Buick Verano 2012-2017 2.4L Engine Bolt Torque Specifications
Comprehensive list of torque specifications for various bolts on the 2.4L engine used in the 2012-2017 Buick Verano. Includes cylinder head, main bearing cap, connecting rod, intake manifold, exhaust manifold, and other critical engine bolt torques.
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
Torque specifications for fasteners related to the cylinder head, including bolts for mounting the head, camshaft bearing caps, and valve cover.
1 Cylinder Head Bolts
M10 x 1.5
Cylinder Head Bolts
M10 x 1.5Important Notes
2 Camshaft Bearing Cap Bolts
M6 x 1.0
Camshaft Bearing Cap Bolts
M6 x 1.0Torque Value
Important Notes
3 Valve Cover Bolts
M6 x 1.0
Valve Cover Bolts
M6 x 1.0Torque Value
Important Notes
Engine Block Internals
Torque specifications for fasteners related to the engine block, including connecting rod bolts, main bearing cap bolts, oil pan, and oil pump bolts.
1 Connecting Rod Bolts
M9 x 1.25
Connecting Rod Bolts
M9 x 1.25Important 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 1.0
Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
4 Oil Pump Bolts
M6 x 1.0
Oil Pump Bolts
M6 x 1.0Torque Value
Important Notes
Intake Exhaust
Torque specifications for fasteners related to the intake and exhaust systems, including the intake manifold, exhaust manifold, and exhaust downpipe.
1 Intake Manifold Bolts
M8 x 1.25
Intake Manifold Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Manifold Bolts
M8 x 1.25
Exhaust Manifold Bolts
M8 x 1.25Torque Value
Important Notes
3 Exhaust Downpipe Bolts
M10 x 1.5
Exhaust Downpipe Bolts
M10 x 1.5Torque Value
Important Notes
Cooling System
Torque specifications for fasteners related to the cooling system, including the water pump and thermostat housing.
1 Water Pump Bolts
M6 x 1.0
Water Pump Bolts
M6 x 1.0Torque Value
Important Notes
2 Thermostat Housing Bolts
M6 x 1.0
Thermostat Housing Bolts
M6 x 1.0Torque Value
Important Notes
Engine Accessories
Torque specifications for fasteners related to engine accessories, including the starter, alternator, and AC compressor.
1 Starter Bolts
M10 x 1.5
Starter Bolts
M10 x 1.5Torque Value
Important Notes
2 Alternator Mounting Bolts
M10 x 1.5
Alternator Mounting Bolts
M10 x 1.5Torque Value
Important Notes
3 AC Compressor Mounting Bolts
M8 x 1.25
AC Compressor Mounting Bolts
M8 x 1.25Torque Value
Important Notes
Timing System
Torque specifications for fasteners related to the timing system, including the timing chain tensioner and timing chain cover.
1 Timing Chain Tensioner Bolt
M8 x 1.25
Timing Chain Tensioner Bolt
M8 x 1.25Torque Value
Important Notes
2 Timing Chain Cover Bolts
M6 x 1.0
Timing Chain Cover Bolts
M6 x 1.0Torque 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?
Proper torque ensures bolts are tight enough to securely hold components together without over-tightening, which can lead to stripping threads, bolt breakage, or gasket failure. Under-tightening can result in leaks or component detachment. For example, improper torque on the cylinder head bolts can cause head gasket failure and severe engine damage.
Q2 What happens if I overtighten a bolt?
What happens if I overtighten a bolt?
Overtightening a bolt can stretch or break it, potentially damaging the threads in the receiving component. This leads to component failure and potentially costly repairs. Consider the intake manifold; if overtightened, it could crack, leading to a vacuum leak.
Q3 What happens if I under-tighten a bolt?
What happens if I under-tighten a bolt?
Under-tightening can cause components to loosen or detach due to vibration and stress, leading to leaks, component misalignment, and potential failure. For example, if the exhaust manifold bolts are undertightened, exhaust leaks and potentially damaged exhaust components can result.
Q4 Do I need to use new bolts?
Do I need to use new bolts?
In some cases, yes. Torque-to-yield (TTY) bolts are designed to stretch when tightened and are single-use. Examples include cylinder head bolts on the 2.4L engine. Always refer to the service manual; re-using TTY bolts will result in improper torque and clamping force.
Q5 What does 'Nm' mean in torque specifications?
What does 'Nm' mean in torque specifications?
