Cadillac SRX 2004-2009 4.6L Engine Bolt Torque Specifications & Fastener Values
Cadillac SRX 2004-2009

Cadillac SRX 2004-2009 4.6L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for various bolts on the 4.6L Northstar V8 engine found in the 2004-2009 Cadillac SRX. Includes cylinder head bolts, intake manifold bolts, exhaust manifold bolts, 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

Torque specifications for bolts securing the cylinder heads to the engine block. Proper torque sequence is crucial for even gasket compression and preventing leaks.

1

Cylinder Head Bolts

M11 x 1.5
Important Notes
Torque to yield bolts. Follow the specified sequence and torque angle. This is an estimated angle torque value based on common procedures.

Crankshaft

Torque specifications for the main bearing caps, connecting rod caps, and crankshaft pulley/harmonic balancer. These fasteners are critical for the engine's rotating assembly.

1

Main Bearing Bolts

M12 x 1.75
Important Notes
Torque to yield bolts. Follow the specified sequence and torque angle. This is an estimated angle torque value based on common procedures.
2

Connecting Rod Nuts

M10 x 1.5
Important Notes
Torque to yield fasteners. Follow the specified sequence and torque angle. This is an estimated angle torque value based on common procedures.
3

Flywheel Bolts

M10 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Ensure the flywheel is correctly aligned before tightening.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Important Notes
Torque to yield bolt. Follow the specified sequence and torque angle. This is an estimated angle torque value based on common procedures.

Oil System

Torque specifications for the oil pan, oil filter cap, oil drain plug, and oil filter housing. Proper sealing is vital to prevent oil leaks.

1

Oil Pan Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten in a cross pattern. Be careful not to overtighten.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use a new crush washer each time. Be careful not to overtighten.
3

Oil Filter Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only. Do not use tools. This component is a screw-on style and does not require a torque spec.
4

Oil Filter Housing Bolt

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tighten only. Do not use tools. This component is typically tightened by hand and does not require a specific torque spec. Ensure O-ring is properly seated

Valve Train

Torque specifications for valve covers, rocker arms, and camshaft sprockets. Proper torque is essential for valve train function and sealing.

1

Valve Cover Bolts

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Tighten in a cross pattern. Be careful not to overtighten.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
21 ft-lbs (28 N·m)
Important Notes
Tighten evenly.
3

Camshaft Sprocket Bolt

M12 x 1.5
Torque Value
103 ft-lbs (140 N·m)
Important Notes
Ensure proper timing alignment before tightening.

Timing System

Torque specifications for the timing chain tensioner. Maintaining proper tension is vital for valve timing.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tensioner function after tightening.

Intake System

Torque specifications for the intake manifold, throttle body, EGR valve, fuel rail, and fuel injector. These fasteners are crucial for proper air and fuel delivery.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in a crisscross pattern to avoid leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly.
3

EGR Valve Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly.
4

Fuel Rail Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Be careful not to overtighten.
5

Fuel Injector Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Be careful not to overtighten.

Exhaust System

Torque specifications for exhaust manifolds/headers. Proper torque is crucial for preventing exhaust leaks.

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in a center-outward sequence. Use new gaskets.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten evenly. Use new gaskets.

Cooling System

Torque specifications for the water pump, water pump pulley, and thermostat housing. Proper sealing is essential to prevent coolant leaks.

1

Water Pump Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly. Use a new gasket.
2

Water Pump Pulley Bolts

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

Thermostat Housing Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Use a new gasket.

Accessory Drive

Torque specifications for serpentine/accessory drive belt tensioner, idler pulley, alternator, power steering pump and A/C compressor. Proper tension and mounting are critical.

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper belt tensioner function after tightening.
2

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly.
3

Alternator Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten evenly.
4

Power Steering Pump Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten evenly.
5

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten evenly.

Electrical Sensors

Torque specifications for various engine sensors. Correct mounting is crucial for accurate readings.

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Be careful not to overtighten.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Be careful not to overtighten.
3

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Be careful not to overtighten.
4

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Tighten evenly.
5

Ignition Coil Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Be careful not to overtighten.

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 correct torque specifications important?

Correct torque specifications ensure proper clamping force, preventing leaks, loosening of bolts due to vibration, and damage to components. Over-torquing can strip threads or break bolts, while under-torquing can lead to leaks and premature failure. For example, incorrectly torquing a cylinder head bolt can result in head gasket failure and coolant leaks in the 4.6L engine.

Q2

What type of torque wrench should I use?

A reliable click-type or digital torque wrench is recommended for accurately achieving specified torque values. Be sure to calibrate your torque wrench periodically to maintain accuracy. Using a beam-type torque wrench can be acceptable, but they often lack the precision of other types, and the user must rely on their ability to accurately read a scale.

Q3

What should I do if I strip a bolt thread?

If a bolt thread is stripped, the affected component (e.g., engine block, cylinder head) will require repair. Options include using a thread repair kit (like a Heli-Coil), tapping the hole to a larger size and using a larger bolt, or, in severe cases, replacing the entire component. It's crucial to correctly repair threads in the 4.6L engine to maintain bolt strength and reliability.

