Lexus LS 2007-2017 4.6L V8 Hybrid Engine Bolt Torque Specifications & Fastener Values
Lexus LS 2007-2017

Lexus LS 2007-2017 4.6L V8 Hybrid Engine Bolt Torque Specifications

Detailed bolt torque specifications for the 4.6L V8 hybrid engine in the 2007-2017 Lexus LS. Includes cylinder head, main bearing, connecting rod, and other critical torque values.

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 valvetrain

Components that secure the cylinder head, valves, and valvetrain to the engine block.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
26 ft-lbs (35 N·m)
2

Valve Cover Bolts

M8 x 1.25
Torque Value
7 ft-lbs (10 N·m)
3

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Value
14 ft-lbs (19 N·m)

Engine block and bearings

Components that secure the engine block, main bearings, and connecting rods.

1

Main Bearing Bolts

M14 x 2.0
Torque Value
27 ft-lbs (37 N·m)
2

Connecting Rod Nuts

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)

Crankshaft and flywheel

Components that secure the crankshaft, flywheel, and harmonic balancer.

1

Flywheel Bolts

M16 x 2.0
Torque Value
61 ft-lbs (83 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M20 x 2.5
Torque Value
159 ft-lbs (216 N·m)

Intake and exhaust manifolds

Components that secure the intake and exhaust manifolds to the engine block.

1

Intake Manifold Bolts

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.75
Torque Value
26 ft-lbs (35 N·m)

Timing and accessory components

Components that secure the timing belt/chain, water pump, and other accessories.

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.75
Torque Value
27 ft-lbs (37 N·m)
2

Water Pump Bolts

M10 x 1.5
Torque Value
9 ft-lbs (12 N·m)
3

Water Pump Pulley Bolts

M10 x 1.5
Torque Value
9 ft-lbs (12 N·m)

Hybrid system components

Components that secure the hybrid system control module, electric motor, and high-voltage battery.

1

Hybrid System Control Module Mounting Bolts

M12 x 1.75
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on general industry standards.
2

Electric Motor Mounting Bolts

M14 x 2.0
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on general industry standards.
3

High-Voltage Battery Mounting Bolts

M14 x 2.0
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on general industry standards.

Other components

Components that secure the oil pan, oil filter housing, and other accessories.

1

Oil Pan Bolts

M10 x 1.5
Torque Value
71 in-lbs (8 N·m)
2

Oil Filter Housing Bolt

M12 x 1.75
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand tight only.

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 the 4.6L V8 hybrid engine?

The cylinder head bolts on the 4.6L V8 hybrid engine should be torqued in three stages: first to 22 lb-ft, then to 44 lb-ft, and finally an additional 90-degree turn. Always follow the manufacturer's sequence to avoid warping the cylinder head.

Q2

How often should I check the torque on engine components?

Torque checks should be performed during routine maintenance or after any major engine work. For the 4.6L V8 hybrid engine, it's recommended to inspect torque settings every 30,000 miles or as specified in the owner's manual.

Q3

Can I reuse bolts on the 4.6L V8 hybrid engine?

Some bolts, like cylinder head bolts, are torque-to-yield (TTY) and should not be reused. Always replace TTY bolts with new ones to ensure proper clamping force and avoid 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 accurate torque to engine bolts.

  • Adjustable torque settings
  • LCD display for real-time torque readings
Learn more

Torque Angle Gauge

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

  • Magnetic base for easy attachment
  • 360-degree rotation measurement
Learn more

Engine Bolt Torque Sequence Guide

A reference guide for the correct bolt tightening sequence.

  • Specific to 4.6L V8 Hybrid Engine
  • Includes torque specifications for all critical bolts
Learn more
Service Procedures

Cylinder Head Bolt Torque Procedure

Detailed steps for torquing cylinder head bolts on the 4.6L V8 Hybrid Engine.

  • Clean bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the bolt threads.
  • Tighten bolts in the specified sequence to 30 Nm (22 ft-lb).
  • Turn each bolt an additional 90 degrees in the specified sequence.
  • Finally, turn each bolt another 90 degrees in the specified sequence.
View full procedure

Main Bearing Cap Bolt Torque Procedure

Steps for torquing main bearing cap bolts on the 4.6L V8 Hybrid Engine.

  • Clean bolt threads and bolt holes thoroughly.
  • Apply a small amount of engine oil to the bolt threads.
  • Tighten bolts in the specified sequence to 25 Nm (18 ft-lb).
  • Turn each bolt an additional 90 degrees in the specified sequence.
View full procedure
Technical Service Bulletins

Incorrect Torque Application on Cylinder Head Bolts

2015-03-12

Reports of engine misfires and coolant leaks due to improperly torqued cylinder head bolts.

2007-2015 Lexus LS 600h

Resolution: Follow the updated torque procedure and ensure all bolts are tightened to the correct specification.

Main Bearing Cap Bolt Failure

2016-08-22

Instances of main bearing cap bolt failure leading to engine damage.

2007-2017 Lexus LS 600h

Resolution: Replace all main bearing cap bolts and follow the revised torque procedure.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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