Cadillac STS 2005-2011 4.6L Engine Bolt Torque Specifications & Fastener Values
Cadillac STS 2005-2011

Cadillac STS 2005-2011 4.6L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 4.6L engine of the 2005-2011 Cadillac STS, essential for proper engine assembly and maintenance.

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 related to the cylinder head and its components.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Torque-to-yield bolts require specific sequence and angle tightening. Follow the factory service manual procedure precisely. First pass is a torque value, then 2 passes each with a specified angle.
2

Valve Cover Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten evenly to prevent leaks.
3

Valve Cover Gasket Retainer Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, torque to same as valve cover bolts. Ensure proper gasket alignment.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Ensure even tightening to prevent exhaust leaks. Use a multi-step tightening process with a cross-tightening pattern.
5

Spark Plugs

M14 x 1.25
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Tighten to specified torque to ensure proper sealing and heat transfer. Do not over-tighten to avoid thread damage.
6

Rocker Arm Shaft Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure rocker arm alignment during tightening.
7

Ignition Coil Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten. Ensure proper coil seating.
8

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar sensors, may vary. Ensure proper sensor seating before torquing
9

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to ensure a leak-free seal.

Engine Block

Specifications for bolts related to the engine block and its internal components.

1

Main Bearing Bolts

M12 x 1.75
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Tighten bolts in sequence. Use a multi-step tightening process.
2

Connecting Rod Nuts

M9 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten in steps to ensure even pressure.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten evenly to prevent oil leaks. Use a criss-cross pattern.
4

Oil Pump Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value, check service manual. Tighten evenly to ensure proper function.
5

Knock Sensor Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value, torque to similar to sensors to ensure proper contact.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper sealing with a new washer.

Rotating Assembly

Specifications for bolts related to the rotating components of the engine.

1

Flywheel Bolts

M10 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Use a holding tool to prevent crankshaft rotation. Ensure the pulley is fully seated before tightening.
3

Camshaft Sprocket Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure camshaft is properly timed before tightening. Use a multi-step tightening pattern.

Timing System

Specifications for bolts related to the timing components.

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten to prevent movement. Always ensure proper tensioning after installation.

Intake System

Specifications for bolts related to the intake system and its components.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten evenly to prevent vacuum leaks. Use a multi-step cross pattern tightening sequence.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Tighten evenly to prevent vacuum leaks.
3

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Do not over tighten. Ensure fuel rail is properly seated.
4

Fuel Injector Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure injectors are properly seated. Do not over-tighten.
5

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, torque to similar sensors to ensure proper readings.
6

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Estimated value, torque to similar sensors to ensure proper readings.

Cooling System

Specifications for bolts related to the cooling system and its components.

1

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper seal to prevent coolant leaks. Tighten evenly.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper alignment with water pump.
3

Thermostat Housing Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly to prevent coolant leaks. Ensure proper gasket is installed.

Accessory Drive

Specifications for bolts related to the accessory drive system.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Securely mount the tensioner for proper belt tension.
2

Drive Belt Idler Pulley Bolt

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

Other

Specifications for miscellaneous bolts and fasteners.

1

Fuel Filter Bolt/Nut

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Ensure proper filter mounting.

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 so important?

Using the correct torque specification ensures proper clamping force, preventing bolts from loosening due to vibration or thermal expansion. Overtightening can damage threads, distort components, or even break bolts, while undertightening can cause leaks or component failure. For example, overtightening a cylinder head bolt can warp the head, leading to compression issues and engine damage.

Q2

Should I use new bolts every time I remove them?

While not always mandatory, it's highly recommended to use new bolts, especially for critical components like cylinder head bolts or connecting rod bolts. These bolts may stretch or yield after being torqued, and reusing them can lead to inaccurate torque readings and potential failure. For instance, reusing a stretch bolt on the crankshaft can lead to bearing failure.

Q3

What is 'torque-to-yield' and does it apply to this engine?

Torque-to-yield (TTY) bolts are designed to stretch a specific amount when tightened, achieving optimal clamping force. The 4.6L Northstar engine in the 2005-2011 Cadillac STS uses TTY bolts in critical areas. These bolts MUST be replaced after each use; they cannot be reused. For example, cylinder head bolts and main bearing bolts are TTY bolts on this engine.

