Cadillac CTS 2003-2007 3.6L Engine Bolt Torque Specifications & Fastener Values
Cadillac CTS 2003-2007

Cadillac CTS 2003-2007 3.6L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for various bolts on the 3.6L engine in the 2003-2007 Cadillac CTS, including cylinder head, main bearing, connecting rod, and intake manifold bolts.

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 components related to the cylinder head, including head bolts and camshaft components.

1

Cylinder Head Bolts

M11 x 1.5
Important Notes
Torque to 18 ft-lbs (25 N·m), then tighten an additional 90 degrees. Use a proper torque sequence. Torque-to-yield bolts; must be replaced when removed.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Torque in sequence. Estimated value, verify with service manual.
3

Rocker Arm Shaft Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure rocker arms are correctly positioned prior to torquing. Formerly 89 in-lbs, value converted to ft-lbs.
4

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Ensure camshaft is locked in position prior to torquing.
5

Variable Valve Timing (VVT) Actuator Bolts/Solenoid Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, verify with service manual.

Engine Block

Specifications for components directly related to the engine block, including main bearings and oil pan.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Torque in sequence. Verify in service manual.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Use a new gasket. Formerly 97 in-lbs, value converted to ft-lbs
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer.
4

Oil Filter Housing Bolt

M27 x 2.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Hand-tight plus specific torque to ensure the correct seal.
5

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new gasket or sealant.
6

Water Pump Pulley Bolts

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

Connecting Rods

Specifications for connecting rod nuts.

1

Connecting Rod Nuts

M9 x 1.0
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Use new nuts. Verify in service manual.

Crankshaft

Specifications for components related to the crankshaft, including the flywheel and harmonic balancer.

1

Flywheel Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Use new bolts. Verify in service manual.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Use a new bolt. Verify in service manual.
3

Crank Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, verify with service manual. Formerly 89 in-lbs, value converted to ft-lbs.

Timing System

Specifications for components related to the timing system.

1

Timing Chain Tensioner Bolt

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

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, verify with service manual. Formerly 89 in-lbs, value converted to ft-lbs.

Intake System

Specifications for components related to the intake system.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Torque in a proper sequence. Verify in service manual.
2

Intake Manifold Plenum Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, verify with service manual. Formerly 89 in-lbs, value converted to ft-lbs.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs. Verify with service manual.
4

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
5

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs.
6

Fuel Injector Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs. This assumes the injectors are bolted, not just installed into the rail
7

Fuel Injector Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs.

Exhaust System

Specifications for components related to the exhaust system.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Torque in sequence. Verify in service manual
2

Exhaust Manifold/Headers to Cylinder Head Bolts

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

Cooling System

Specifications for components related to the cooling system.

1

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs. Use a new gasket or sealant.

Accessory Drive

Specifications for components related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
32 ft-lbs (43 N·m)
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)

Ignition System

Specifications for components related to the ignition system.

1

Spark Plugs

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Use a new spark plug with anti-seize compound on the threads.
2

Ignition Coil Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Formerly 89 in-lbs, value converted to ft-lbs. Verify with service manual.

Sensors

Specifications for engine sensors.

1

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value, verify with service manual.

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 specifications so important?

Using the correct torque specifications ensures proper clamping force between components. Insufficient torque can lead to leaks, loosening of bolts, and component failure. Overtightening can damage threads, strip bolts, or distort components. For example, over-torquing a cylinder head bolt can warp the head, leading to coolant leaks and engine damage.

Q2

Should I use new bolts when reassembling engine components?

It's generally recommended to use new bolts, especially for critical components like cylinder heads and connecting rods. Many bolts are torque-to-yield (TTY), meaning they stretch when torqued and should not be reused. Reusing TTY bolts can lead to inaccurate clamping force and premature failure. For example, re-using a torque-to-yield head bolt could result in a blown head gasket due to improper clamping.

Q3

What type of lubricant should I use on bolt threads?

Unless specified otherwise, use clean engine oil on bolt threads before tightening. Avoid using anti-seize compound on bolts unless it is specifically called for in the repair manual. Anti-seize can affect torque readings, leading to under- or over-tightening. For example, applying anti-seize on cylinder head bolts without accounting for it can lead to significantly less clamping force than required and potential engine damage.

Q4

What if I don't have a torque wrench?

