Cadillac STS 2005-2011 3.6L Engine Bolt Torque Specifications & Fastener Values
Cadillac STS 2005-2011

Cadillac STS 2005-2011 3.6L Engine Bolt Torque Specifications

Detailed torque specifications for the 3.6L engine bolts in the 2005-2011 Cadillac STS, including cylinder head, main bearing, and connecting rod 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

Fasteners related to securing the cylinder heads to the engine block.

1

Cylinder Head Bolts

M11 x 1.5
Important Notes
These bolts are likely Torque-to-Yield (TTY) and should be replaced when removed. Use a proper torque sequence from the service manual. Torque steps may be split into two 90 degree turns.

Engine Block

Fasteners related to components mounted directly to the engine block.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Main bearing bolts should be torqued in sequence. Consult the service manual.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten in a criss-cross pattern to evenly distribute pressure. Do not overtighten.
3

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Hand tighten only then 10 N·m to seal the O-ring correctly. Use a new o-ring.
4

Oil Drain Plug

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new sealing washer with the drain plug.
5

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten the water pump bolts evenly, in a criss-cross pattern to ensure even pressure on the seal.
6

Engine Coolant Temperature Sensor

M12 x 1.5
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Use a new sealing washer. Do not over tighten.
7

Knock Sensor

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the sensor is properly seated against the block before tightening.
8

Valve Lifter Guide Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the valve lifter guides are properly aligned.

Rotating Assembly

Fasteners related to the engine's rotating components.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a proper sequence for tightening connecting rod nuts. These may be torque-to-yield (TTY). Check the manual.
2

Flywheel Bolts

M12 x 1.25
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Apply threadlocker to the flywheel bolts. Tighten evenly in a star pattern.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Apply a small amount of oil to the bolt threads. Use a tool to hold the crankshaft in place when torquing this bolt. Additional angle might be needed, check service manual.

Valvetrain

Fasteners related to the engine's valvetrain components.

1

Camshaft Sprocket Bolt

M10 x 1.25
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Use a tool to hold the camshaft in place when torquing these bolts. Follow the service manual for specific procedures.
2

Camshaft Bearing Cap Bolts/Nuts

M6 x 1.0
Important Notes
Camshaft bearing cap bolts usually require an angle torque specification. Always use a service manual when working with camshaft components.
3

Rocker Arm Shaft Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Make sure the rocker arms are properly seated before tightening.
4

Variable Valve Timing Actuator Solenoid

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Use new seals and do not over tighten.

Timing System

Fasteners related to the engine's timing system.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure the tensioner is properly aligned. Consult the service manual for specific procedures.

Intake And Exhaust

Fasteners related to the intake and exhaust systems.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten the bolts evenly in a criss-cross pattern to ensure a proper seal.
2

Exhaust Manifold/Header Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Tighten the bolts evenly in a star pattern.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new gasket.
4

Throttle Body Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten in a criss-cross pattern. Do not over tighten.

Fuel System

Fasteners related to the fuel delivery system.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent leaks.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure fuel injectors are properly seated with new o-rings. Do not overtighten.

Ignition System

Fasteners related to the ignition system.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Make sure the ignition coils are correctly positioned. Do not over tighten.
2

Spark Plugs

M14 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Use anti-seize compound sparingly on the threads. Do not over tighten.

Cooling System

Fasteners related to the engine's cooling system.

1

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern.
2

Thermostat Housing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new gasket, tighten evenly.

Sensors

Fasteners for various sensors around the engine.

1

Crankshaft Position Sensor

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Make sure the sensor is seated correctly.
2

Camshaft Position Sensor

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Make sure the sensor is seated correctly.

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 is crucial to ensure proper clamping force between components, preventing leaks, and avoiding damage to threads or parts. Overtightening can strip threads or deform components, while undertightening can lead to leaks and loosening over time. For example, overtightening a valve cover bolt can crush the gasket, leading to oil leaks; undertightening can cause oil to seep out.

Q2

What type of torque wrench should I use for these torque specs?

For most engine components on the 3.6L Cadillac STS, a click-type torque wrench is recommended. This type allows you to preset the desired torque and it clicks when reached. Ensure it is within its calibrated range for accurate readings. A digital torque wrench can also be used and may be more precise, but is not always necessary.

Q3

Do I need to replace bolts after removing them?