Nm stands for Newton-meters, which is the standard unit of torque used internationally and often found in service manuals. It represents the rotational force applied to a bolt.
Q6 What is the purpose of a torque wrench?
What is the purpose of a torque wrench?
A torque wrench allows you to apply a specific amount of force (torque) to a fastener, ensuring accurate tightening to the manufacturer's specifications. Using a regular wrench without a torque wrench can easily lead to over or under-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 with a 1/2-inch drive is essential for applying accurate torque to engine bolts.
- Click-type or digital display
- Wide torque range to cover all specifications
Torque Wrench (3/8-inch Drive)
A calibrated torque wrench with a 3/8-inch drive is useful for smaller bolts and areas with limited space.
- Click-type or digital display
- Lower torque range for smaller fasteners
Socket Set (Standard & Metric)
A comprehensive socket set is necessary to fit the various bolt and nut sizes on the 2.4L engine.
- Standard and metric sizes
- Deep and shallow sockets
Socket Extensions
Socket extensions of various lengths aid in reaching recessed fasteners.
- Various lengths
- Durable construction
Universal Joint
A universal joint enables access to fasteners at awkward angles.
- Allows for angled operation
- Durable construction
Service Procedures
Cylinder Head Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the cylinder head bolts on the 2.4L engine.
- Clean all threads of bolts and the cylinder block.
- Install cylinder head and hand tighten all bolts.
- Torque all bolts in the correct sequence to 22 lb-ft (30 Nm).
- Torque all bolts in the correct sequence an additional 90 degrees.
- Torque all bolts in the correct sequence an additional 70 degrees.
- Verify all bolts are at their final torque spec.
Intake Manifold Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the intake manifold bolts on the 2.4L engine.
- Clean all threads of bolts and intake manifold.
- Install intake manifold and hand tighten all bolts.
- Torque all bolts to 18 lb-ft (25 Nm) in the correct sequence.
- Verify all bolts are at their final torque spec.
Exhaust Manifold Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the exhaust manifold bolts on the 2.4L engine.
- Clean all threads of bolts and exhaust manifold.
- Install exhaust manifold and hand tighten all bolts.
- Torque all bolts to 15 lb-ft (20 Nm) in the correct sequence.
- Verify all bolts are at their final torque spec.
Camshaft Bearing Cap Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the camshaft bearing cap bolts on the 2.4L engine.
- Clean all threads of bolts and bearing caps.
- Install bearing caps and hand tighten all bolts.
- Torque all bolts to 9 lb-ft (12 Nm) in the correct sequence.
- Verify all bolts are at their final torque spec.
Connecting Rod Cap Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the connecting rod cap bolts on the 2.4L engine.
- Clean all threads of bolts and connecting rod caps.
- Install connecting rod caps and hand tighten all bolts.
- Torque all bolts to 15 lb-ft (20 Nm).
- Torque all bolts an additional 75 degrees.
- Verify all bolts are at their final torque spec.
Crankshaft Pulley Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the crankshaft pulley bolt on the 2.4L engine.
- Clean all threads of bolts and crankshaft.
- Install crankshaft pulley and hand tighten bolt.
- Torque the bolt to 74 lb-ft (100 Nm).
- Torque the bolt an additional 120 degrees.
- Verify the bolt is at its final torque spec.
Timing Chain Tensioner Bolt Torque Procedure (2.4L)
This procedure outlines the steps to correctly torque the timing chain tensioner bolts on the 2.4L engine.
- Clean all threads of bolts and tensioner.
- Install tensioner and hand tighten all bolts.
- Torque all bolts to 89 lb-in (10 Nm).
- Verify all bolts are at their final torque spec.
Technical Service Bulletins
Engine Oil Consumption - 2.4L
2016-05-10This bulletin addresses reports of excessive oil consumption in 2.4L engines. Certain vehicles within the specified year range may exhibit increased oil usage due to piston ring issues.
Resolution: Inspect piston rings, consider replacement if deemed necessary. Ensure proper torque procedures are followed during reassembly.
Timing Chain Issues - 2.4L
2018-02-15This bulletin addresses reports of timing chain stretch or failure on certain 2.4L engines, which may cause drivability issues, noise, or engine damage. Early symptom detection is critical to prevent damage.
Resolution: Inspect timing chain tensioner, guide rails and chain for any signs of wear or stretch. Replace parts as needed. Ensure all related hardware is torqued to specification during reassembly.
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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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- If you're unsure about any procedure, consult a qualified professional mechanic.