Cadillac ATS 2013-2019 Exhaust System Bolt Torque Specifications & Gasket Sealing
Cadillac ATS 2013-2019

Cadillac ATS 2013-2019 Exhaust System Bolt Torque Specifications

Detailed torque specifications for exhaust system bolts on the 2013-2019 Cadillac ATS. Includes values for various exhaust 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

Exhaust Manifold

Components related to the exhaust manifold or headers, responsible for collecting exhaust gases from the cylinder head.

1

Exhaust Manifold to Cylinder Head Bolts

M10 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Always follow the specified torque sequence to ensure even pressure and prevent leaks.

Exhaust Connections

Bolted connections of the exhaust system, connecting the manifold to the catalytic converter and muffler.

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure bolts are properly aligned and threads are clean before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure all mating surfaces are clean and free from debris.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Check for correct alignment and that no stress is being placed on the exhaust system.

Exhaust Support

Components related to securing the exhaust system to the vehicle chassis, such as hangers and brackets.

1

Exhaust Hanger Bolts/Nuts to Chassis

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value, always check specific manual for exact value. Ensure hangers are properly aligned to prevent excessive vibration.

Sensors And Clamps

Components related to exhaust sensors and pipe clamps, requiring precise torque values for proper sealing and operation.

1

Oxygen Sensor

M18 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value, do not over-tighten. Ensure threads are clean and anti-seize is applied to the threads.
2

Exhaust Pipe Clamps

M8 x 1.25 (Clamp Bolt Size - Varies based on clamp)
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value, always check the specific clamp manufacturer for exact value. Tighten evenly to ensure a leak-free seal. This torque value is an estimation and the actual value may vary.

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 important for exhaust bolts?

Using the correct torque specification is crucial to ensure a proper seal and prevent exhaust leaks. Under-torquing can lead to leaks and rattling, while over-torquing can damage threads, gaskets, or even break the bolts. Leaks can introduce harmful carbon monoxide into the cabin, and looseness can cause damage to adjacent components.

Q2

What happens if I don't use a torque wrench?

While it may be tempting to 'guess' the torque, doing so risks under- or over-tightening. Under-tightening could result in leaks and component movement, causing damage and potential safety hazards. Over-tightening can permanently damage parts and the threaded holes, resulting in a much more expensive repair. A torque wrench provides the needed accuracy.

Q3

Should I use new exhaust bolts when reinstalling the system?

It is highly recommended to use new exhaust bolts whenever possible. Exhaust bolts are subject to high temperatures and vibration, which can stretch and weaken them over time. Replacing them ensures a fresh clamping force and reduces the chance of failure. New bolts often have thread locker pre-applied which will help them stay secure.

Q4

What kind of threadlocker should I use on exhaust bolts, if any?

If your bolts do not have pre-applied thread locker, using a high-temperature, medium-strength threadlocker (such as Loctite 242 or equivalent) is recommended. This helps prevent the bolts from loosening due to vibration and thermal cycling. Avoid using red (high-strength) threadlocker as it can make future removal very difficult.

Q5

What are the common torque specifications for exhaust bolts on a 2013-2019 Cadillac ATS?

Typical torque specifications for exhaust bolts on a 2013-2019 Cadillac ATS are generally in the range of 15-30 ft-lbs for manifold to head connections and 20-35 ft-lbs for pipe to pipe connections, as well as flanges to pipe connections. Always consult the specific repair manual for the exact torque figures for your vehicle as this varies based on the exact location. It's better to look it up than risk the damage.

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

A calibrated tool for applying specific torque to fasteners.

  • Variable torque settings
  • Audible click to indicate torque reached
Learn more

Socket Set

Set of sockets to fit various bolt and nut sizes found on the exhaust system.

  • Metric sizes
  • Various drive sizes (3/8", 1/2")
Learn more

Extension Bars

Used to reach difficult to access exhaust bolts.

  • Various lengths
  • Swivel attachments
Learn more
Service Procedures

Exhaust Manifold Bolt Torque Procedure

Procedure for properly tightening the exhaust manifold bolts on a Cadillac ATS.

  • Locate exhaust manifold bolts connecting the exhaust manifold to the engine cylinder head.
  • Use the appropriate socket and extension to access each bolt.
  • Tighten each bolt in a crisscross pattern to the first torque spec, typically 15 ft-lbs (20 Nm).
  • Then, tighten each bolt in the same crisscross pattern to the final torque spec, typically 22 ft-lbs (30 Nm).
  • Verify each bolt is at the final torque spec using the calibrated torque wrench.
View full procedure

Exhaust Pipe Flange Bolt Torque Procedure

Procedure for properly tightening the exhaust pipe flange bolts.

  • Locate the exhaust pipe flange bolts connecting exhaust sections.
  • Use the appropriate socket and extension to access each bolt.
  • Tighten each bolt to the recommended torque specification of 37 ft-lbs (50 Nm).
  • Verify each bolt is at the final torque spec using the calibrated torque wrench.
View full procedure

Catalytic Converter Bolt Torque Procedure

Procedure for properly tightening catalytic converter bolts to the exhaust manifold and mid pipe

  • Locate the catalytic converter bolts.
  • Use the appropriate socket and extension to access each bolt.
  • Tighten each bolt to the recommended torque specification, usually around 33 ft-lbs (45 Nm)
  • Verify each bolt is at the final torque spec using the calibrated torque wrench.
View full procedure
Technical Service Bulletins

Exhaust Manifold Bolt Loosening Issue

2016-05-10

Some 2013-2016 ATS models have reported issues with exhaust manifold bolts loosening over time.

2013-2016

Resolution: Inspect exhaust manifold bolts regularly and re-torque as needed. Use of thread locker may be required if bolts continue to loosen.

Exhaust Flange Gasket Leakage

2018-02-22

A small number of 2017-2019 ATS models have experienced exhaust flange gasket leaks due to improper installation or bolt torque.

2017-2019

Resolution: Ensure proper installation of new exhaust flange gaskets and torque bolts to specification. Always use new gaskets when reassembling.

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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