Generally, many bolts can be reused, but torque-to-yield (TTY) bolts should ALWAYS be replaced. TTY bolts stretch upon tightening and are designed for single use. Examples within the 3.6L engine include cylinder head bolts (often TTY). Always consult your service manual to determine which bolts need replacement.

Q4

What is the difference between 'lb-ft' and 'lb-in' when referring to torque?

'lb-ft' refers to pound-feet, while 'lb-in' refers to pound-inches. One pound-foot is equal to 12 pound-inches. 'lb-ft' is typically used for higher torque applications, like main caps or cylinder heads, while 'lb-in' is used for lower torque applications such as valve covers or intake manifold bolts. Always ensure your torque wrench is set to the correct units.

Q5

What should I do if I accidentally overtighten a bolt?

If you overtighten a bolt, it's critical to inspect it and the surrounding components for damage. Remove the bolt and check for thread damage. If threads are damaged on the bolt or engine block, they will need to be repaired. Replacing the bolt may be necessary and repair of the threads of the receiving component if damaged may be required. It is always best to err on the side of caution.

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 is essential for accurately tightening bolts to specified torque values.

  • Click-type mechanism for accurate torque application
  • 1/2 inch drive for common socket sizes
  • Wide torque range covering engine specifications
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for bolts requiring lower torque values.

  • Click-type mechanism
  • 3/8 inch drive
  • Lower torque range than 1/2 inch wrench
Learn more

Socket Set (Standard & Metric)

A comprehensive socket set including both standard and metric sizes needed for various engine bolts.

  • Variety of sizes to fit all engine bolts
  • Durable construction for repeated use
  • Deep and shallow sockets
Learn more

Extension Bars

Extension bars of varying lengths to reach recessed bolts.

  • Different lengths
  • Secure attachment
Learn more

Universal Joint

A universal joint allows for torque application at an angle

  • Allows torque application at an angle
  • Durable construction
Learn more
Service Procedures

Cylinder Head Bolt Tightening Sequence

Procedure for tightening cylinder head bolts to specification. This is a multi-step sequence to ensure uniform pressure and prevent leaks.

  • Apply new cylinder head bolts and lightly thread into place.
  • Tighten all bolts, in the sequence provided, to 22 ft-lb.
  • Tighten all bolts, in the sequence provided, an additional 90 degrees.
  • Tighten all bolts, in the sequence provided, an additional 70 degrees.
View full procedure

Intake Manifold Bolt Tightening

Procedure to properly tighten intake manifold bolts to specification using the correct sequence.

  • Locate the correct tightening sequence for the intake manifold.
  • Start with the center bolts and work outwards in a spiral.
  • Tighten to 89 lb-in (10 Nm) in the specified sequence.
  • Recheck the torque of all bolts in the sequence.
View full procedure

Timing Cover Bolt Tightening

Procedure for tightening the timing cover bolts using a specific sequence.

  • Locate the bolt pattern for the timing cover.
  • Tighten the bolts, following sequence, to 89 lb-in (10 Nm).
  • Recheck torque on all bolts in the sequence
View full procedure

Camshaft Bearing Cap Bolt Tightening

Procedure for tightening the camshaft bearing cap bolts to the specified torque. This process is critical to proper camshaft operation.

  • Lightly seat all camshaft bearing cap bolts.
  • Tighten the bolts to 89 lb-in (10 Nm), following the correct sequence.
  • Recheck torque on all bolts.
View full procedure
Technical Service Bulletins

Engine Ticking Noise After Repair

2007-05-15

Some 2005-2007 STS models have reported a ticking noise post engine repair due to an improperly torqued valve cover.

2005-2007

Resolution: Remove and reinstall the valve cover using the correct tightening sequence and 89 lb-in torque. Ensure a new gasket is installed.

Oil Leak from Front Cover

2009-01-22

Reports of oil leaks from the front timing cover on certain 2008-2009 3.6L equipped vehicles are linked to inadequate torque on the front cover bolts during factory assembly or previous repairs.

2008-2009

Resolution: Remove the front timing cover, replace the gasket with a new one, and retighten bolts to 89 lb-in (10 Nm) using the specified sequence.

Cylinder Head Bolt Re-Torque Procedure

2010-10-01

In cases where cylinder head removal and reinstallation is necessary, a revised tightening procedure should be followed on the 2010-2011 models. Ignoring this procedure may result in leaks.

2010-2011

Resolution: Follow the service procedures for tightening the cylinder head bolts, as a 3 step procedure. Ensure new cylinder head bolts are used.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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