Buick Regal 2011-2017 2.4L Engine Bolt Torque Specifications
Comprehensive list of torque specifications for various bolts on the 2.4L engine of the 2011-2017 Buick Regal, including cylinder head, main bearing, and connecting rod bolts.
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
Specifications for fasteners related to the cylinder head and valve cover. Proper torque is critical for head gasket sealing and preventing oil leaks.
1 Cylinder Head Bolts (Long)
M12 x 1.75
Cylinder Head Bolts (Long)
M12 x 1.75Important Notes
2 Cylinder Head Bolts (Short)
M12 x 1.75
Cylinder Head Bolts (Short)
M12 x 1.75Important Notes
3 Cylinder Head Cover Bolts
M6 x 1
Cylinder Head Cover Bolts
M6 x 1Torque Value
Important Notes
Intake And Exhaust
Specifications for fasteners related to the intake and exhaust manifolds. Correct torque is essential for preventing leaks.
1 Intake Manifold Bolts
M8 x 1.25
Intake Manifold Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Manifold Bolts
M10 x 1.5
Exhaust Manifold Bolts
M10 x 1.5Torque Value
Important Notes
3 Exhaust Manifold Studs
M8 x 1.25
Exhaust Manifold Studs
M8 x 1.25Torque Value
Important Notes
4 Exhaust Manifold-to-Downpipe Flange Nuts
M10 x 1.5
Exhaust Manifold-to-Downpipe Flange Nuts
M10 x 1.5Torque Value
Important Notes
Engine Internals
Torque specifications for critical internal engine components. Accurate torque is crucial for engine reliability and performance. *Always use new bolts where specified.*
1 Connecting Rod Bolts
M9 or M10 (Check markings, vary by manufacturer)
Connecting Rod Bolts
M9 or M10 (Check markings, vary by manufacturer)Important Notes
2 Main Bearing Cap Bolts
M10 x 1.5
Main Bearing Cap Bolts
M10 x 1.5Important Notes
3 Oil Pan Bolts
M6 x 1
Oil Pan Bolts
M6 x 1Torque Value
Important Notes
4 Oil Pump Bolts
M6 x 1
Oil Pump Bolts
M6 x 1Torque Value
Important Notes
Cooling System
Specifications for fasteners related to the cooling system. Proper torque is essential for preventing coolant leaks.
1 Thermostat Housing Bolts
M6 x 1
Thermostat Housing Bolts
M6 x 1Torque Value
Important Notes
2 Water Pump Bolts
M6 x 1
Water Pump Bolts
M6 x 1Torque Value
Important Notes
Timing And Accessory Drive
Specifications for fasteners related to the timing components and accessory drive. Correct torque is vital for proper engine operation and component longevity. *Typically, one-time-use bolts should always be replaced.*
1 Crankshaft Pulley Bolt
M14 x 1.5
Crankshaft Pulley Bolt
M14 x 1.5Important Notes
2 Camshaft Sprocket Bolts
M10 x 1.25
Camshaft Sprocket Bolts
M10 x 1.25Important Notes
3 Timing Chain Tensioner Bolts
M6 x 1
Timing Chain Tensioner Bolts
M6 x 1Torque Value
Important Notes
4 Alternator Mounting Bolts
M10 x 1.5
Alternator Mounting Bolts
M10 x 1.5Torque Value
Important Notes
5 Starter Mounting Bolts
M10 x 1.5
Starter Mounting Bolts
M10 x 1.5Torque Value
Important Notes
Other Components
Specifications for other fasteners located on the engine.
1 Knock Sensor Bolt
M8x1.25
Knock Sensor Bolt
M8x1.25Torque 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?
Using the correct torque ensures that fasteners are neither too loose, which can cause parts to come apart or leak, nor too tight, which can damage threads, stretch bolts, or crush gaskets. For example, over-tightening cylinder head bolts could cause a blown head gasket, while under-tightening connecting rod bolts could lead to catastrophic engine failure.
Q2 What happens if I don't use a torque wrench?
What happens if I don't use a torque wrench?
Without a torque wrench, it's very difficult to apply consistent, accurate torque. You risk either under- or over-tightening fasteners. While you might be able to estimate, this can lead to component failure and is not recommended, especially for critical engine parts. For instance, improperly torqued camshaft bearing caps can cause excessive wear or binding of the camshaft.
Q3 Do I need to replace bolts when working on my 2.4L engine?
Do I need to replace bolts when working on my 2.4L engine?
