Chrysler 300 2005-2010 2.7L Engine Bolt Torque Specifications & Fastener Values
Chrysler 300 2005-2010

Chrysler 300 2005-2010 2.7L Engine Bolt Torque Specifications

Comprehensive guide to bolt torque specifications for the 2.7L engine in the 2005-2010 Chrysler 300. Includes torque values for various 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

Bolts and fasteners related to the cylinder head and its components. Includes cylinder head bolts, rocker arms, and related items.

1

Cylinder Head Bolts

M12 x 1.75
Important Notes
Follow the specific tightening sequence provided in the service manual for the 2.7L engine. This is crucial for proper sealing and to prevent head warping.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Value
21 ft-lbs (28 N·m)
Important Notes
Ensure rocker arm shafts are properly seated before torquing. Improper torque can lead to valve train issues.

Engine Block

Bolts and fasteners related to the engine block, including main bearings, oil system components, and other block-mounted items.

1

Main Bearing Bolts

M12 x 1.75
Important Notes
Tighten main bearing bolts in the specified sequence. Proper torque is vital for crankshaft alignment and preventing bearing failure.
2

Connecting Rod Nuts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure connecting rod caps are properly aligned. Correct torque is essential to prevent bearing failure and rod damage.
3

Oil Pan Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even sealing. Over-torquing can damage the pan or gasket.
4

Oil Pump Mounting Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
These bolts secure the oil pump to the engine block, which is critical for proper engine lubrication.
5

Oil Filter Housing Bolt

M8 x 1.25
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten these bolts to prevent oil leaks. Do not over tighten the filter housing to the engine block.
6

Crankshaft Position Sensor (CKP) Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
This bolt secures the CKP sensor to the engine block. Ensure the sensor is properly positioned before tightening.

Timing System

Bolts related to the timing system, including the timing chain cover, tensioner, camshaft sprockets, and related components.

1

Timing Chain Cover Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even sealing of the timing cover. Both upper and lower covers should be torqued to this specification. Avoid over-tightening.
2

Timing Chain Tensioner Bolts

M8 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the chain tensioner to the timing chain cover. Proper torque is important for correct chain tension.
3

Camshaft Sprocket Bolt

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Ensure proper alignment of sprockets and camshafts. Proper torque is essential for accurate valve timing.
4

Camshaft Position Sensor (CMP) Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
This bolt secures the CMP sensor to the timing chain cover. There are two bolts on the front of the timing cover that must be tightened to 12 N.m (9 ft-lbs)

Intake System

Bolts and fasteners related to the intake system, including the intake manifold, throttle body, EGR valve, and related components.

1

Intake Manifold Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten intake manifold bolts in a crisscross pattern to ensure even sealing. Proper torque prevents vacuum leaks.
2

Intake Manifold Plenum Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
These bolts secure the two pieces of the intake manifold together. Ensure even tightening of these bolts.
3

Throttle Body Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten these bolts evenly to ensure an airtight seal. Over-tightening can damage the throttle body or gasket.
4

EGR Valve Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
These bolts secure the EGR valve to the intake manifold. Tighten evenly to prevent leaks.
5

Coolant Temperature Sensor

M10 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
This sensor is threaded into the intake manifold. Tighten securely to measure coolant temperature. Do not over tighten.
6

Fuel Rail Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten these bolts evenly to ensure a proper seal. Proper torque prevents fuel leaks.
7

Fuel Injector Bolts

M6 x 1.0
Torque Value
21 ft-lbs (28 N·m)
Important Notes
Tighten fuel injector bolts evenly. Over-tightening can damage the injector or its seals.

Exhaust System

Bolts and fasteners related to the exhaust system, including exhaust manifolds/headers, and related components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Tighten these bolts in a crisscross pattern to prevent leaks. Improper torque can lead to exhaust leaks.

Cooling System

Bolts and fasteners related to the cooling system, including the water pump, thermostat housing, and related components.

1

Water Pump Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
These bolts secure the water pump to the engine block. Proper torque prevents coolant leaks.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
These bolts secure the water pump pulley to the water pump. Proper torque prevents slippage.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Proper torque is necessary to prevent coolant leaks. Over tightening can damage the housing.

Accessory Drive

Bolts and fasteners related to the accessory drive, including the crankshaft pulley, belt tensioner, idler pulley, and related components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
105 ft-lbs (142 N·m)
Important Notes
This bolt secures the crankshaft pulley/harmonic balancer to the crankshaft. Proper torque is critical for proper function.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten this bolt to ensure the proper belt tension. Improper torque can lead to belt slippage.
3

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Proper torque is important to prevent bearing failure and ensure smooth belt operation.

