizes
- Wide torque range (e.g., 10-150 ft-lbs)
- Click-type or digital
Torque Wrench (3/8 inch drive)
A calibrated torque wrench is essential for accurate bolt tightening.
- 3/8 inch drive for smaller bolts
- Lower torque range (e.g., 5-80 ft-lbs)
- Click-type or digital
Socket Set (Metric)
A comprehensive set of metric sockets to fit various bolt and nut sizes on the 2.4L engine.
- Variety of sizes from 8mm to 19mm
- 6-point design for secure grip
- Deep and shallow sockets
Socket Extensions
Extensions of various lengths to access recessed bolts.
- 3 inch extension
- 6 inch extension
- 10 inch extension
Universal Joint Adapter
Adapters to reach bolts at angles.
- 3/8" and 1/2" drives
- Various angles
Service Procedures
Cylinder Head Bolt Tightening Sequence
Properly tightening the cylinder head bolts in the correct sequence is crucial for head gasket seal.
- 1. Clean threads on block and bolts.
- 2. Apply engine oil to threads and under bolt head.
- 3. Tighten all bolts to 22 ft-lbs in sequence.
- 4. Tighten all bolts to 51 ft-lbs in sequence.
- 5. Rotate all bolts 90 degrees in sequence.
- 6. Rotate all bolts 90 degrees in sequence.
Intake Manifold Bolt Tightening
Tightening the intake manifold bolts to specification to prevent vacuum leaks.
- 1. Install all bolts finger tight.
- 2. Tighten all bolts to 16 ft-lbs in a crisscross pattern.
- 3. Check for proper seal.
Exhaust Manifold Bolt Tightening
Tightening the exhaust manifold bolts to specification.
- 1. Install all bolts finger tight.
- 2. Tighten all bolts to 23 ft-lbs in a crisscross pattern.
- 3. Check for proper seal.
Camshaft Cap Bolt Tightening
Tightening the camshaft cap bolts to specification
- 1. Install all bolts finger tight.
- 2. Tighten all bolts to 15 ft-lbs in sequence.
Rocker Arm Assembly Bolt Tightening
Tightening the rocker arm bolts to specification
- 1. Install all bolts finger tight.
- 2. Tighten all bolts to 16 ft-lbs.
Oil Pan Bolt Tightening
Tightening the oil pan bolts to specification to prevent oil leaks.
- 1. Install all bolts finger tight.
- 2. Tighten all bolts to 10 ft-lbs in a crisscross pattern.
Connecting Rod Bolt Tightening
Tightening the connecting rod bolts in sequence to specification.
- 1. Clean threads on rods and bolts.
- 2. Apply engine oil to threads and under bolt head.
- 3. Tighten bolts to 22 ft-lbs.
- 4. Rotate all bolts 90 degrees.
Crankshaft Main Bearing Cap Bolt Tightening
Tightening the main bearing bolts in sequence to specification.
- 1. Clean threads on block and bolts.
- 2. Apply engine oil to threads and under bolt head.
- 3. Tighten inner bolts to 22 ft-lbs.
- 4. Tighten outer bolts to 16 ft-lbs.
- 5. Rotate all inner bolts 90 degrees.
- 6. Rotate all outer bolts 45 degrees.
Technical Service Bulletins
Excessive Oil Consumption on 2.4L Engines
2012-05-15Some 2009-2014 TSX models equipped with the 2.4L engine may experience excessive oil consumption. This bulletin outlines diagnostic and repair procedures.
Resolution: Perform piston ring inspection and replacement if needed, adjust valve lash, and ensure proper PCV valve operation.
Timing Chain Tensioner Noise on 2.4L Engines
2013-02-28Some 2009-2014 TSX models with 2.4L engines may exhibit a rattling noise from the timing chain area. This bulletin addresses the issue related to the timing chain tensioner.
Resolution: Inspect and replace the timing chain tensioner as necessary and verify correct timing chain alignment.
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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.
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