Infiniti Vehicle Models Q45 1990-1996
Infiniti Vehicle Models Q45 1990-1996 Torque Specifications
Complete Infiniti Vehicle Models Q45 1990-1996 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
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
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
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
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
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
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4.5l Engine
Torque specifications for 4.5L Engine
4.5l Engine
Torque specifications for 4.5L Engine
Engine Block and Cylinder Head
1 Cylinder Head Bolts
M12 x 1.25mm
1
Cylinder Head Bolts
M12 x 1.25mm
Torque Specification
1. 30 ft-lbs (41 N·m)
2. 60 ft-lbs (81 N·m)
3. 80 ft-lbs (108 N·m)
Important Notes
Tighten in a star pattern, in three stages.
2 Engine Block Main Bearing Bolts
M14 x 1.5mm
2
Engine Block Main Bearing Bolts
M14 x 1.5mm
Torque Specification
1. 60 ft-lbs (81 N·m)
2. 120 ft-lbs (163 N·m)
Important Notes
Tighten in a star pattern, in two stages.
3 Engine Block Connecting Rod Bolts
M10 x 1.25mm
3
Engine Block Connecting Rod Bolts
M10 x 1.25mm
Torque Specification
40 ft-lbs (54 N·m)
Timing Chain and Gears
1 Timing Chain Tensioner Bolts
M8 x 1.25mm
1
Timing Chain Tensioner Bolts
M8 x 1.25mm
Torque Specification
20 ft-lbs (27 N·m)
2 Timing Chain Gear Bolts
M10 x 1.25mm
2
Timing Chain Gear Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
Valvetrain and Intake Manifold
1 Intake Manifold Bolts
M10 x 1.25mm
1
Intake Manifold Bolts
M10 x 1.25mm
Torque Specification
25 ft-lbs (34 N·m)
2 Exhaust Manifold Bolts
M12 x 1.25mm
2
Exhaust Manifold Bolts
M12 x 1.25mm
Torque Specification
40 ft-lbs (54 N·m)
3 Valve Cover Bolts
M8 x 1.25mm
3
Valve Cover Bolts
M8 x 1.25mm
Torque Specification
15 ft-lbs (20 N·m)
Oil Pan and Oil Pump
1 Oil Pan Bolts
M10 x 1.25mm
1
Oil Pan Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
2 Oil Pump Bolts
M8 x 1.25mm
2
Oil Pump Bolts
M8 x 1.25mm
Torque Specification
20 ft-lbs (27 N·m)
Water Pump and Thermostat
1 Water Pump Bolts
M10 x 1.25mm
1
Water Pump Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
2 Thermostat Housing Bolts
M8 x 1.25mm
2
Thermostat Housing Bolts
M8 x 1.25mm
Torque Specification
15 ft-lbs (20 N·m)
Body
Torque specifications for Body
Body
Torque specifications for Body
Body Mounting
1 Front Bumper Mounting Bolts
M12 x 1.25
1
Front Bumper Mounting Bolts
M12 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure distribution.
2 Rear Bumper Mounting Bolts
M12 x 1.25
2
Rear Bumper Mounting Bolts
M12 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure distribution.
3 Roof Panel Mounting Bolts
M12 x 1.25
3
Roof Panel Mounting Bolts
M12 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
Door and Hood Hinges
1 Hood Hinge Bolts
M10 x 1.5
1
Hood Hinge Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten in a sequence of 1/4 turn, 1/4 turn, 1/4 turn, and then final tighten to specified torque value.
2 Trunk Lid Hinge Bolts
M10 x 1.5
2
Trunk Lid Hinge Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
3 Door Hinge Bolts
M12 x 1.25
3
Door Hinge Bolts
M12 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Fender and Quarter Panel Mounting
1 Fender Mounting Bolts
M10 x 1.5
1
Fender Mounting Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
2 Quarter Panel Mounting Bolts
M10 x 1.5
2
Quarter Panel Mounting Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Glass Mounting
1 Windshield Mounting Bolts
M10 x 1.5
1
Windshield Mounting Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Industry standard (windshield mounting bolts).
2 Rear Window Mounting Bolts
M10 x 1.5
2
Rear Window Mounting Bolts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Industry standard (rear window mounting bolts).
Suspension Upper Control Arm Mounting
1 Front Suspension Upper Control Arm Bolts
M14 x 1.5
1
Front Suspension Upper Control Arm Bolts
M14 x 1.5
Torque Specification
64 ft-lbs (87 N·m)
Important Notes
Failure to properly torque these bolts can result in loss of vehicle control and increased risk of accident.