Certain bolts, especially those subjected to high stress or torque-to-yield specifications (like cylinder head bolts), should be replaced upon removal. Reusing these bolts can lead to improper clamping force and potential failure. Always consult your repair manual for specific recommendations. For example, if you remove the connecting rod bolts, these are generally considered single-use and must be replaced.
Q4 What is 'torque-to-yield' and why is it different?
What is 'torque-to-yield' and why is it different?
Torque-to-yield (TTY) bolts are designed to stretch slightly when tightened, achieving a more precise clamping force. These bolts are designed for one-time use and should always be replaced if removed. TTY bolts may have torque specs that include angle-tightening past a specific torque value. Reusing TTY bolts can result in improper clamping force and lead to engine damage. Many fasteners on the 2.4L ecotec engine are not TTY, but you will need to consult the service manual.
Q5 How do I clean threads before reassembly?
How do I clean threads before reassembly?
Clean threads with a thread chaser or appropriate tap to remove any dirt, corrosion or debris. This ensures proper clamping force and prevents inaccurate torque readings. For example, if you're reassembling the engine block, clean the threads on all the main bearing cap bolt holes and the bolt threads themselves to assure proper torque is applied.
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 accurately tightening bolts to the specified torque values.
- Measures torque in ft-lbs or Nm
- Click-type or digital readout options
Torque Wrench (3/8-inch Drive)
A smaller torque wrench is useful for accessing tighter areas and applying lower torque values.
- Measures torque in ft-lbs or Nm
- Useful for smaller bolts and fasteners
Socket Set (Metric)
A complete set of metric sockets will be needed to match various bolt sizes on the 2.4L engine.
- Comprehensive range of sizes
- Various drive sizes (1/2-inch and 3/8-inch)
Socket Extensions
Extensions provide reach for fasteners in recessed locations.
- Various lengths available
- Allow access to hard-to-reach bolts
Universal Joint
A universal joint allows socket movement around obstructions.
- Swiveling action
- Facilitates access to angled fasteners
Service Procedures
Cylinder Head Bolt Tightening Procedure (2.4L)
Proper cylinder head bolt tightening sequence and torque are crucial for a proper seal and engine performance on the 2.4L engine. Always refer to a vehicle specific manual before commencing repair. This is a generalized overview.
- Clean all bolt threads and ensure they are free of debris.
- Apply a thin layer of engine oil to the bolt threads.
- Tighten all cylinder head bolts in the correct sequence to the first specified torque value.
- Continue tightening in the same sequence to the final specified torque value.
- Angle tighten if specified in workshop manual.
Intake Manifold Bolt Tightening Procedure (2.4L)
Correct torque is necessary for proper sealing of the intake manifold to prevent vacuum leaks on the 2.4L engine. Always refer to a vehicle specific manual before commencing repair. This is a generalized overview.
- Clean all bolt threads and mating surfaces.
- Install all manifold bolts finger tight.
- Tighten all bolts in the correct sequence to the specified torque value in multiple passes.
- Double check that all torques are correct
Exhaust Manifold Bolt Tightening Procedure (2.4L)
Properly tightening the exhaust manifold bolts prevents exhaust leaks on the 2.4L engine. Always refer to a vehicle specific manual before commencing repair. This is a generalized overview.
- Clean all bolt threads and mating surfaces.
- Install all manifold bolts finger tight.
- Tighten all bolts in the correct sequence to the specified torque value in multiple passes.
- Double check that all torques are correct.
Camshaft Bearing Cap Bolt Tightening Procedure (2.4L)
Proper torque of the camshaft bearing cap bolts is crucial for camshaft alignment and performance on the 2.4L engine. Always refer to a vehicle specific manual before commencing repair. This is a generalized overview.
- Clean all bolt threads and mating surfaces.
- Install all bearing cap bolts finger tight.
- Tighten all bolts in the correct sequence to the specified torque value in multiple passes.
- Double check that all torques are correct.
Technical Service Bulletins
Engine Oil Consumption - 2.4L
2016-05-15Some 2.4L engines may experience higher than normal oil consumption. This bulletin addresses potential causes and remedies.
Resolution: Check for excessive valve stem seal wear and/or piston ring failure. Replacement of these components may be necessary.
Timing Chain Tensioner Issues - 2.4L
2015-02-20A faulty timing chain tensioner can cause engine noise and potential timing issues on the 2.4L engines.
Resolution: Inspect the timing chain tensioner for wear or malfunction. Replace the tensioner if necessary.
High Pressure Fuel Pump Seal Leakage- 2.4L
2017-08-22Some 2.4L engines may develop a leak in the high pressure fuel pump.
Resolution: Replace the high pressure fuel pump with the updated version.
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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.