Buick Enclave 2008-2017 3.6L Engine Bolt Torque Specifications & Fastener Values
Buick Enclave 2008-2017

Buick Enclave 2008-2017 3.6L Engine Bolt Torque Specifications

Comprehensive torque specifications for various bolts on the 3.6L engine of the 2008-2017 Buick Enclave, ensuring proper installation and engine performance.

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

Specifications for bolts securing the cylinder head to the engine block. Proper torque is critical for sealing and compression.

1

Cylinder Head Bolts

M10 x 1.5
Important Notes
Apply torque in a specified sequence. Always consult the service manual for the correct sequence diagram.

Engine Block

Specifications for fasteners attaching components to the engine block.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque in the proper sequence, refer to the specific service manual for the correct sequence diagram.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Torque all connecting rod nuts evenly, use new nuts if necessary.
3

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
4

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor mounting surface is clean and free from debris.

Rotating Assembly

Specifications for fasteners related to the crankshaft, flywheel, and other rotating components.

1

Flywheel Bolts

M10 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Use new bolts if recommended by manufacturer.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use a crankshaft holding tool to prevent crankshaft rotation during tightening. Check for any damage on the pulley before installing.

Oil System

Specifications for bolts related to the oil pan, oil filter housing, and drain plug.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Torque in a criss-cross pattern for even gasket compression. Use a new gasket if required.
2

Oil Filter Housing Cap

N/A - Threaded Cap
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten by hand until snug, then use a wrench to finish. Do not overtighten.
3

Oil Drain Plug

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer or sealing ring for proper sealing.

Valve Train

Specifications for bolts securing components of the valve train system, such as valve covers, camshaft sprockets, and rocker arms.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Torque in a criss-cross pattern to ensure even gasket pressure. Do not overtighten.
2

Camshaft Sprocket Bolts

M8 x 1.25
Torque Value
75 ft-lbs (101 N·m)
Important Notes
Use a camshaft holding tool to prevent camshaft rotation during tightening. Ensure the sprockets are correctly aligned.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Torque bolts evenly.
4

Variable Valve Timing (VVT) Solenoid Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)

Timing System

Specifications for bolts securing components of the timing system, including tensioners.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Ensure tensioner is properly engaged before tightening.

Intake System

Specifications for bolts attaching components of the intake system, including the intake manifold and throttle body.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque in the correct sequence, typically from the center outwards. Use a new gasket if necessary.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the throttle body gasket is properly aligned.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a new gasket if required. Ensure proper alignment before tightening.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure fuel injectors are properly installed before securing the fuel rail. Check for leaks after installation.
5

Fuel Injector Bolts

M6 x 1.0 or Retaining Clips
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
For bolted injectors, torque to spec. For clips, ensure they are fully seated. Inspect for proper alignment and sealing.

Exhaust System

Specifications for bolts attaching exhaust manifolds/headers to cylinder heads.

1

Exhaust Manifold/Header Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Torque in a sequence moving from the center outwards to ensure an even seal.
2

Exhaust Manifold to Exhaust Pipe Stud

M8
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use new hardware and tighten evenly.

Cooling System

Specifications for bolts securing components of the cooling system such as the water pump and thermostat housing.

1

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new gasket or sealant. Tighten evenly.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the pulley is correctly seated against the water pump flange.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Use a new gasket or o-ring. Ensure the thermostat is correctly seated.
4

Coolant Temperature Sensor Bolt/Fitting

M12 x 1.5 or Threaded Fitting
Torque Value
15 ft-lbs (20 N·m)
Important Notes
If a threaded fitting, do not over tighten. Use thread sealant if necessary.

Ignition System

Specifications for bolts securing components of the ignition system.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the coil is correctly seated on the spark plug.
2

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Do not overtighten, as this can damage the cylinder head or spark plug.

Accessory Drive

Specifications for bolts that secure components like the belt tensioner and idler pulley

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the tensioner.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the pulley.

Engine Mounts

Specifications for bolts securing the engine mounts to the engine block.

1

Engine Mount Bolts (to Engine)

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure all mounts are properly aligned before fully tightening.

Sensors

Specifications for sensor mounting bolts.

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)

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 it crucial to use the correct torque specifications?

Using the correct torque specifications for bolts is essential to ensure proper component clamping force. Insufficient torque can lead to loosening, leaks, and component failure, while excessive torque can stretch or break bolts, damage threads, and distort parts. For example, overtightening a cylinder head bolt can crush the head gasket, causing compression leaks and engine damage, while undertightening it can lead to the same leaks. Proper torque ensures a secure and lasting repair.

Q2

What happens if I don't have a torque wrench?

While it's strongly recommended to use a torque wrench for accurate results, if you do not have one, use extreme caution. Trying to estimate torque is very risky and can result in both undertightening and overtightening. A small error in torque, especially on critical engine components, can have significant consequences such as leaks, broken bolts, and even engine failure. If you must complete the repair and cannot obtain a torque wrench, carefully tighten the bolt until it feels snug, being careful not to apply too much force; however, this is not an ideal solution and should only be considered a temporary fix.

Q3

Should I use new bolts when reassembling engine components?

