Buick Enclave 2018-present 3.6L Engine Bolt Torque Specifications & Fastener Values
Buick Enclave 2018-present

Buick Enclave 2018-present 3.6L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for various bolts on the 3.6L V6 engine used in the 2018-Present Buick Enclave, including cylinder head, intake manifold, exhaust manifold, and more.

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

Components related to the cylinder head assembly, responsible for combustion and valve operation.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Cylinder head bolts are torque-to-yield. Use a new set of bolts every time. Follow a specific torque sequence and angle-tightening process. Refer to factory service manual for exact sequence.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten in sequence to evenly clamp the camshaft journals. Do not overtighten.
3

Valve Cover Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure valve cover is properly seated to prevent leaks.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure proper alignment of rocker arms during installation.
5

Ignition Coil Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper coil seating.

Engine Block

Components related to the engine block, including the rotating assembly and oil management.

1

Main Bearing Bolts

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Tighten in specified sequence to ensure proper crankshaft alignment. Check main bearing journal diameters for consistency.
2

Connecting Rod Nuts

M9 x 1.0
Important Notes
Connecting rod bolts/nuts are typically torque-to-yield. Use new bolts and follow specified sequence. Always verify connecting rod end play.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Use new oil pan gasket and evenly tighten to prevent leaks.
4

Timing Cover Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Use new timing cover gasket or sealant. Tighten evenly in a criss-cross pattern.
5

Oil Drain Plug

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new crush washer each time to prevent oil leaks. Do not overtighten.
6

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is properly seated. Do not overtighten.
7

Crankshaft Position Sensor Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper sensor seating against the engine block.

Intake Exhaust

Components related to air intake, fuel delivery, and exhaust systems.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Use new intake manifold gaskets, tighten in a criss-cross pattern to prevent leaks.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Use new exhaust manifold gaskets. Tighten evenly to prevent leaks.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure throttle body is properly aligned and seated to prevent vacuum leaks.
4

EGR Valve Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure EGR valve is properly seated with a new gasket. Prevents exhaust leaks.
5

Fuel Rail Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure fuel rail is properly seated. Prevents fuel leaks.
6

Fuel Injector Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure fuel injectors are properly seated.

Rotating Assembly

Components related to the crankshaft, camshafts, and timing system.

1

Flywheel Bolts

M10 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure flywheel or flexplate is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Ensure proper alignment of camshaft timing marks.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure crankshaft pulley is properly seated against crankshaft.
4

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Ensure proper alignment of timing marks before tightening.

Cooling System

Components related to engine cooling.

1

Water Pump Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new water pump gasket or sealant. Tighten evenly in a criss-cross pattern.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure pulley is properly seated on the pump.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new thermostat housing gasket or sealant. Tighten evenly to prevent leaks.

Electrical System

Components related to engine electrical operation.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure starter motor is properly aligned before tightening.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure alternator is properly aligned before tightening.
3

Camshaft Position Sensor Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper seating of the sensor to the engine.

Accessory Drive

Components related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure tensioner is aligned and seated correctly.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure idler pulley is properly seated.

Power Steering

Components related to the power steering system.

1

Power Steering Pump Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure power steering pump is correctly aligned before tightening.

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 specification ensures proper clamping force, preventing leaks, component failure, and damage to threads. Over-torquing can strip threads or damage components, while under-torquing can lead to loosening and leaks. For example, improperly torqued cylinder head bolts can lead to coolant leaks and engine damage, while under-torqued intake manifold bolts can cause vacuum leaks.

Q2

What tools do I need for torquing bolts to specification?

You will primarily need a calibrated torque wrench capable of measuring within the specified torque range for the fasteners. You may also need various sockets (both standard and metric) and extensions to access all bolts. For angle-torque specifications, an angle gauge or a torque wrench with an integrated angle meter is essential. An example of this is angle torquing the main bearing caps. Using a torque wrench is crucial for these types of procedures.

Q3

What does 'Nm' and 'lb-ft' mean?

'Nm' stands for Newton-meter, the metric unit of torque. 'lb-ft' stands for pound-foot, the imperial unit of torque. Both are units of rotational force and are used to measure bolt tightness. It's important to note what the spec calls for and use the correct unit when torquing fasteners. The 3.6L engine primarily uses both of these values.

Q4

What if I don't have a torque wrench?

While it might be tempting to 'guess' at the tightness, it's highly discouraged. It's strongly recommended to invest in a torque wrench for accurate and safe fastening. Incorrect torque can easily cause severe damage. Renting a torque wrench from an auto parts store can be a cost effective alternative.

Q5

Should I use new bolts when reassembling?

For certain critical components, such as cylinder head bolts and connecting rod bolts, it's highly recommended to use new bolts as they may have undergone stress and stretching during previous use. Reusing such bolts can compromise their strength and clamping ability. Other bolts, such as intake bolts, can usually be reused but should be visually inspected for damage.

Q6

What is the difference between standard torquing and angle torquing?

