Cadillac ATS 2013-2019 2.5L Engine Bolt Torque Specifications & Fastener Values
Cadillac ATS 2013-2019

Cadillac ATS 2013-2019 2.5L Engine Bolt Torque Specifications

Comprehensive list of torque specifications for bolts used in the 2.5L engine of the 2013-2019 Cadillac ATS, including cylinder head, crankshaft, connecting rod, and other critical engine components.

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

Components related to the cylinder head, including bolts for mounting and associated components. Critical for combustion sealing and engine performance. Always follow torque sequences.

1

Cylinder Head Bolts (Initial Torque)

M12 x 1.75
Important Notes
Initial torque value. Final tightening is performed using angle measurements. Always use new bolts. It is critical to follow the proper tightening sequence, typically starting from the center and working outwards in a spiral pattern. Estimated angle values, refer to the specific service manual for your vehicle.
2

Camshaft Cap/Bearing Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value, tighten in the correct sequence, typically from the center out. Ensure proper cam alignment.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the rocker arm assembly to the cylinder head.
4

Valve Cover Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the valve cover to the cylinder head. Use a gasket and tighten evenly to prevent leaks. 89 inch-lbs converted to ft-lbs.
5

Ignition Coil Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the ignition coils to the valve cover or cylinder head. 89 inch-lbs converted to ft-lbs.
6

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the exhaust manifold to the cylinder head. Tighten in sequence, starting from the center outwards. Always use new gaskets.

Engine Block

Components directly mounted to or contained within the engine block, including main bearings, oil pan, and water pump.

1

Main Bearing Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the main bearing caps to the engine block. Tighten in the correct sequence to ensure even clamping and crankshaft alignment.
2

Oil Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the oil pan to the engine block. Use a new gasket or sealant. 106 inch-lbs converted to ft-lbs.
3

Water Pump Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the water pump to the engine block. Use a new gasket. 106 inch-lbs converted to ft-lbs.
4

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the water pump pulley to the water pump. 106 inch-lbs converted to ft-lbs.
5

Oil Filter Housing Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the oil filter housing to the engine block. 89 inch-lbs converted to ft-lbs.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Seals the oil drain opening in the oil pan. Use a new crush washer. Overtightening can damage the oil pan.
7

Thermostat Housing Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the thermostat housing to the engine block or cylinder head. Use a new gasket. 106 inch-lbs converted to ft-lbs.

Rotating Assembly

Components related to the rotating parts of the engine, including the crankshaft, connecting rods, and flywheel.

1

Connecting Rod Nuts

M9 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Secures the connecting rod caps to the connecting rods. Ensure proper bearing alignment. Use new nuts if specified.
2

Flywheel Bolts

M11 x 1.25
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Attaches the flywheel to the crankshaft. Use new bolts, and always use the correct torque sequence.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Secures the crankshaft pulley/harmonic balancer to the crankshaft. Check for specific torque procedures, which may include angle tightening in a specific sequence.

Timing System

Components related to the timing system, including the tensioner and camshaft sprockets.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Secures the timing tensioner. Ensure correct belt or chain tensioning after installation.
2

Camshaft Sprocket Bolts

M10 x 1.25
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the camshaft sprockets to the camshafts. Verify proper timing alignment.

Intake System

Components related to the engine's intake system, including the intake manifold, throttle body and associated sensors.

1

Intake Manifold Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the intake manifold to the cylinder head. Tighten in a specific sequence from the center out. Always use new gaskets or seals.
2

Throttle Body Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Attaches the throttle body to the intake manifold. 89 inch-lbs converted to ft-lbs.
3

Intake Air Temperature Sensor (IAT) Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secure the IAT sensor. Estimated Value. Some IAT sensors use a tapered thread instead of a bolt. 89 inch-lbs converted to ft-lbs.

Fuel System

Components related to the engine's fuel delivery system, including the fuel rail and injectors.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the fuel rail to the intake manifold. 89 inch-lbs converted to ft-lbs.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the fuel injectors. 89 inch-lbs converted to ft-lbs.

Emission System

Components related to the engine's emission control system, including the EGR valve.

1

EGR Valve Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Attaches the EGR valve to the intake or exhaust manifold. Use a new gasket or seal if required. 89 inch-lbs converted to ft-lbs.

Sensor System

Components related to various sensors used by the engine management system.

1

Crankshaft Position Sensor (CKP) Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the CKP sensor to the engine block. Estimated value. 89 inch-lbs converted to ft-lbs.
2

Knock Sensor Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the knock sensor. Estimated Value.
3

Coolant Temperature Sensor/Sender Bolt

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the coolant temperature sensor. Estimated Value. Some coolant temp sensors use a tapered thread, not a bolt. 106 inch-lbs converted to ft-lbs.
4

Variable Valve Timing (VVT) Solenoid Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the VVT solenoid to the engine. Estimated Value. 89 inch-lbs converted to ft-lbs.

Engine Mounts

Components related to securing the engine to the chassis, including various engine mounts and their fasteners.

1

Engine Mount Bolts (General)

M10 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Secures engine mounts to the engine and chassis. Actual torque can vary based on location. Estimated value within the range of 37 - 70 ft-lbs, but 55 is a good median. Always refer to specific service manual.