Q4

Should I use new bolts when reassembling components?

It is generally recommended to use new bolts, particularly for critical components like the cylinder head bolts and connecting rod bolts, as they may stretch or fatigue during use, compromising their clamping strength and integrity for the 4.6L Northstar V8 engine.

Q5

What does 'torque-to-yield' mean, and does it apply to my 4.6L engine?

Torque-to-yield (TTY) bolts are designed to stretch a specific amount when tightened, providing the correct clamping force. Many bolts in the 4.6L engine are NOT torque-to-yield, however, the cylinder head bolts and main bearing cap bolts generally ARE TTY. If they are, they MUST be replaced each time they are removed, and proper procedures must be followed for correct installation to ensure proper clamping pressure, and prevent failure. Refer to the service manual for specific torque procedures.

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 for accurately tightening bolts to specified torque values.

  • Wide torque range (e.g., 20-250 ft-lbs)
  • Click-type or digital readout
  • 1/2" drive for standard sockets
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for applications requiring lower torque values.

  • Torque range suitable for smaller bolts (e.g., 5-80 ft-lbs)
  • Click-type or digital readout
  • 3/8" drive for smaller sockets
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various bolt heads on the 4.6L engine.

  • Variety of sizes, including commonly used sizes for engine work (e.g., 8mm-24mm)
  • 6-point design for a better grip
  • Durable construction
Learn more

Socket Extensions

Extensions of various lengths to allow access to bolts in hard-to-reach areas.

  • Different lengths available (e.g., 3", 6", 10")
  • Durable construction
  • Secure connection to socket and wrench
Learn more

Universal Joint Socket Adapter

Adapters to allow sockets to be used at an angle for hard to reach fasteners

  • Durable construction
  • Secure connection to socket and wrench
  • Smooth operation
Learn more
Service Procedures

Intake Manifold Bolt Torque Procedure (4.6L)

Procedure for tightening the intake manifold bolts on the 4.6L engine.

  • Locate all intake manifold bolts.
  • Install all intake manifold bolts by hand.
  • Using the specified sequence in a service manual, tighten all bolts to 89 lb-in (10 Nm) in a 2-step sequence.
  • Using the same sequence, tighten all bolts to 18 lb-ft (25 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Cylinder Head Bolt Torque Procedure (4.6L)

Procedure for tightening the cylinder head bolts on the 4.6L engine.

  • Locate all cylinder head bolts.
  • Install all cylinder head bolts by hand.
  • Using the specified sequence, tighten all bolts to 22 lb-ft (30 Nm).
  • Using the same sequence, tighten all bolts to an additional 90 degrees.
  • Using the same sequence, tighten all bolts to an additional 70 degrees.
  • Verify all bolts are torqued to specification.
View full procedure

Camshaft Bearing Cap Bolt Torque Procedure (4.6L)

Procedure for tightening the camshaft bearing cap bolts on the 4.6L engine.

  • Locate all camshaft bearing cap bolts.
  • Install all camshaft bearing cap bolts by hand.
  • Using the specified sequence, tighten all bolts to 89 lb-in (10 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Oil Pan Bolt Torque Procedure (4.6L)

Procedure for tightening the oil pan bolts on the 4.6L engine.

  • Locate all oil pan bolts.
  • Install all oil pan bolts by hand.
  • Using the specified sequence, tighten all bolts to 18 lb-ft (25 Nm).
  • Verify all bolts are torqued to specification.
View full procedure

Exhaust Manifold Bolt Torque Procedure (4.6L)

Procedure for tightening the exhaust manifold bolts on the 4.6L engine.

  • Locate all exhaust manifold bolts.
  • Install all exhaust manifold bolts by hand.
  • Using the specified sequence, tighten all bolts to 18 lb-ft (25 Nm).
  • Verify all bolts are torqued to specification.
View full procedure
Technical Service Bulletins

Engine Ticking Noise - Cylinder Head Bolt Re-Torque

2006-05-15

Some 2004-2006 models have been found to exhibit a ticking noise originating from the cylinder heads. This noise is often caused by improper cylinder head bolt clamping.

2004-2006 SRX with 4.6L Engine

Resolution: Verify cylinder head bolts are at the correct torque specification. Re-torque bolts to the specified torque and angle, using proper torque sequence. Follow a detailed torqueing procedure provided by the OEM.

Intake Manifold Gasket Leakage - Bolt Torque Specification

2007-12-01

Certain 2006-2008 SRX vehicles with the 4.6L engine may experience intake manifold gasket leaks. This could be due to incorrect bolt torquing during assembly or previous service.

2006-2008 SRX with 4.6L Engine

Resolution: Inspect intake manifold bolts and gaskets for leaks. Replace gaskets as needed, then ensure bolts are tightened to 18 lb-ft (25 Nm) using the correct sequence. Always torque in a 2 step process as outlined in the service procedure.

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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