Hyundai Sonata 2015-2019 2.4L Engine Bolt Torque Specifications & Fastener Values
Hyundai Sonata 2015-2019

Hyundai Sonata 2015-2019 2.4L Engine Bolt Torque Specifications

Detailed torque specifications for the 2.4L engine bolts in the 2015-2019 Hyundai Sonata, 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 and valve train

Components that secure the cylinder head, valve train, and related accessories.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
18 ft-lbs (25 N·m)
2

Valve Cover Bolts

M8 x 1.25
Torque Value
53 inch-lbs (6 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)

Engine block and main bearings

Components that secure the engine block, main bearings, and related accessories.

1

Main Bearing Bolts

M14 x 2.0
Torque Value
62 ft-lbs (84 N·m)
2

Engine Block to Transmission Mounting Bolts

M16 x 2.0
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Estimated value, verify with manufacturer's specifications.

Crankshaft and connecting rods

Components that secure the crankshaft, connecting rods, and related accessories.

1

Connecting Rod Nuts

M12 x 1.5
Torque Value
32 ft-lbs (44 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 2.5
Torque Value
159 ft-lbs (216 N·m)

Intake and exhaust systems

Components that secure the intake manifold, exhaust manifold, and related accessories.

1

Intake Manifold Bolts

M10 x 1.5
Torque Value
18 ft-lbs (25 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Value
29 ft-lbs (39 N·m)

Accessories and miscellaneous

Components that secure various accessories and miscellaneous parts.

1

Flywheel Bolts

M14 x 2.0
Torque Value
94 ft-lbs (127 N·m)
2

Oil Pan Bolts

M10 x 1.5
Torque Value
71 inch-lbs (8 N·m)
3

Spark Plugs

14mm x 1.25
Torque Value
15 ft-lbs (20 N·m)

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

What are the torque specifications for the cylinder head bolts on a 2015-2019 Hyundai Sonata 2.4L engine?

The cylinder head bolts on the 2.4L engine should be torqued in a specific sequence to 25 Nm (18 lb-ft) initially, then tightened an additional 90 degrees in the specified sequence. Always refer to the manufacturer's service manual for the exact sequence and final torque values.

Q2

How often should I check the torque on engine components?

Torque checks are typically performed during major maintenance intervals, such as when replacing gaskets, seals, or after engine repairs. For the 2.4L engine, it's recommended to verify torque specifications after 500-1,000 miles following any engine work to ensure bolts remain properly tightened.

Q3

Can I reuse cylinder head bolts on the 2.4L engine?

No, the cylinder head bolts on the 2.4L engine are torque-to-yield (TTY) bolts and should not be reused. These bolts are designed to stretch during installation and must be replaced with new ones to ensure proper clamping force and prevent leaks or engine 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

Digital Torque Wrench

A precision tool for applying specific torque values to bolts.

  • Adjustable torque settings
  • Digital display for accurate readings
Learn more

Torque Angle Gauge

Used to measure the angle of rotation when torque-to-yield bolts are used.

  • Magnetic base for easy attachment
  • Clear angle markings
Learn more

Socket Set

A set of sockets for various bolt sizes, including those used in the 2.4L engine.

  • Includes both metric and standard sizes
  • Durable construction
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing the cylinder head bolts on the 2.4L engine.

  • Clean the bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the threads and under the bolt heads.
  • Tighten the bolts in the specified sequence to the initial torque value.
  • Using a torque angle gauge, rotate the bolts to the specified angle in the correct sequence.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Steps for torquing the main bearing cap bolts on the 2.4L engine.

  • Ensure the bearing caps and engine block are clean and free of debris.
  • Apply engine oil to the bolt threads and under the bolt heads.
  • Tighten the bolts in the specified sequence to the initial torque value.
  • Rotate the bolts to the specified angle using a torque angle gauge.
View full procedure
Technical Service Bulletins

Engine Bolt Torque Specification Update

2017-05-15

Updated torque specifications for certain engine bolts in the 2.4L engine.

2015-2019 Hyundai Sonata

Resolution: Refer to the updated torque specifications in the service manual and ensure all bolts are torqued correctly.

Cylinder Head Bolt Failure Notice

2018-09-10

Reports of cylinder head bolt failures due to incorrect torque application.

2015-2019 Hyundai Sonata

Resolution: Follow the updated torque procedure and use a torque angle gauge to ensure proper bolt tightening.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Hyundai Specs. All rights reserved.

Privacy Policy Terms of Service