Q4

What is the best way to apply torque to these bolts?

Use a calibrated torque wrench, and always follow the manufacturer's recommended tightening sequence. Tighten the bolts in multiple passes, gradually reaching the final torque value. Avoid applying torque in a single pass, as this can lead to uneven clamping. An example is a cylinder head: start from the center and work outwards in a spiral pattern and follow the torque sequence specified by GM.

Q5

Do I need to apply any lubricant to the threads before tightening?

Yes, for certain bolts, especially cylinder head bolts, a light coat of clean engine oil is typically applied. However, some bolts are designed to be torqued dry, always consult the service manual for the specific application for proper use. Failure to do so may lead to inaccurate torque readings, which can cause issues, even if using a torque wrench.

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 the specified torque values, preventing damage or loosening.

  • Wide torque range to cover all engine fasteners
  • Click-type or digital display for accurate readings
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for fasteners with a lower torque spec.

  • Lower torque range for smaller fasteners
  • Click-type or digital display for accurate readings
  • Durable construction
Learn more

Socket Set (Metric)

A comprehensive metric socket set is needed to fit all bolts on the 4.6L engine.

  • Includes a variety of sizes for various bolts
  • Durable and high-quality materials
  • Both standard and deep sockets
Learn more

Extension Bars

Extension bars are helpful in reaching difficult to access fasteners.

  • Various lengths for hard-to-reach bolts
  • Durable construction
  • Securely connects to sockets
Learn more

Universal Joint Adapter

Universal joint adapter is useful for odd angle fasteners.

  • Allows sockets to operate at an angle
  • Durable construction
  • Secure connection
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Proper tightening of cylinder head bolts is crucial for maintaining a tight seal. Follow this multi-step process.

  • Clean all bolt holes thoroughly.
  • Lightly lubricate bolt threads with engine oil.
  • Install cylinder head and install all bolts hand tight.
  • Tighten all bolts in sequence to the first torque spec.
  • Tighten all bolts in sequence to the second torque spec.
  • Turn all bolts in sequence the final angle spec.
View full procedure

Intake Manifold Bolt Torque Procedure

This procedure ensures proper intake manifold sealing.

  • Clean all mating surfaces and bolt holes.
  • Install the intake manifold and all bolts hand tight.
  • Tighten all bolts in sequence to the specified torque.
  • Inspect the seal after torquing
View full procedure

Exhaust Manifold Bolt Torque Procedure

Correct exhaust manifold bolt torque is essential to prevent leaks.

  • Clean all mating surfaces and bolt holes.
  • Install the exhaust manifold and all bolts hand tight.
  • Tighten all bolts in sequence to the specified torque.
  • Inspect the manifold for a flush fit
View full procedure

Camshaft Bearing Cap Bolt Torque Procedure

Proper camshaft bearing cap bolt torque is crucial for maintaining proper camshaft function.

  • Clean all mating surfaces and bolt holes.
  • Install the camshaft bearing caps and all bolts hand tight.
  • Tighten all bolts in sequence to the specified torque.
  • Inspect the camshaft for proper fit
View full procedure
Technical Service Bulletins

Engine Oil Leak at Cylinder Head Gasket

2008-07-15

Some 2005-2007 models have experienced oil leaks due to improper cylinder head bolt torque.

2005-2007 Cadillac STS with 4.6L Engine

Resolution: Inspect cylinder head bolt torque. Remove and replace gasket if necessary. Torque head bolts per the service procedure.

Intake Manifold Gasket Leak

2010-03-20

Some 2007-2011 models have had intake manifold leaks due to incorrect bolt torquing during assembly.

2007-2011 Cadillac STS with 4.6L Engine

Resolution: Inspect intake manifold bolts for proper torque. Replace gasket if necessary. Torque bolts per the service procedure.

Exhaust Manifold Bolt Loosening

2009-11-10

Some 2006-2009 vehicles may experience exhaust leaks due to exhaust manifold bolt loosening.

2006-2009 Cadillac STS with 4.6L Engine

Resolution: Inspect exhaust manifold bolts for proper torque. Torque to spec per service procedure. Replace bolts if necessary

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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