Acura TLX 2015-2020 3.5L Engine Bolt Torque Specifications
Detailed torque specifications for various bolts on the 3.5L engine found in the 2015-2020 Acura TLX. Includes cylinder head, main bearing cap, connecting rod, 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 and valve train
Components that secure the cylinder head, valves, and related components.
1 Cylinder Head Bolts
M12 x 1.5
Cylinder Head Bolts
M12 x 1.5Torque Value
2 Valve Cover Bolts
M8 x 1.25
Valve Cover Bolts
M8 x 1.25Torque Value
3 Rocker Arms/Shafts Bolts
M10 x 1.5
Rocker Arms/Shafts Bolts
M10 x 1.5Torque Value
Engine block and main bearings
Components that secure the engine block and main bearings.
1 Main Bearing Bolts
M14 x 2.0
Main Bearing Bolts
M14 x 2.0Torque Value
2 Engine Block to Transmission Mounting Bolts
M12 x 1.75
Engine Block to Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
3 Engine Block to Engine Mounting Bolts
M12 x 1.75
Engine Block to Engine Mounting Bolts
M12 x 1.75Torque Value
Important Notes
Crankshaft and connecting rods
Components that secure the crankshaft and connecting rods.
1 Connecting Rod Nuts
M12 x 1.5
Connecting Rod Nuts
M12 x 1.5Torque Value
2 Flywheel Bolts
M14 x 2.0
Flywheel Bolts
M14 x 2.0Torque Value
3 Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 2.0
Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 2.0Torque Value
Timing and accessory components
Components that secure the timing belt or chain, and related accessories.
1 Timing Belt/Chain Tensioner Bolt
M10 x 1.5
Timing Belt/Chain Tensioner Bolt
M10 x 1.5Torque Value
2 Camshaft Sprocket Bolt
M12 x 1.75
Camshaft Sprocket Bolt
M12 x 1.75Torque Value
3 Water Pump Bolts
M10 x 1.5
Water Pump Bolts
M10 x 1.5Torque Value
4 Water Pump Pulley Bolts
M10 x 1.5
Water Pump Pulley Bolts
M10 x 1.5Torque Value
Intake and exhaust components
Components that secure the intake manifold, exhaust manifold, and related components.
1 Throttle Body Bolts
M8 x 1.25
Throttle Body Bolts
M8 x 1.25Torque Value
2 Intake Manifold Bolts
M10 x 1.5
Intake Manifold Bolts
M10 x 1.5Torque Value
3 Exhaust Manifold/Headers Bolts
M12 x 1.75
Exhaust Manifold/Headers Bolts
M12 x 1.75Torque Value
Fuel and ignition components
Components that secure the fuel rail, fuel injectors, and ignition coil.
1 Fuel Rail Bolts
M8 x 1.25
Fuel Rail Bolts
M8 x 1.25Torque Value
2 Fuel Injector Bolts
M6 x 1.0
Fuel Injector Bolts
M6 x 1.0Torque Value
3 Ignition Coil Bolt
M8 x 1.25
Ignition Coil Bolt
M8 x 1.25Torque Value
Oil and cooling components
Components that secure the oil pan, oil filter housing, and thermostat housing.
1 Oil Pan Bolts
M10 x 1.5
Oil Pan Bolts
M10 x 1.5Torque Value
Important Notes
2 Oil Filter Housing Bolt
M12 x 1.75
Oil Filter Housing Bolt
M12 x 1.75Torque Value
3 Thermostat Housing Bolts
M10 x 1.5
Thermostat Housing Bolts
M10 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 are torque specifications important for my Acura TLX's 3.5L engine?
Why are torque specifications important for my Acura TLX's 3.5L engine?
Correct torque specifications ensure proper clamping force between components, preventing leaks, component failure, and engine damage. Over-tightening can strip threads or cause component warping, while under-tightening can lead to leaks and loosening over time. For example, improper torque on cylinder head bolts can lead to head gasket failure, coolant leaks, and engine overheating.
Q2 What happens if I don't use a torque wrench?
What happens if I don't use a torque wrench?
Using a torque wrench is crucial for applying the correct amount of force. Without one, it's difficult to judge the tightness accurately. 'Hand tight' is not sufficient for most engine components. Guesswork can easily lead to over- or under-torquing. For example, over tightening a intake manifold bolt could lead to cracking or damaging the intake manifold and under torquing can lead to vacuum leaks and poor engine performance.
Q3 Should I use new bolts when reassembling engine components?
Should I use new bolts when reassembling engine components?
Yes, for critical components, especially those with torque-to-yield designs (e.g., cylinder head bolts), new bolts are highly recommended. Reusing bolts can lead to inaccurate torque readings and potential failure due to stretching or material fatigue. For example, using old cylinder head bolts might lead to head gasket failure even with correct torque procedure.
Q4 Are torque specifications the same for all 3.5L V6 engines in Acura vehicles?
Are torque specifications the same for all 3.5L V6 engines in Acura vehicles?
