Buick LaCrosse 2010-2016 2.4L Engine Bolt Torque Specifications & Fastener Values
Buick LaCrosse 2010-2016

Buick LaCrosse 2010-2016 2.4L Engine Bolt Torque Specifications

Comprehensive guide to the bolt torque specifications for the 2.4L engine found in the 2010-2016 Buick LaCrosse. Includes torque values for cylinder head bolts, main bearing caps, connecting rod bolts, and other critical engine fasteners.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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 bolts related to the cylinder head assembly, including securing the head to the block and associated components.

1

Cylinder Head Bolts

M11 x 1.5
Important Notes
Torque in sequence per manufacturer's specification. Final torque is achieved by two additional 90 degree angle turns after the initial torque.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value, check factory service data. Torque in sequence per manufacturer's specifications.
3

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Torque in sequence, start with the center bolts and work outwards.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque evenly to prevent leaks. Value converted from inch-lbs.
5

Rocker Arms/Shafts Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs
6

Ignition Coil Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs
7

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure spark plugs are properly seated before torquing.

Engine Block

Torque specifications for components attached to the engine block, including rotating assembly and oil system parts.

1

Main Bearing Bolts

M10 x 1.5
Important Notes
Torque in sequence per manufacturer's specification. Final torque achieved by an additional 60 degree angle turn.
2

Connecting Rod Nuts

M9 x 1.25
Important Notes
Torque in sequence per manufacturer's specification. Final torque achieved by an additional 70 degree angle turn.
3

Flywheel Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Torque in a star pattern to ensure even pressure.
4

Oil Pan Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque in a cross pattern. Value converted from inch-lbs.
5

Timing Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs. Torque in a cross pattern.
6

Knock Sensor Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
7

Oil Drain Plug

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer each time the plug is removed.
8

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)

Intake System

Torque specifications for the components of the intake system, including the manifold and throttle body.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Torque in sequence to prevent leaks. Value converted from inch-lbs.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs
3

Fuel Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs
4

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs

Timing System

Torque specifications for bolts related to the timing system components, such as tensioners and sprockets.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
2

Camshaft Sprocket Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)

Cooling System

Torque specifications for the components of the cooling system, including water pump pulley and thermostat housing.

1

Water Pump Pulley Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
2

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Value converted from inch-lbs

Accessory Drive

Torque specifications for components related to the accessory drive system, including the crankshaft pulley and belt tensioner.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Important Notes
Final torque is achieved by an additional 60 degree angle turn.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
3

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)

Exhaust System

Torque specifications for bolts related to the exhaust system, including the EGR valve.

1

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)

Oil System

Torque specs for components related to the oil system, including the oil filter housing.

1

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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 specification important?

Using the correct torque is critical to ensure a proper and secure connection. Under-torquing can lead to parts loosening and leaks, while over-torquing can damage threads, bolts, and components like cylinder heads or the engine block. It also ensures the proper clamping force is achieved for sealing and component operation.

Q2

What type of torque wrench should I use?

A calibrated torque wrench, either beam or clicker-type, is recommended. Digital torque wrenches are also suitable but should be properly calibrated. Avoid using impact wrenches for final torque as they are difficult to control and often lead to over-torquing. For example, using an impact gun on the oil pan bolts will likely cause damage.

Q3

Do I need to use new bolts when working on the 2.4L engine?

While not always necessary, it is often recommended to use new bolts, especially for critical components like cylinder head bolts, connecting rod bolts, and main bearing cap bolts. These bolts can stretch after being torqued to specification, and reusing them could lead to improper clamping and potential failure. Consider using new cylinder head bolts if the heads have been removed for any repairs.

Q4

What is the difference between dry and lubricated torque specifications?

Torque specifications can differ based on whether the threads are dry or lubricated. Lubrication reduces friction between the threads and the bolt/nut interface. Using the 'dry' torque spec on lubricated threads will lead to over-torquing, while using the 'lubricated' spec on dry threads will lead to under-torquing. Always refer to the correct specification for your application. For example, many head bolts require lubrication on the threads and under the bolt head to achieve proper torque.

Q5

What if I don't have access to the exact torque specs?

While generally not recommended, using generic torque specifications as a last resort may be considered, but only after researching and using resources that provide torque values based on bolt size and grade. If it is critical, like cylinder head bolts, it is best to obtain the exact manufacturer specifications. For general components like intake manifold bolts, the risks are not as significant but using generic values is done at one's own risk. For example, a specific bolt size with a grade 8 mark may have generalized torque values available but they are not as reliable as the manufacturer.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 manufacturer's specifications.