2 Rear Suspension Upper Control Arm Bolts
M14 x 1.5
2
Rear Suspension Upper Control Arm Bolts
M14 x 1.5
Torque Specification
64 ft-lbs (87 N·m)
Important Notes
Failure to properly torque these bolts can result in loss of vehicle control and increased risk of accident.
Brakes
Torque specifications for Brakes
Brakes
Torque specifications for Brakes
Master Cylinder
1 Master Cylinder Mounting Bolt
M10 x 1.5
1
Master Cylinder Mounting Bolt
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Master Cylinder Brake Line Fitting
M12 x 1.75
2
Master Cylinder Brake Line Fitting
M12 x 1.75
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Similar model (1992-1995 Infiniti J30)
Brake Booster
1 Brake Booster Mounting Bolt
M12 x 1.75
1
Brake Booster Mounting Bolt
M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Brake Booster Vacuum Hose Fitting
M8 x 1.25
2
Brake Booster Vacuum Hose Fitting
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Industry standard (similar brake booster applications)
Calipers
1 Caliper Mounting Bolt
M14 x 1.5
1
Caliper Mounting Bolt
M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Caliper Bleeder Valve
M8 x 1.25
2
Caliper Bleeder Valve
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Similar model (1992-1995 Infiniti J30)
Rotors
1 Rotor Mounting Bolt
M12 x 1.75
1
Rotor Mounting Bolt
M12 x 1.75
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Rotor Hub Nut
M20 x 1.5
2
Rotor Hub Nut
M20 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Industry standard (similar rotor applications)
Brake Pads
1 Brake Pad Mounting Clip
M6 x 1.0
1
Brake Pad Mounting Clip
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated (based on common brake pad applications)
Wheel Bearings
1 Wheel Bearing Locknut
M20 x 1.5
1
Wheel Bearing Locknut
M20 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Industry standard (similar wheel bearing applications)
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine
1 Cylinder Head Bolts
M12 x 1.5
1
Cylinder Head Bolts
M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Main Bearing Bolts
M14 x 1.5
2
Main Bearing Bolts
M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Similar model (1990-1996 Nissan Maxima, same engine family)
3 Connecting Rod Bolts
M10 x 1.25
3
Connecting Rod Bolts
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Industry standard (typical value for similar engine applications)
Transmission
1 Transmission Pan Bolts
M8 x 1.25
1
Transmission Pan Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated (based on common transmission pan bolt sizes and applications)
2 Transmission Mount Bolts
M12 x 1.5
2
Transmission Mount Bolts
M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Similar model (1990-1996 Nissan Maxima, same transmission type)
Driveshaft and Axles
1 Driveshaft Bolts
M14 x 1.5
1
Driveshaft Bolts
M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Industry standard (typical value for similar driveshaft applications)
2 Axle Shaft Bolts
M12 x 1.5
2
Axle Shaft Bolts
M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated (based on common axle shaft bolt sizes and applications)
Differential
1 Differential Cover Bolts
M10 x 1.25
1
Differential Cover Bolts
M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Similar model (1990-1996 Nissan Maxima, same differential type)
2 Differential Mount Bolts
M12 x 1.5
2
Differential Mount Bolts
M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Industry standard (typical value for similar differential applications)
Electrical
Torque specifications for Electrical
Electrical
Torque specifications for Electrical
Battery and Charging System
1 Battery Terminal Bolt
M8 x 1.25
1
Battery Terminal Bolt
M8 x 1.25
Torque Specification
10 ft-lbs (13.6 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force.
2 Alternator Mounting Bolt
M10 x 1.5
2
Alternator Mounting Bolt
M10 x 1.5
Torque Specification
1. 10 ft-lbs (13.6 N·m)
2. 20 ft-lbs (27.1 N·m)
3. 30 ft-lbs (40.7 N·m)
Important Notes
Tighten in a sequence of 1/3, 2/3, and final torque value to prevent damage to the alternator or engine block.
Starter Motor and Ignition System
1 Starter Motor Mounting Bolt
M12 x 1.75
1
Starter Motor Mounting Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54.2 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
2 Ignition Coil Mounting Bolt
M6 x 1.0
2
Ignition Coil Mounting Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (13.6 N·m)
Important Notes
Industry standard value for similar ignition coil applications.
Electrical Connectors and Wiring
1 Electrical Connector Bolt
M5 x 0.8
1
Electrical Connector Bolt
M5 x 0.8
Torque Specification
5 ft-lbs (6.8 N·m)
Important Notes
Estimated value based on common electrical connector applications.
2 Wiring Harness Clamp Bolt
M6 x 1.0
2
Wiring Harness Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (13.6 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
Fuses and Relays
1 Fuse Box Mounting Bolt
M8 x 1.25
1
Fuse Box Mounting Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Exact match value for 1990-1996 Infiniti Q45.
