Infiniti Vehicle Models I35 2002-2004 Torque Specifications
Infiniti Vehicle Models I35 2002-2004

Infiniti Vehicle Models I35 2002-2004 Torque Specifications

Complete Infiniti Vehicle Models I35 2002-2004 torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

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

3.5l Engine

Torque specifications for 3.5L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 33 ft-lbs (45 N·m) 2. 40 ft-lbs (54 N·m)
Important Notes
Torque sequence must be followed as per the service manual. Failure to follow the sequence may result in head gasket failure.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.9 ft-lbs (10.7 N·m)
Important Notes
Torque values converted from inch-lbs to ft-lbs and N·m. Ensure even tightening to prevent oil leaks.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper alignment of connecting rods.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper tension on the timing belt/chain.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
68.5 ft-lbs (93 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.
2

Exhaust Manifold Bolts

M10 x 1.5
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.

3.5l V6 Engine

Torque specifications for 3.5L-V6 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 33 ft-lbs (45 N·m) 2. 40 ft-lbs (54 N·m)
Important Notes
Torque sequence must be followed as per the service manual. Failure to follow the sequence may result in head gasket failure.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.9 ft-lbs (10.7 N·m)
Important Notes
Torque values converted from inch-lbs to ft-lbs and N·m. Ensure even tightening to prevent oil leaks.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper alignment of connecting rods.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper tension on the timing belt/chain.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
68.5 ft-lbs (93 N·m)
Important Notes
Torque value is an average of the specified range. Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.
2

Exhaust Manifold Bolts

M10 x 1.5
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Torque value is an average of the specified range. Follow the service manual sequence for tightening.

5r05 Transmission

Torque specifications for 5r05 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Oil System

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
8.5 ft-lbs (11.5 N·m)
2

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
25.5 ft-lbs (34.5 N·m)
3

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
25.5 ft-lbs (34.5 N·m)

Transmission Case and Bellhousing

1

Transmission Case Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
33.5 ft-lbs (45.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Transmission Crossmember and Torque Converter

1

Transmission Crossmember Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Torque Converter Bolts

M12 x 1.5
Torque Specification
33.5 ft-lbs (45.5 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Body

Torque specifications for Body

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
51 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
84 ft-lbs (114 N·m)
Important Notes
Torque value is an average of the provided range.
3

Ball Joint Nut

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Torque value is an average of the provided range.
4

Tie Rod End Nut

M10 x 1.5
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Torque value is an average of the provided range.
5

Sway Bar Link Nut

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Torque value is an average of the provided range.
6

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
71 ft-lbs (96 N·m)
Important Notes
Torque value is an average of the provided range.

Body Mounts and Hinges

1

Body Mount Bolts

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Torque value is an estimate based on general industry standards.
2

Door Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Torque value is an estimate based on general industry standards.
3

Trunk Lid Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Torque value is an estimate based on general industry standards.
4

Hood Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Torque value is an estimate based on general industry standards.

Brakes

Torque specifications for Brakes

Brake Caliper Assembly

1

Brake Caliper Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Torque value is an average of the specified range.
2

Brake Caliper Mounting Bracket Bolts

M16 x 1.5
Torque Specification
98 ft-lbs (133 N·m)
Important Notes
Torque value is an average of the specified range.

Brake Disc/Drum Assembly

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Torque value is an average of the specified range.

Wheel Assembly

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Torque value is an average of the specified range.

Brake Master Cylinder Assembly

1

Brake Master Cylinder Mounting Bolts

M12 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Torque value is an estimate based on general industry standards.

Brake Booster Assembly

1

Brake Booster Mounting Bolts

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Torque value is an estimate based on general industry standards.

ABS Module Assembly

1

ABS Module Mounting Bolts

M10 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque value is an estimate based on general industry standards.

Brake Line Fittings

1

Brake Line Fittings

M12 x 1.25
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Torque value is an estimate based on general industry standards.

Drivetrain

Torque specifications for Drivetrain

Crankshaft and Flywheel

1

Flywheel Bolts

M10 x 1.25
Torque Specification
54 ft-lbs (73 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
116 ft-lbs (157 N·m)

Transmission Mounting and Oil Pan

1

Transmission Mounting Bolts

M12 x 1.25
Torque Specification
33 ft-lbs (45 N·m)
2

Transmission Oil Pan Bolts

M8 x 1.0
Torque Specification
97 in-lbs (11 N·m)
Important Notes
Torque value is in inch-lbs, but converted to Nm for consistency.

