Buick Regal 2018-present 2.0L Engine Bolt Torque Specifications & Fastener Values
Buick Regal 2018-present

Buick Regal 2018-present 2.0L Engine Bolt Torque Specifications

Detailed torque specifications for various bolts on the 2.0L engine found in the 2018-Present Buick Regal. Includes cylinder head, main bearing cap, connecting rod, and other critical bolt torques.

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 and fasteners related to the cylinder head assembly, including securing the head to the block, bearing caps, and related components.

1

Cylinder Head Bolts (Long)

M11 x 1.5
Important Notes
Critical for sealing the cylinder head to the block. Torque-to-yield procedure. Use a spiral sequence, starting from the center outwards. Always replace these bolts.
2

Cylinder Head Bolts (Short)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the front cover of the cylinder head and smaller components. Estimated value.
3

Camshaft Bearing Cap Bolts

M6 x 1.0
Important Notes
Secures the camshaft bearing caps to the cylinder head. Proper sequence and torque are critical. Estimated value.

Engine Block

Specifications for main bearing cap and connecting rod cap bolts critical for the structural integrity of the engine block.

1

Main Bearing Cap Bolts

M12 x 1.75
Important Notes
Secures the crankshaft within the engine block. Torque-to-yield bolts. Always replace when removed. Estimated value.
2

Connecting Rod Cap Bolts

M9 x 1.25
Important Notes
Secures the connecting rod to the crankshaft. Torque-to-yield bolts, always replace when removed. Estimated value.

Intake Exhaust

Specifications for bolts and studs related to the intake and exhaust manifold systems.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the intake manifold to the cylinder head. Estimated value.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Attaches the exhaust manifold to the cylinder head. Estimated value.
3

Exhaust Manifold Studs (to Cylinder Head)

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Secures the exhaust manifold onto the cylinder head. These are pre-installed studs and don't need to be torqued on replacement, however, make sure they are torqued to spec during re-installation. Estimated value.
4

Exhaust Downpipe Bolts (Flange)

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Attaches the exhaust downpipe to the exhaust manifold. Estimated value.

Timing System

Specifications for bolts related to the camshaft, crankshaft, and timing chain components.

1

Camshaft Sprocket Bolt

M10 x 1.5
Important Notes
Secures the camshaft sprockets to the camshafts. Estimated value.
2

Crankshaft Pulley Bolt

M14 x 1.5
Important Notes
Attaches the crankshaft pulley to the crankshaft. Always replace this bolt when removed. Estimated value.
3

Timing Chain Tensioner Bolt

M6 x 1.0
Torque Value
5.8 ft-lbs (8 N·m)
Important Notes
Holds the timing chain tensioner in place. Estimated value.
4

Timing Chain Guide Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Bolts hold the timing chain guides in place. Estimated value.

Oil System

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

1

Oil Pan Bolts (Smaller)

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the oil pan to the engine block. Estimated value.
2

Oil Pan Bolts (Larger)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the oil pan to the engine block. Estimated value.
3

Oil Drain Plug

M14 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Seals the oil drain port. Estimated value.
4

Oil Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the oil pump to the engine block. Estimated value.
5

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Attaches the oil filter housing to the engine. Estimated value.

Cooling System

Specifications for bolts related to the water pump and thermostat housing.

1

Water Pump Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the water pump to the engine. Estimated value.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the thermostat housing to the engine. Estimated value.

Miscellaneous

Specifications for bolts securing components such as the starter motor, alternator, and engine mounts.

1

Starter Motor Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the starter motor to the engine. Estimated value.
2

Alternator Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the alternator to the engine. Estimated value.
3

Engine Mount Bolts

M12 x 1.75
Important Notes
Secure the engine to the chassis through motor mounts. Torque-to-yield. Always replace these bolts. Estimated value.

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 are torque specifications important for the 2.0L engine?

Torque specifications are crucial because they ensure proper clamping force on bolted connections within the 2.0L engine. Too little torque can lead to leaks, vibrations, and component failure. Too much torque can strip threads, warp components, or break bolts. Following the correct torque ensures the components function as designed and maintains the engine's structural integrity. For example, improper torque on cylinder head bolts can cause head gasket leaks and catastrophic engine damage.

Q2

What happens if I over-torque a bolt on the 2.0L engine?

Over-torquing bolts can lead to several issues including bolt stretching or breakage, damage to the threads in the engine block or component, and component deformation. For example, over-tightening the intake manifold bolts can crush the gasket, leading to vacuum leaks and poor engine performance. Always use a calibrated torque wrench and the specified torque value.

Q3

Can I reuse torque-to-yield (TTY) bolts on the 2.0L engine?

No, torque-to-yield (TTY) bolts, often used in critical applications like cylinder head bolts on the 2.0L engine, should NEVER be reused. TTY bolts are designed to stretch and deform when torqued. Reusing them can lead to improper clamping, component failure, and severe engine damage. Always replace TTY bolts with new ones when disassembling and reassembling components.