It is often recommended, especially with critical components like cylinder heads, to use new bolts. Many bolts are designed to stretch slightly when torqued to their specification, and they cannot be used a second time as they can lose their tensile strength. Reusing torque-to-yield bolts could lead to improper clamping and subsequent engine damage or failure, particularly in the 3.6L engine, which has specific torque requirements. Consult your vehicle's repair manual for specific recommendations.

Q4

Do torque specifications vary depending on whether the bolts are oiled or dry?

Yes, torque specifications can change depending on whether the bolt threads and mating surfaces are lubricated or dry. Oiled threads reduce friction, resulting in more clamping force at the same torque value. If a bolt calls for a dry torque specification, but the threads are inadvertently oiled, the component will be overtightened, risking damage. Always follow the specified torque with the conditions given in the workshop manual. The 3.6L engine often uses specific torque specifications with bolts lightly lubricated, therefore verifying in the service manual is important.

Q5

How do I deal with damaged threads during reassembly?

Damaged threads can severely impact your ability to properly torque a bolt. If threads are damaged in a bolt hole, it should be repaired before attempting reassembly. A common method of repair is using a thread repair kit or tap to restore the threads. For damaged bolt threads, the bolt should be replaced. Forcing a bolt into damaged threads may cause it to bind and give a false torque reading, leading to an improper clamping and potentially damaging or ruining the component. Trying to force a bolt in will also cause an inaccurate torque reading. This may result in leaks or component failures. If you are uncomfortable repairing damaged threads, it is best to seek professional help.

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" Drive)

A calibrated torque wrench for accurate tightening of fasteners.

  • Click-type mechanism
  • Wide torque range (e.g., 10-150 ft-lbs)
  • Accurate to +/- 3%
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for fasteners requiring lower torque values.

  • Click-type mechanism
  • Torque range appropriate for smaller fasteners (e.g., 5-80 ft-lbs)
  • Accurate to +/- 3%
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt heads.

  • Various sizes (e.g., 8mm - 24mm)
  • 6-point design for better grip
  • Deep and shallow sockets
Learn more

Extension Bars

Various length extension bars to reach fasteners in confined spaces.

  • Various lengths
  • Durable construction
  • Secure connection to sockets
Learn more

Universal Joint

A universal joint to angle sockets for difficult to reach bolts.

  • Allows for angled access
  • Durable construction
  • Secure connection to sockets
Learn more
Service Procedures

Intake Manifold Installation (3.6L)

Procedure for installing the intake manifold on the 3.6L engine, including torque specifications.

  • Clean the mating surfaces of the cylinder heads and intake manifold.
  • Position the intake manifold gasket and install the manifold.
  • Hand-tighten all intake manifold bolts.
  • Torque intake manifold bolts to 89 lb-in (10 Nm) in a criss-cross pattern.
  • Torque intake manifold bolts to final torque of 106 lb-in (12 Nm) in a criss-cross pattern.
  • Verify proper installation and connections.
View full procedure

Cylinder Head Installation (3.6L)

Procedure for installing cylinder heads on the 3.6L engine, including torque specifications and sequencing.

  • Clean the cylinder block and cylinder head mating surfaces.
  • Position the cylinder head gasket and carefully install the cylinder head.
  • Install all cylinder head bolts and hand-tighten them.
  • Torque all bolts to 22 lb-ft (30 Nm).
  • Torque all bolts to final torque of 52 lb-ft (70 Nm).
  • Using a torque angle meter, tighten bolts (1-10) another 90 degrees.
  • Using a torque angle meter, tighten bolts (1-10) an additional 70 degrees.
  • Install remaining components and verify proper operation.
View full procedure

Camshaft Bearing Cap Installation (3.6L)

Procedure for installing the camshaft bearing caps, including torque specifications.

  • Position camshaft in the cylinder head.
  • Install camshaft bearing caps and hand-tighten bolts.
  • Torque bolts to 89 lb-in (10 Nm).
  • Install remaining engine components.
  • Verify proper operation.
View full procedure

Connecting Rod Cap Installation (3.6L)

Procedure for installing connecting rod caps, including torque specifications.

  • Position connecting rod and cap on the crankshaft journal.
  • Install cap bolts and hand tighten.
  • Torque bolts to 18 lb-ft (25 Nm).
  • Torque bolts an additional 50 degrees.
  • Install remaining engine components and verify proper operation.
View full procedure

Main Bearing Cap Installation (3.6L)

Procedure for installing the main bearing caps, including torque specifications.

  • Position the main bearing cap on the crankshaft journal.
  • Install the main bearing cap bolts and hand-tighten.
  • Torque all bolts to 15 lb-ft (20 Nm).
  • Torque bolts an additional 45 degrees.
  • Install remaining engine components and verify proper operation.
View full procedure
Technical Service Bulletins

Engine Knock/Ticking Noise

2012-05-15

Some 2008-2012 Enclaves may experience engine knock or ticking noises due to carbon buildup or valve issues. Proper torque of related components is critical after repair.

2008-2012

Resolution: Clean carbon deposits, inspect valves and reassemble using specified torque values for fasteners.

Oil Leak Diagnosis

2015-08-20

Some oil leaks have been reported at various locations on 3.6l engines. This bulletin details common leaks and relevant torque specs for repair.

2013-2017

Resolution: Inspect valve cover, oil pan, and oil cooler lines for leaks, replacing gaskets as needed and torquing fasteners to specification.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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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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