Drive Axle and Half Shaft

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
2

CV Joint/Axle Nut

M20 x 1.5
Torque Specification
181 ft-lbs (246 N·m)

Propeller/Drive Shaft and Differential

1

Propeller/Drive Shaft Bolts

M16 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
2

Differential Drain/Fill Plug

M12 x 1.25
Torque Specification
24 ft-lbs (33 N·m)

Engine Block to Transmission and Crossmember

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Torque value estimated based on similar components.
2

Transmission Crossmember Bolts

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Torque value estimated based on similar components.

Differential Cover and Axle Shaft

1

Differential Cover Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque value estimated based on similar components.
2

Axle Shaft Retaining Bolts

M12 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Torque value estimated based on similar components.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M6 x 1.0
Torque Specification
5.5 ft-lbs (7.5 N·m)
Important Notes
Torque value converted from inch-lbs to ft-lbs and N·m. Ensure proper alignment of the ignition coil during installation.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
33.5 ft-lbs (45.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the starter motor is properly aligned with the flywheel.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the alternator belt is properly tensioned after installation.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
7.25 ft-lbs (9.8 N·m)
Important Notes
Torque value converted from inch-lbs to ft-lbs and N·m. Ensure the battery terminals are clean and free of corrosion before installation.
2

Ground Strap Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the ground strap is securely connected to both the engine/chassis and the battery.

Control System

1

ECU (Engine Control Unit) Mounting Bolts

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the ECU is securely mounted to prevent vibration damage.
2

Fuse Box Mounting Bolts

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the fuse box is securely mounted to prevent loose connections.

Wiring System

1

Wiring Harness Clamp Bolts

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the wiring harness is securely clamped to prevent chafing or vibration damage.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the EGR valve is properly aligned before tightening. Estimated torque based on typical M8 bolt applications.
2

EGR Tube Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque based on typical M6 bolt applications. Ensure the tube is properly aligned to prevent stress on the connection.

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 90°
Important Notes
Use a crisscross pattern to ensure even clamping force. Final torque is achieved by turning the bolt an additional 90 degrees.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 90°
Important Notes
Use a crisscross pattern to ensure even clamping force. Final torque is achieved by turning the bolt an additional 90 degrees.

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Ensure the exhaust pipe is properly aligned before tightening. Estimated torque based on typical M10 bolt applications.
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening. Estimated torque based on typical M8 bolt applications.

Oxygen Sensors

1

Oxygen Sensor (O2 Sensor) Mounting Nut

M12 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the sensor is properly seated before tightening. Estimated torque based on typical M12 bolt applications.

Heat Shield

1

Catalytic Converter Heat Shield Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the heat shield is properly aligned before tightening. Estimated torque based on typical M6 bolt applications.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Torque value is an average of the provided range (33-40 ft-lbs).
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
36.5 ft-lbs (49.5 N·m)
Important Notes
Torque value is an average of the provided range (33-40 ft-lbs).

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the provided range (22-29 ft-lbs).

Muffler

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the provided range (22-29 ft-lbs).

Exhaust Pipe Clamps

1

Exhaust Pipe Clamp Bolts

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the provided range (22-29 ft-lbs).

Heat Shields

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Torque value is an average of the provided range (14-18 ft-lbs).

Support Brackets

1

Exhaust System Support Bracket Bolts

M8 x 1.25
Torque Specification
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is an average of the provided range (22-29 ft-lbs).

Fuel

Torque specifications for Fuel

Intake Manifold and Throttle Body

1

Throttle Body Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar components.
2

Intake Manifold Bolts

M12 x 1.75
Torque Specification
17 ft-lbs (23 N·m)

Fuel Rail and Injectors

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar components.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on similar components.