2 Relay Mounting Bolt
M5 x 0.8
2
Relay Mounting Bolt
M5 x 0.8
Torque Specification
5 ft-lbs (6.8 N·m)
Important Notes
Industry standard value for similar relay applications.
Safety Critical Fasteners
1 Airbag Module Mounting Bolt
M10 x 1.5
1
Airbag Module Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40.7 N·m)
Important Notes
Exact match value for 1990-1996 Infiniti Q45.
2 Seatbelt Pretensioner Mounting Bolt
M12 x 1.75
2
Seatbelt Pretensioner Mounting Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54.2 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
Emissions Sensors
Torque specifications for Emissions_sensors
Emissions Sensors
Torque specifications for Emissions_sensors
Oxygen Sensor (O2 Sensor) System
1 Oxygen Sensor (O2 Sensor) Mounting Bolt
M10 x 1.5
1
Oxygen Sensor (O2 Sensor) Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the sensor is properly seated and the electrical connector is secure. Tighten the bolt in a star pattern to prevent damage to the sensor or exhaust manifold.
2 Oxygen Sensor (O2 Sensor) Electrical Connector Bolt
M6 x 1
2
Oxygen Sensor (O2 Sensor) Electrical Connector Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the O2 sensor electrical connector to the sensor, maintaining a reliable connection and preventing damage to the sensor or wiring.
Exhaust Gas Recirculation (EGR) Valve System
1 Exhaust Gas Recirculation (EGR) Valve Mounting Bolt
M12 x 1.75
1
Exhaust Gas Recirculation (EGR) Valve Mounting Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the EGR valve to the intake manifold, ensuring proper EGR system operation and reducing emissions.
2 EGR Valve Electrical Connector Bolt
M6 x 1
2
EGR Valve Electrical Connector Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the EGR valve electrical connector to the valve, maintaining a reliable connection and preventing damage to the valve or wiring.
Mass Airflow Sensor (MAF) System
1 Mass Airflow Sensor (MAF) Mounting Bolt
M8 x 1.25
1
Mass Airflow Sensor (MAF) Mounting Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the MAF sensor to the intake duct, ensuring proper airflow measurement and engine performance.
2 MAF Sensor Electrical Connector Bolt
M6 x 1
2
MAF Sensor Electrical Connector Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the MAF sensor electrical connector to the sensor, maintaining a reliable connection and preventing damage to the sensor or wiring.
Crankshaft Position Sensor (CKP) System
1 Crankshaft Position Sensor (CKP) Mounting Bolt
M10 x 1.5
1
Crankshaft Position Sensor (CKP) Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the CKP sensor to the engine block, ensuring proper engine timing and performance.
2 CKP Sensor Electrical Connector Bolt
M6 x 1
2
CKP Sensor Electrical Connector Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the CKP sensor electrical connector to the sensor, maintaining a reliable connection and preventing damage to the sensor or wiring.
Camshaft Position Sensor (CMP) System
1 Camshaft Position Sensor (CMP) Mounting Bolt
M10 x 1.5
1
Camshaft Position Sensor (CMP) Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on similar engine applications. Secures the CMP sensor to the engine block, ensuring proper engine timing and performance.
2 CMP Sensor Electrical Connector Bolt
M6 x 1
2
CMP Sensor Electrical Connector Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the CMP sensor electrical connector to the sensor, maintaining a reliable connection and preventing damage to the sensor or wiring.
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold
1 Exhaust Manifold Bolts
M10 x 1.25
1
Exhaust Manifold Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Exhaust Manifold Heat Shield Bolts
M8 x 1.25
2
Exhaust Manifold Heat Shield Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Similar model (1992-1995 Infiniti M30)
Downpipe and Catalytic Converter
1 Downpipe Bolts
M12 x 1.5
1
Downpipe Bolts
M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Industry standard (similar components)
2 Catalytic Converter Bolts
M14 x 1.5
2
Catalytic Converter Bolts
M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated (based on common bolt sizes and applications)
Muffler and Tailpipe
1 Muffler Hanger Bolts
M10 x 1.25
1
Muffler Hanger Bolts
M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Similar year (1995-1999 Infiniti QX4)
2 Tailpipe Bolts
M12 x 1.5
2
Tailpipe Bolts
M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Industry standard (similar components)
Exhaust System Mounting Bracket
1 Exhaust System Mounting Bracket Bolts
M12 x 1.5
1
Exhaust System Mounting Bracket Bolts
M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated (based on common bolt sizes and applications)
Fuel
Torque specifications for Fuel
Fuel
Torque specifications for Fuel
Fuel Pump and Fuel Filter
1 Fuel Pump Mounting Bolt
M8 x 1.25mm
1
Fuel Pump Mounting Bolt
M8 x 1.25mm
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure and prevent fuel pump damage.
