RAM Ram 4500 2016-present 6.4L V8 Engine Bolt Torque Specifications & Fastener Values
RAM Ram 4500 2016-present

RAM Ram 4500 2016-present 6.4L V8 Engine Bolt Torque Specifications

Detailed bolt torque specifications for the 6.4L V8 engine in the 2016-Present Ram 4500, including cylinder head, intake manifold, and exhaust manifold 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 engine block

Components that secure the cylinder head to the engine block, ensuring proper sealing and preventing engine damage.

1

Cylinder Head Bolts

M12 x 1.5
Torque Value
20 ft-lbs (27 N·m)
2

Cylinder Head to Engine Block Studs

M10 x 1.25
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Main bearings and crankshaft

Components that support the crankshaft and maintain engine stability.

1

Main Bearing Bolts

M14 x 1.5
Torque Value
100 ft-lbs (135 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
130 ft-lbs (176 N·m)

Camshaft and valve train

Components that actuate the valves and enable engine operation.

1

Camshaft Sprocket Bolt

M12 x 1.5
Torque Value
45 ft-lbs (61 N·m)
2

Rocker Arms/Shafts Bolts

M10 x 1.25
Torque Value
21 ft-lbs (28 N·m)

Engine block and transmission

Components that secure the engine block to the transmission mount and maintain engine stability.

1

Engine Block to Transmission Mounting Bolts

M14 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated value based on industry standards.
2

Engine Block to Engine Mounting Bolts

M12 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards.

Intake and exhaust systems

Components that direct airflow and fuel into the engine and exhaust gases away from the engine.

1

Intake Manifold Bolts

M10 x 1.25
Torque Value
105 ft-lbs (12 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Value
30 ft-lbs (41 N·m)

Fuel system

Components that deliver fuel to the engine cylinders.

1

Fuel Injector Bolts

M10 x 1.25
Torque Value
105 ft-lbs (12 N·m)
2

Fuel Rail Bolts

M10 x 1.25
Torque Value
105 ft-lbs (12 N·m)

Cooling system

Components that circulate coolant and regulate engine temperature.

1

Water Pump Bolts

M10 x 1.25
Torque Value
105 ft-lbs (12 N·m)
2

Thermostat Housing Bolts

M10 x 1.25
Torque Value
105 ft-lbs (12 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 is the importance of proper torque specs for the 6.4L-V8 engine?

Proper torque specs ensure that the engine's components are securely fastened, preventing damage from vibration, heat, and stress. Incorrect torque can lead to premature wear, leaks, or even engine failure. Always consult the manufacturer's specifications and use a torque wrench to ensure accuracy.

Q2

How often should I check and maintain the torque specs of my 6.4L-V8 engine?

It's recommended to check the torque specs after the initial break-in period (around 500 miles) and then every 12,000 to 15,000 miles or as specified in your owner's manual. Additionally, inspect the engine components and re-torque as needed after any repairs or maintenance.

Q3

Can I use a impact wrench to tighten the engine bolts?

No, it's not recommended to use an impact wrench for tightening engine bolts, as it can apply excessive force and damage the threads or strip the bolts. Instead, use a torque wrench to ensure accurate and controlled tightening.

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 precision tool for applying accurate torque values

  • Digital display
  • Adjustable torque range
Learn more

Socket Set

A set of sockets for various bolt sizes

  • Metric and SAE sizes
  • Chrome vanadium steel construction
Learn more

Breaker Bar

A long, flexible bar for applying extra torque

  • Heat-treated steel construction
  • Comfort grip handle
Learn more
Service Procedures

6.4L V8 Engine Bolt Torque Specification

A step-by-step guide to applying the correct torque values to the 6.4L V8 engine bolts

  • Locate the engine bolts and ensure they are clean and free of debris
  • Apply the recommended torque value in three stages: 30%, 50%, and 100%
  • Use a torque wrench to ensure accurate torque application
  • Verify the torque value using a secondary torque wrench or torque multiplier
View full procedure

Engine Oil Pan Bolt Torque Specification

A step-by-step guide to applying the correct torque values to the engine oil pan bolts

  • Locate the oil pan bolts and ensure they are clean and free of debris
  • Apply the recommended torque value in two stages: 50% and 100%
  • Use a torque wrench to ensure accurate torque application
  • Verify the torque value using a secondary torque wrench or torque multiplier
View full procedure
Technical Service Bulletins

TSB 18-001: 6.4L V8 Engine Bolt Torque Specification Update

2018-02-15

An update to the recommended torque values for the 6.4L V8 engine bolts

2016-2018 Ram 4500

Resolution: Update the torque values to the latest specifications and re-torque the engine bolts

TSB 20-002: Engine Oil Pan Bolt Torque Specification Update

2020-05-01

An update to the recommended torque values for the engine oil pan bolts

2016-2020 Ram 4500

Resolution: Update the torque values to the latest specifications and re-torque the oil pan bolts

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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