A torque wrench is essential for accurately tightening bolts to their specifications. Relying on 'feel' is unreliable and can lead to component damage. Rent or borrow a torque wrench to ensure proper installation. For example, guessing the torque of intake manifold bolts could cause leaks leading to engine performance issues.

Q5

What is the tightening sequence and why does it matter?

The tightening sequence refers to the order in which you tighten bolts. Using the correct sequence prevents distortion of components and ensures even clamping force. For example, tightening cylinder head bolts in an improper sequence can warp the head and cause a failure, whereas, following the proper sequence will evenly distribute the load, resulting in a proper seal.

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 capable of measuring torque in both inch-pounds and foot-pounds, essential for applying precise torque to fasteners.

  • Wide torque range
  • Accurate readings
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A smaller calibrated torque wrench for fasteners requiring lower torque values. More suitable for smaller bolts.

  • Precise torque adjustment
  • Compact design
  • Easy to read scale
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, ranging in size to fit the various bolts and nuts on the 3.6L engine.

  • Variety of sizes
  • Durable construction
  • Easy to identify
Learn more

Extension Bars

Various length extension bars to reach bolts in tight or recessed areas.

  • Multiple length options
  • Durable construction
  • Secure connection
Learn more

Universal Joint

A universal joint or wobble socket to access fasteners at an angle.

  • Allows angled access
  • Durable construction
  • Multiple drive sizes
Learn more
Service Procedures

Intake Manifold Installation

Procedure for properly installing the intake manifold on the 3.6L engine, ensuring proper sealing and torque application.

  • Clean mating surfaces of the cylinder heads and intake manifold.
  • Position the new intake manifold gasket on the cylinder heads.
  • Carefully lower the intake manifold into position.
  • Install all intake manifold bolts by hand, then evenly torque them to 89 inch-pounds in a crisscross pattern.
  • Recheck all bolts to verify proper torque.
View full procedure

Cylinder Head Installation

Procedure for correctly installing cylinder heads on the 3.6L engine, focusing on proper bolt torque sequence and values.

  • Install new head gaskets onto the engine block.
  • Carefully place cylinder heads onto the block, aligning with the dowel pins.
  • Install cylinder head bolts hand-tight. Note that some bolts are longer than others.
  • Torque long head bolts to 22 ft-lbs and short head bolts to 18 ft-lbs in the proper sequence.
  • Tighten long head bolts an additional 80 degrees and short head bolts 60 degrees.
  • Verify all bolts are at final torque.
View full procedure

Valve Cover Installation

Procedure for properly installing valve covers, including proper gasket installation and torque application.

  • Clean mating surfaces of the cylinder heads and valve covers.
  • Position the new valve cover gasket on the cylinder head.
  • Carefully place valve covers into position.
  • Install valve cover bolts by hand, then evenly torque them to 89 inch-pounds.
  • Recheck all bolts to verify proper torque.
View full procedure

Camshaft Bearing Cap Installation

Procedure for properly installing the camshaft bearing caps, including proper orientation and torque application.

  • Ensure camshafts are correctly seated in the cylinder head.
  • Position the bearing caps in the correct locations.
  • Install the bearing cap bolts by hand, then evenly torque them to 89 inch-pounds.
  • Recheck all bolts to verify proper torque.
View full procedure
Technical Service Bulletins

Oil Leakage from Intake Manifold Area

2005-06-15

Reports of oil leaks originating from the intake manifold area on early model 3.6L engines may be caused by improper gasket sealing. Confirm all bolts are torqued to specification.

2003-2005

Resolution: Replace the intake manifold gasket and ensure all bolts are torqued to 89 inch-pounds in a crisscross pattern. Clean all mating surfaces prior to assembly.

Cylinder Head Bolt Retorque Procedure

2006-09-20

Some early production 3.6L engines have had issues with head bolt stretch. A retorque procedure is recommended on applicable engines.

2003-2006

Resolution: Loosen each head bolt 1/4 turn, one at a time, then retorque all long head bolts to 22 ft-lbs and short head bolts to 18 ft-lbs in the proper sequence. Then tighten long head bolts an additional 80 degrees and short head bolts 60 degrees. Verify all bolts are at final torque.

About the Author

Expert automotive knowledge and experience

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Cadillac Specs. All rights reserved.

Privacy Policy Terms of Service