  • Wide torque range (typically 20-150 ft-lbs)
  • Audible click or digital display to indicate torque value
  • 1/2-inch drive for standard socket sizes
Learn more

Torque Wrench (3/8-inch drive)

A smaller torque wrench is needed for lower torque fasteners.

  • Lower torque range (typically 5-80 ft-lbs)
  • Audible click or digital display to indicate torque value
  • 3/8-inch drive for smaller socket sizes
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, both standard and deep, is necessary for accessing bolts in various locations.

  • Wide range of sizes (8mm - 24mm)
  • 6-point sockets for secure grip
  • Includes both standard and deep sockets
Learn more

Extension Bars

Extension bars help reach recessed or difficult to access fasteners.

  • Various lengths for different applications
  • 3/8-inch and 1/2-inch drive sizes to match torque wrenches
Learn more

Universal Joint (Swivel)

A universal joint allows the socket to rotate at an angle, which is necessary for certain bolt locations.

  • Allows angled access to fasteners
  • Multiple drive sizes
Learn more

Thread Locker (Medium Strength)

A thread locker is used to secure bolts that may vibrate loose.

  • Prevents loosening of bolts due to vibration
  • Medium strength allows disassembly with hand tools
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the cylinder head bolts to the specified torque and sequence.

  • Clean the threads on the cylinder head bolts and in the engine block.
  • Install the cylinder head and bolts by hand, in the correct orientation.
  • Torque all bolts to 22 ft-lbs in the correct sequence (Consult service manual for sequence).
  • Torque all bolts to 90 degrees in the correct sequence.
  • Torque all bolts to 70 degrees in the correct sequence.
View full procedure

Camshaft Bearing Cap Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the camshaft bearing cap bolts to the specified torque and sequence.

  • Clean the threads on the camshaft bearing cap bolts and in the cylinder head.
  • Install the camshaft bearing caps and bolts by hand, in the correct orientation.
  • Torque all bolts to 89 inch-lbs in the correct sequence (Consult service manual for sequence).
  • Torque all bolts to 50 degrees in the correct sequence.
View full procedure

Intake Manifold Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the intake manifold bolts to the specified torque and sequence.

  • Clean the threads on the intake manifold bolts and in the cylinder head.
  • Install the intake manifold and bolts by hand, in the correct orientation.
  • Torque all bolts to 18 ft-lbs in the correct sequence (Consult service manual for sequence).
View full procedure

Exhaust Manifold Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the exhaust manifold bolts to the specified torque and sequence.

  • Clean the threads on the exhaust manifold bolts and in the cylinder head.
  • Install the exhaust manifold and bolts by hand, in the correct orientation.
  • Torque all bolts to 18 ft-lbs in the correct sequence (Consult service manual for sequence).
View full procedure

Connecting Rod Cap Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the connecting rod cap bolts to the specified torque and sequence.

  • Clean the threads on the connecting rod cap bolts and in the connecting rod.
  • Install the connecting rod caps and bolts by hand, in the correct orientation.
  • Torque all bolts to 15 ft-lbs.
  • Torque all bolts an additional 70 degrees using an angle gauge
View full procedure

Oil Pan Bolt Tightening Procedure

This procedure outlines the correct steps for tightening the oil pan bolts to the specified torque.

  • Clean the threads on the oil pan bolts and in the engine block.
  • Install the oil pan and bolts by hand, in the correct orientation.
  • Torque all bolts to 106 inch-lbs in a crisscross pattern.
View full procedure
Technical Service Bulletins

Excessive Oil Consumption 2.4L Engine

2015-03-15

Some 2.4L engines may exhibit excessive oil consumption due to piston ring issues. Check for diagnostic codes and perform a compression test to evaluate engine condition.

2010-2016

Resolution: Replacement of piston rings, and associated components may be required. Consult the full bulletin for diagnosis and specific repair instructions.

Variable Valve Timing Actuator Failure

2014-08-22

Certain 2.4L engines may experience issues with the Variable Valve Timing (VVT) actuators. These failures can cause rough idling and reduced engine performance. Check for DTCs related to VVT systems.

2010-2015

Resolution: Inspect VVT actuator, related sensors and wiring harnesses. Replace actuator and associated components as needed. Consult the full bulletin for diagnosis and specific repair instructions.

Camshaft Position Actuator Oil Leakage

2012-11-01

Reports of oil leakage around camshaft position actuator and valve cover area have been reported. Insure all seals and gaskets are not damaged before replacement.

2010-2013

Resolution: Inspect area for oil leakage and ensure all bolt torques meet manufacture specifications. Replace valve cover, camshaft position actuator and gaskets if damage is found.

About the Author

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Alan Montanye

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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.
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