Q4

Should I lubricate bolts before torquing them on the 2.0L engine?

The need for lubrication depends on the bolt's specification and the service manual instructions. Some bolts require lubrication, usually with engine oil, to achieve proper torque. Others, often bolts with special coatings, should be torqued dry. Always consult the service manual for your specific 2.0L engine. For instance, rod bolts typically require lubrication but intake manifold bolts often do not.

Q5

How often should I check torque specs on the 2.0L engine?

Typically, torque specs don't need regular checking unless a component has been recently disassembled and reassembled. However, after specific services like head gasket replacement, it's recommended to perform a 're-torque' on specific bolts according to the service manual. This allows for the settling of gaskets. It is good practice to check the torque of any recently serviced or replaced component after the first few heat cycles of the engine.

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 to accurately apply specified torque values. 1/2-inch drive is recommended for most engine bolts.

  • Wide torque range (e.g., 20-250 ft-lbs)
  • Click-type or digital readout
  • Accurate calibration
Learn more

Torque Wrench (3/8-inch Drive)

A smaller torque wrench for lower torque bolts and fasteners. 3/8-inch drive is common for intake and accessory bolts.

  • Lower torque range (e.g., 5-80 ft-lbs)
  • Click-type or digital readout
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt and nut sizes used on the 2.0L engine.

  • Variety of socket sizes (8mm to 24mm+)
  • 6-point sockets preferred for better grip
  • Both standard and deep sockets
Learn more

Extension Bars (Various Lengths)

Extension bars of various lengths to reach recessed or difficult-to-access bolts.

  • 1/2-inch and 3/8-inch drive sizes
  • Various lengths (e.g., 3 inch, 6 inch, 10 inch)
  • Durable construction
Learn more

Universal Joint

A universal joint adapter to allow access to bolts at angles.

  • 1/2-inch and 3/8-inch drive sizes
  • Durable construction
  • Smooth operation
Learn more

Torque Angle Meter

Used to measure angle when torque angle tightening is required.

  • Digital or analog measurement
  • Clear display
  • Precise angle measurement
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Procedure for tightening cylinder head bolts on the 2.0L engine. Critical for proper sealing.

  • Apply new cylinder head bolts.
  • Tighten all bolts in sequence to 22 lb-ft (30 Nm).
  • Tighten all bolts in sequence to 90 degrees.
  • Tighten all bolts in sequence to an additional 70 degrees.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Procedure for tightening main bearing cap bolts on the 2.0L engine. Essential for crankshaft support.

  • Apply new main bearing cap bolts.
  • Tighten all bolts in sequence to 26 lb-ft (35 Nm).
  • Tighten all bolts in sequence to an additional 50 degrees.
  • Tighten the outer bolts on each bearing cap in sequence to 15 degrees.
View full procedure

Connecting Rod Bolt Torque Procedure

Procedure for tightening connecting rod bolts on the 2.0L engine. Crucial for piston rod connection.

  • Apply new connecting rod bolts.
  • Tighten all bolts in sequence to 15 lb-ft (20 Nm).
  • Tighten all bolts in sequence to an additional 60 degrees.
View full procedure

Intake Manifold Bolt Torque Procedure

Procedure for tightening the intake manifold bolts on the 2.0L engine.

  • Install intake manifold and bolts.
  • Tighten bolts to 18 lb-ft (25 Nm)
View full procedure

Exhaust Manifold Bolt Torque Procedure

Procedure for tightening the exhaust manifold bolts on the 2.0L engine.

  • Install exhaust manifold and bolts.
  • Tighten bolts to 18 lb-ft (25 Nm).
View full procedure
Technical Service Bulletins

Engine Knocking Noise Diagnosis and Repair

2020-06-15

Bulletin addressing potential engine knocking issues related to improper torque of engine fasteners. Recommended torque check before further diagnostics.

2018-2020 Buick Regal with 2.0L engine

Resolution: Inspect and correct torque values on relevant engine bolts, focusing on cylinder head, main bearing, and connecting rod fasteners. Use recommended tools and follow proper procedures.

Oil Leak Diagnosis from Valve Cover

2021-03-10

Bulletin addressing potential oil leaks from the valve cover which may be a result of improper torque.

2018-2021 Buick Regal with 2.0L engine

Resolution: Inspect and correct the valve cover bolt torque to 8 lb-ft (11 Nm). Replace the gasket if necessary.

Updated Torque Specifications for Cylinder Head Bolts

2022-01-20

Revised cylinder head bolt torque specifications to improve sealing and longevity. Update all service manuals with these new specifications

2018-2022 Buick Regal with 2.0L engine

Resolution: Use the updated torque specification: 22 lb-ft (30 Nm) + 90 Degrees + 70 Degrees. Ensure bolts are replaced when removed.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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