Electrical System

Bolts and fasteners related to the electrical system, including the starter, alternator, ignition coils, and related components.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten these bolts to ensure a secure electrical connection. Over tightening can damage the coil.
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the starter motor to the engine block. Ensure starter is properly positioned before tightening.
3

Alternator Mounting Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the alternator to the engine. Ensure proper alignment before tightening.

Other

Bolts and fasteners for components not classified into a major subsystem.

1

Knock Sensor Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
The 2.7L has 2 knock sensors located at the valley of the engine. Ensure they are securely tightened.
2

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
These bolts secure the A/C compressor to the engine. Ensure proper alignment before tightening.
3

Flywheel Bolts

M10 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
These bolts attach the flywheel to the crankshaft. Proper torque is critical for proper engagement with the transmission or torque converter and to prevent loosening.

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 are torque specifications important?

Correct torque ensures proper clamping force, preventing leaks, component failure, and damage. Over-tightening can strip threads or break bolts, while under-tightening can cause parts to loosen over time. For example, overtightening cylinder head bolts can lead to gasket failure and engine damage, while undertightening can cause compression leaks and engine misfires.

Q2

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

Without a torque wrench, it's extremely difficult to apply the correct amount of force. You risk overtightening or undertightening bolts, leading to damage or failure. For instance, if you tighten the intake manifold without a torque wrench, you might create air leaks which can cause lean running conditions and diagnostic codes.

Q3

Do I need to replace bolts when I remove them?

It's generally recommended to replace torque-to-yield bolts, such as cylinder head bolts, as they stretch during use and may not provide the correct clamping force if reused. Some other bolts, like the intake manifold bolts or timing cover bolts, can often be reused if they're in good condition. However, if a bolt shows signs of wear or damage, it is advisable to replace them.

Q4

What's the correct tightening sequence?

Following a specific tightening sequence, usually provided in a repair manual, is crucial, especially for components like cylinder heads or intake manifolds. This sequence ensures even pressure distribution and prevents warping. For the cylinder head, a specific sequence is required which usually starts from the center and progresses outwards in a spiral pattern. Skipping this can lead to uneven clamping force and gasket leaks.

Q5

Can I use threadlocker on these bolts?

While threadlocker (such as Loctite) is sometimes necessary, it's not universally required. Check the manufacturer's service manual for recommendations on specific bolts. For example, bolts securing the harmonic balancer often require threadlocker. For the majority of bolts, you may not need it as long as the fasteners are torqued correctly. It should also be avoided on some components where it might make future removal difficult.

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 torque wrench is essential for achieving accurate bolt tightening and preventing damage to engine components.

  • Accurate torque measurement
  • Variety of torque ranges
Learn more

Socket Set

A comprehensive socket set, including metric sizes, is necessary for removing and installing various engine bolts.

  • Metric socket sizes
  • Various drive sizes (1/4", 3/8", 1/2")
Learn more

Wobble Extensions

Wobble extensions and universal joints are helpful in reaching bolts in tight or awkward spaces.

  • Allows access to difficult angles
  • Variety of lengths and sizes
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

This procedure outlines the correct sequence and torque specifications for tightening cylinder head bolts on a 2.7L engine.

  • Clean all bolt threads thoroughly.
  • Apply engine oil to the threads of the bolts.
  • Follow the correct tightening sequence (typically an initial pass, then a final pass with angle tightening).
  • Torque to the first stage (typically 25-35 ft-lbs).
  • Rotate all head bolts an additional 90 degrees in correct sequence.
  • Rotate all head bolts another 90 degrees in correct sequence.
View full procedure

Intake Manifold Bolt Tightening Procedure

Details the correct torque specifications and sequence for securing the intake manifold to the engine.

  • Hand tighten all bolts evenly.
  • Torque all intake manifold bolts to 106 in-lbs following the sequence.
  • Recheck torque of each bolt.
View full procedure

Exhaust Manifold Bolt Tightening Procedure

Details the torque specification and tightening sequence for securing the exhaust manifold to the engine.

  • Hand tighten all bolts evenly.
  • Torque all exhaust manifold bolts to 25 ft-lbs following the sequence.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-torque Recommendation

2007-05-15

This bulletin addresses reports of head gasket leaks and recommends re-torquing cylinder head bolts after a specific mileage or time interval.

2005-2007 Chrysler 300 with 2.7L Engine

Resolution: Re-torque cylinder head bolts to manufacturer's specifications after 10,000 miles or 6 months, whichever comes first.

Intake Manifold Gasket Leak Advisory

2008-11-20

Advisory regarding potential leaks at the intake manifold gasket due to improper installation or torque.

2005-2010 Chrysler 300 with 2.7L Engine

Resolution: Check the intake manifold bolts for proper torque and replace gasket if leaks are present.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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