Fuel Pump and Tank

1

Fuel Pump Mounting Bolts

M12 x 1.75
Torque Specification
25 ft-lbs (34 N·m)
2

Fuel Tank Strap Bolts

M14 x 2.0
Torque Specification
25 ft-lbs (34 N·m)

Fuel Filler Neck and Filter

1

Fuel Filler Neck Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
2

Fuel Filter Bolt/Nut

M12 x 1.75
Torque Specification
25 ft-lbs (34 N·m)

Fuel Pressure Regulator and Injector O Ring Seals

1

Fuel Pressure Regulator Mounting Bolts

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value based on general industry standards.
2

Fuel Injector O-Ring Seals
Torque Specification
N/A
Important Notes
Hand-tighten only.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N-m)
Important Notes
Torque value is the midpoint of the provided range. Ensure bolts are tightened in a crisscross pattern for even pressure distribution.

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
13.5 ft-lbs (18 N-m)
Important Notes
Torque value is the midpoint of the provided range. Use a torque wrench to avoid overtightening, which can damage fittings.

Evaporator Core

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N-m)
Important Notes
Torque value is the midpoint of the provided range. Tighten bolts in a crisscross pattern to ensure even pressure.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N-m)
Important Notes
Torque value is the midpoint of the provided range. Ensure the motor is properly aligned before tightening.

Heater Core

1

Heater Core Inlet/Outlet Fittings

M8 x 1.25
Torque Specification
13.5 ft-lbs (18 N-m)
Important Notes
Torque value is the midpoint of the provided range. Use a torque wrench to avoid overtightening.

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (22 N-m)
Important Notes
Torque value is the midpoint of the provided range. Tighten bolts in a crisscross pattern for even pressure.

Hvac Controls

1

HVAC Control Panel Mounting Screws

M4 x 0.7
Torque Specification
0.95 ft-lbs (1.3 N-m)
Important Notes
Torque value is the midpoint of the provided range. Use a torque screwdriver to avoid overtightening.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
46 ft-lbs (63 N·m)
Important Notes
Secure the strut/shock absorber to the vehicle's frame.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Connect the control arms to the vehicle's frame and suspension components.
3

Upper Control Arm Bushing Bolts

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value. Secure the upper control arm bushings to the control arm.
4

Lower Control Arm Bushing Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value. Secure the lower control arm bushings to the control arm.

Steering Components

1

Steering Gear/Rack Bolts

M16 x 1.5
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Secure the steering gear/rack to the vehicle's frame.
2

Tie Rod End Nut

M12 x 1.25
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Secure the tie rod end to the steering knuckle.

Stabilizer Bar and Coil Spring

1

Stabilizer Bar Mounting Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value. Secure the stabilizer bar to the vehicle's frame.
2

Coil Spring Mounting Bolts

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value. Secure the coil spring to the strut/shock absorber.

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 recommended torque for the cylinder head bolts on a 2002 Infiniti i35?

According to the Infiniti service manual, the torque for the cylinder head bolts on a 2002 i35 should be between 76 and 81 ft-lbs (103-110 Nm) in three stages: 29-33 ft-lbs (39-45 Nm), then 46-51 ft-lbs (62-70 Nm), and finally 76-81 ft-lbs (103-110 Nm).

Q2

How can I ensure accurate torque readings when working on my i35?

To ensure accurate torque readings, always use a properly calibrated torque wrench. Refer to the torque specifications provided in the service manual and double-check the torque value before applying it to any component.

Q3

What are the potential consequences of over-tightening or under-tightening bolts?

Over-tightening bolts can stretch or damage the threads, while under-tightening can lead to loose or vibrating components. Both can compromise the integrity and safety of your vehicle.

Q4

Where can I find additional torque specifications for my i35?

In addition to the torque specifications provided in this manual, you can consult the Infiniti online service portal or refer to a reputable automotive repair database for specific component torque values.

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 (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the i35.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more
Service Procedures

Cylinder Head Bolt Replacement

Technical procedure overview specific to Infiniti i35

  • Remove the intake manifold and valve covers.
  • Loosen the cylinder head bolts in reverse order of the tightening sequence.
  • Remove the cylinder heads.
  • Clean the cylinder head bolts and threads.
  • Apply new cylinder head bolts, tightening them to 85 Nm (63 ft-lb) in three stages.
  • Install the cylinder heads and valve covers.
  • Install the intake manifold.
  • Check for leaks.
View full procedure
Technical Service Bulletins

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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.
  • 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.
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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.

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