While many torque specifications might be similar across Acura's 3.5L V6 variants, there can be slight differences based on the year and model. Always refer to the specific repair manual for your 2015-2020 Acura TLX 3.5L engine to ensure accurate torque application. Variations may exist due to minor design changes and different supporting component.
Q5 What do 'Nm' and 'ft-lbs' mean in torque specifications?
What do 'Nm' and 'ft-lbs' mean in torque specifications?
'Nm' stands for Newton-meters, which is the metric unit of torque. 'ft-lbs' stands for foot-pounds, the imperial unit of torque. Always use the unit specified in the repair manual. Conversion between these two units is necessary if your torque wrench is not in the recommended units. If not, using a incorrect torque wrench can lead to incorrect results. For example, If you use foot-pounds where newton-meters was specified this can be a big difference and can lead to over or under tightening your 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 inch drive)
A calibrated torque wrench is essential for applying precise torque values to engine bolts. A 1/2 inch drive is recommended for the torque ranges required for this engine.
- Adjustable torque settings
- Click-type or digital display
- 1/2 inch drive compatibility
Torque Wrench (3/8 inch drive)
A smaller 3/8 inch drive torque wrench can be useful for lower torque applications within the engine bay.
- Adjustable torque settings
- Click-type or digital display
- 3/8 inch drive compatibility
Socket Set (Metric)
A comprehensive metric socket set is needed to fit various bolt heads on the 3.5L engine.
- Various sizes (8mm-19mm, and possibly larger)
- 6-point sockets preferred
- Deep and shallow sockets
Socket Extensions
Socket extensions of varying lengths are needed for accessing bolts in hard-to-reach areas.
- Various lengths
- Durable construction
- Compatible with 1/2 inch and 3/8 inch drive
Universal Joint
A universal joint, or wobble extension, is useful for accessing bolts at an angle.
- Swiveling action
- Durable construction
- Compatible with socket set
Service Procedures
Cylinder Head Bolt Torque Procedure (3.5L)
Detailed procedure for tightening cylinder head bolts on the 3.5L engine. This requires a specific sequence and multiple steps to ensure proper clamping force.
- Clean all bolt holes in the engine block and cylinder head thoroughly.
- Apply a light coat of engine oil to the bolt threads and underside of the bolt heads.
- Install all cylinder head bolts by hand, and torque them in a specific sequence to the first torque specification (typically 29 ft-lbs).
- Re-torque to the second specification (typically 61 ft-lbs), following the same sequence.
- Perform an angle-torque procedure following the same sequence of bolts, typically an additional 90 degrees, and then an additional 90 degrees.
- Double-check the torque on all bolts after completing the process.
Intake Manifold Bolt Torque Procedure (3.5L)
Detailed procedure for tightening the intake manifold bolts on the 3.5L engine.
- Install all intake manifold bolts by hand.
- Torque intake manifold bolts to the specified value (typically 16 ft-lbs), in the specified sequence.
- Double check all torques to make sure they are correct.
Main Bearing Cap Bolt Torque Procedure (3.5L)
Detailed procedure for tightening main bearing cap bolts on the 3.5L engine.
- Apply a light coat of engine oil to the bolt threads and underside of the bolt heads.
- Install all main bearing cap bolts by hand.
- Torque the bolts to the specified torque (typically 29 ft-lbs) following the correct sequence.
- Tighten to the next step by adding the specific angle (typically 90 degrees) following the same sequence.
- Double check all torques to make sure they are correct.
Connecting Rod Cap Bolt Torque Procedure (3.5L)
Detailed procedure for tightening connecting rod cap bolts on the 3.5L engine.
- Apply a light coat of engine oil to the bolt threads and underside of the bolt heads.
- Install all connecting rod bolts by hand.
- Torque the bolts to the specified torque (typically 16 ft-lbs) following the correct sequence.
- Tighten to the next step by adding the specific angle (typically 90 degrees) following the same sequence.
- Double check all torques to make sure they are correct.
Technical Service Bulletins
Engine Noise After Cylinder Head Work
2017-03-15Some 2015-2017 Acura TLX models with the 3.5L engine may experience unusual engine noises after cylinder head service if the head bolts were not torqued properly or in the correct sequence. These noises typically include a 'knocking' or 'ticking' sound.
Resolution: Re-torque cylinder head bolts to manufacturer specifications, using the correct tightening sequence, and ensuring angle torquing is achieved, if specified. Replace bolts if any damage is found.
Oil Leak from Oil Pan
2018-11-01Some 2016-2019 Acura TLX models with the 3.5L engine may experience oil leaks from the oil pan due to uneven torque on the bolts during reinstallation. This may occur if the bolts were not torqued in the correct pattern or were tightened too much.
Resolution: Clean mating surfaces thoroughly. Inspect the oil pan gasket. Apply a thin coat of sealant if specified. Re-torque the oil pan bolts in the specified sequence to the correct torque, avoiding over-tightening.
Intake Manifold Vacuum Leak
2020-05-20A vacuum leak may be present in 2018-2020 models around the intake manifold. Ensure bolts are torqued correctly to seal properly.
Resolution: Check the intake manifold for cracks or damage. Reinstall and tighten to spec in the correct sequence.
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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.