Standard torquing is measured in ft-lbs or Nm. Angle torquing is measured in degrees. When performing an angle torque specification you will have a certain initial ft-lb or Nm specification, followed by a degree torque specification which further tightens the bolt by measuring the degrees it is turned. An example of this would be the 3.6L cylinder head bolts.

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 1/2 inch drive torque wrench capable of measuring torque in ft-lbs and in-lbs or Nm, with sufficient range for listed torque specifications.

  • Accurate torque measurement
  • Durable construction
  • Click-style or digital readout
Learn more

Torque Wrench (3/8 inch Drive)

A 3/8 inch drive torque wrench for smaller fasteners, with sufficient range for listed torque specifications.

  • Accurate torque measurement
  • Durable construction
  • Click-style or digital readout
Learn more

Socket Set (Metric)

A comprehensive metric socket set to fit various bolt head sizes for the 3.6L engine, including standard and deep sockets.

  • Variety of sizes
  • Durable construction
  • 6-point and 12-point sockets
Learn more

Extension Bars (Various lengths)

Extension bars to reach fasteners in recessed or hard-to-access areas of the engine.

  • Durable steel construction
  • Various lengths for flexibility
  • Secure socket connection
Learn more

Universal Joint/Swivel Adapter

Allows sockets to be used at an angle for hard-to-reach bolts.

  • Durable construction
  • Wide range of motion
  • Secure socket connection
Learn more
Service Procedures

Intake Manifold Bolt Torque Procedure

Procedure for torquing the intake manifold bolts on the 3.6L V6 engine.

  • Locate all intake manifold bolts.
  • Snug all bolts in a crisscross pattern.
  • Torque bolts to 89 in-lbs (10 Nm) in the specified crisscross pattern.
  • Verify all bolts are torqued to specification.
View full procedure

Cylinder Head Bolt Torque Procedure

Procedure for torquing the cylinder head bolts on the 3.6L V6 engine.

  • Locate all cylinder head bolts.
  • Snug all bolts in the proper sequence.
  • Torque long bolts to 22 ft-lbs (30 Nm) and then rotate an additional 90 degrees in the specified sequence.
  • Torque short bolts to 22 ft-lbs (30 Nm) and then rotate an additional 55 degrees in the specified sequence.
  • Verify all bolts are torqued to specification
View full procedure

Valve Cover Bolt Torque Procedure

Procedure for torquing the valve cover bolts on the 3.6L V6 engine.

  • Locate all valve cover bolts.
  • Snug all bolts in a crisscross pattern.
  • Torque bolts to 89 in-lbs (10 Nm) in the specified crisscross pattern.
  • Verify all bolts are torqued to specification.
View full procedure

Connecting Rod Bolt Torque Procedure

Procedure for torquing the connecting rod bolts on the 3.6L V6 engine.

  • Locate all connecting rod bolts.
  • Snug all bolts in the proper sequence.
  • Torque bolts to 22 ft-lbs (30 Nm) and then rotate an additional 70 degrees in the specified sequence.
  • Verify all bolts are torqued to specification.
View full procedure

Exhaust Manifold Bolt Torque Procedure

Procedure for torquing the exhaust manifold bolts on the 3.6L V6 engine.

  • Locate all exhaust manifold bolts.
  • Snug all bolts in a crisscross pattern.
  • Torque bolts to 18 ft-lbs (25 Nm) in the specified crisscross pattern.
  • Verify all bolts are torqued to specification.
View full procedure
Technical Service Bulletins

Engine Oil Leak from Timing Cover Area

2020-07-15

Some 2018-2020 Buick Enclaves with the 3.6L engine may exhibit an oil leak from the timing cover area. This is often due to improper bolt torque or sealant failure.

2018-2020

Resolution: Inspect the timing cover for sealant failure. Replace the sealant and torque all bolts to specification (89 in-lbs / 10 Nm) in the proper sequence. Verify oil level after repair.

Cylinder Head Bolt Stretch Issue

2021-02-28

Some 2018-2021 models of the Enclave with the 3.6L engine may exhibit symptoms of cylinder head bolt stretch over time. This can lead to reduced clamping force and potential head gasket failure.

2018-2021

Resolution: Inspect head bolts during any repair involving the head. Replace any damaged or overstretched bolts, and ensure all bolts are torqued to the proper specification according to the steps detailed in the service procedure. Reusing torque-to-yield bolts may result in issues down the line.

Intake Manifold Gasket Leakage

2022-11-01

Some 2018-2022 Buick Enclave vehicles with the 3.6L engine may experience intake manifold gasket leaks. Ensure proper bolt torquing during manifold service to prevent recurrence.

2018-2022

Resolution: Replace the intake manifold gasket. Torque the intake manifold bolts to 89 in-lbs (10 Nm) using the specified crisscross pattern. Ensure surfaces are clean prior to reassembly.

About the Author

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Alan Montanye - Automotive Technical Specialist
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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
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