Spark Plugs

Torque specification for installing spark plugs into the cylinder head.

1

Spark Plugs Torque

M14 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensures proper heat transfer and a good seal. Over-tightening can damage the cylinder head. Use anti-seize compound on threads if specified.

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 important for the 2.5L engine?

Using the correct torque specifications is crucial to ensure proper clamping force, preventing leaks, component damage, and potential engine failure. Overtightening bolts can lead to thread stripping or component fractures, while under-tightening can cause leaks and vibrations. For example, an improperly torqued intake manifold bolt might result in vacuum leaks, leading to poor engine performance.

Q2

What tools are required to properly torque bolts on the 2.5L engine?

You'll need a calibrated torque wrench (in foot-pounds or Newton-meters), a socket set (including the appropriate sizes), and potentially extension bars. It's highly recommended to use a digital torque wrench for accurate readings. A torque angle gauge may also be needed for some procedures. For example, when installing the cylinder head, torque angle is crucial.

Q3

What should I do if I strip a bolt thread on the 2.5L engine?

If you strip a bolt thread, the best practice is to repair it with a thread repair kit (like a Helicoil) or by replacing the component with the damaged threads. Ignoring it and attempting to torque into a stripped thread is very dangerous and can lead to component failure and engine damage. If the thread damage is extensive, seeking professional help may be necessary.

Q4

Where can I find the exact torque specifications for a specific bolt on the 2.5L engine?

Always refer to the official Cadillac service manual for your specific model year. Online resources may provide general guidance, but for precise torque figures, the manual is the most reliable source. The manual will often list torque in foot-pounds (ft-lbs) or Newton-meters (Nm), and sometimes include torque-to-yield information.

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 with a 1/2" drive for applying precise torque values to larger fasteners.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Click-type or digital readout for accuracy
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench with a 3/8" drive for applying precise torque values to smaller fasteners.

  • Smaller torque range (e.g., 5-80 ft-lbs)
  • Click-type or digital readout for accuracy
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit the fasteners on the 2.5L engine.

  • Includes deep and standard sockets
  • Common sizes: 8mm, 10mm, 13mm, 15mm, 17mm, 18mm
Learn more

Socket Extensions

Various length socket extensions to reach fasteners in recessed or hard-to-access areas on the engine.

  • Variety of lengths (e.g., 3", 6", 10")
  • Provides added reach for torque applications
Learn more

Universal Joint Adapter

A universal joint adapter that allows the socket and wrench to be used at an angle.

  • Flexibility to access bolts at angles
  • Maintains torque application
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

This procedure outlines how to properly torque the cylinder head bolts on the 2.5L engine. Failure to follow this procedure may cause damage to the engine.

  • Clean all bolt threads and holes.
  • Install the cylinder head and new head bolts, hand tighten.
  • Torque all bolts to 22 lb-ft (30 Nm).
  • Using a torque angle meter, angle tighten all bolts 80 degrees.
  • Using a torque angle meter, angle tighten all bolts an additional 70 degrees.
View full procedure

Intake Manifold Bolt Torque Procedure

This procedure outlines the proper torque specifications for the intake manifold bolts on the 2.5L engine.

  • Clean all bolt threads and holes.
  • Install the intake manifold and hand tighten the bolts.
  • Torque bolts to 89 in-lbs (10 Nm).
  • Visually inspect to ensure proper manifold alignment.
  • Verify torque after 10 minutes
View full procedure

Exhaust Manifold Bolt Torque Procedure

This procedure outlines the proper torque specifications for the exhaust manifold bolts on the 2.5L engine.

  • Clean all bolt threads and holes.
  • Install the exhaust manifold and hand tighten the bolts.
  • Torque bolts to 18 lb-ft (25 Nm).
  • Visually inspect to ensure proper manifold alignment.
  • Verify torque after 10 minutes.
View full procedure

Camshaft Bearing Cap Bolt Torque Procedure

This procedure outlines the proper torque specifications for the camshaft bearing cap bolts on the 2.5L engine.

  • Clean all bolt threads and holes.
  • Install the camshaft bearing caps and hand tighten the bolts.
  • Torque bolts to 89 in-lbs (10 Nm).
  • Visually inspect to ensure proper alignment and bearing support.
  • Verify torque after 10 minutes.
View full procedure
Technical Service Bulletins

Engine Oil Leak From Cylinder Head Bolt

2017-04-15

Some 2.5L engines may experience an oil leak originating from the cylinder head bolt area. This bulletin addresses the proper torque procedure and a possible bolt replacement.

2013-2017

Resolution: Verify the head bolts are torqued to spec and replace any damaged bolts. Refer to proper head bolt torque procedure

Intake Manifold Warping Causing Vacuum Leak

2018-09-20

A vacuum leak may occur due to the intake manifold warping, check for proper bolt torque and inspect for warping of the manifold surface. Follow correct installation procedure.

2015-2019

Resolution: Inspect intake manifold for warpage, replace if necessary. Ensure bolts are torqued to specification using a calibrated torque wrench. Refer to proper intake manifold installation 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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