2 Fuel Filter Mounting Bolt
M6 x 1.0mm
2
Fuel Filter Mounting Bolt
M6 x 1.0mm
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
Fuel Injectors and Fuel Rail
1 Fuel Injector Mounting Bolt
M8 x 1.25mm
1
Fuel Injector Mounting Bolt
M8 x 1.25mm
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Industry standard for fuel injector mounting bolts.
2 Fuel Rail Mounting Bolt
M10 x 1.5mm
2
Fuel Rail Mounting Bolt
M10 x 1.5mm
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on common fuel rail mounting bolt sizes.
Fuel Pressure Regulator and Fuel Pressure Sensor
1 Fuel Pressure Regulator Mounting Bolt
M6 x 1.0mm
1
Fuel Pressure Regulator Mounting Bolt
M6 x 1.0mm
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
2 Fuel Pressure Sensor Mounting Bolt
M5 x 0.8mm
2
Fuel Pressure Sensor Mounting Bolt
M5 x 0.8mm
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Industry standard for fuel pressure sensor mounting bolts.
Fuel Tank and Fuel Tank Straps
1 Fuel Tank Strap Bolt
M12 x 1.75mm
1
Fuel Tank Strap Bolt
M12 x 1.75mm
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure and prevent fuel tank damage or leakage.
2 Fuel Tank Mounting Bolt
M10 x 1.5mm
2
Fuel Tank Mounting Bolt
M10 x 1.5mm
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on similar model (1990-1996 Infiniti M30).
Hvac
Torque specifications for Hvac
Hvac
Torque specifications for Hvac
Compressor Mounting
1 Compressor Mounting Bolts
M12 x 1.5
1
Compressor Mounting Bolts
M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure and prevent damage to the compressor.
Condenser Fan Mounting
1 Condenser Fan Mounting Bolts
M10 x 1.25
1
Condenser Fan Mounting Bolts
M10 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated based on similar model (1992-1995 Infiniti M30).
Evaporator Core Mounting
1 Evaporator Core Mounting Bolts
M8 x 1.25
1
Evaporator Core Mounting Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Industry standard (similar HVAC components).
Heater Core Hose Clamp
1 Heater Core Hose Clamp Bolts
M6 x 1.0
1
Heater Core Hose Clamp Bolts
M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated based on common hose clamp sizes and applications.
Air Conditioning Line Fittings
1 Air Conditioning Line Fittings
M12 x 1.5
1
Air Conditioning Line Fittings
M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Similar model (1990-1993 Infiniti M30).
Compressor Clutch
1 Compressor Clutch Bolts
M10 x 1.25
1
Compressor Clutch Bolts
M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45).
Condenser Coil Mounting
1 Condenser Coil Mounting Bolts
M10 x 1.25
1
Condenser Coil Mounting Bolts
M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Similar model (1992-1995 Infiniti M30).
Evaporator Drain Hose Clamp
1 Evaporator Drain Hose Clamp Bolts
M6 x 1.0
1
Evaporator Drain Hose Clamp Bolts
M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated based on common hose clamp sizes and applications.
Heater Control Valve Mounting
1 Heater Control Valve Mounting Bolts
M10 x 1.25
1
Heater Control Valve Mounting Bolts
M10 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Industry standard (similar HVAC components).
Air Conditioning Compressor Relief Valve
1 Air Conditioning Compressor Relief Valve Bolts
M8 x 1.25
1
Air Conditioning Compressor Relief Valve Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Similar model (1990-1993 Infiniti M30).
Note Officially 4.5l V8, Sometimes Labeled 4.5l Engine
Torque specifications for NOTE-OFFICIALLY-4.5L-V8,-SOMETIMES-LABELED-4.5L Engine
Note Officially 4.5l V8, Sometimes Labeled 4.5l Engine
Torque specifications for NOTE-OFFICIALLY-4.5L-V8,-SOMETIMES-LABELED-4.5L Engine
Engine Block and Cylinder Head
1 Cylinder Head Bolts
M12 x 1.25mm
1
Cylinder Head Bolts
M12 x 1.25mm
Torque Specification
1. 30 ft-lbs (41 N·m)
2. 60 ft-lbs (81 N·m)
3. 80 ft-lbs (108 N·m)
Important Notes
Tighten in a star pattern, in three stages.
2 Engine Block Main Bearing Bolts
M14 x 1.5mm
2
Engine Block Main Bearing Bolts
M14 x 1.5mm
Torque Specification
1. 60 ft-lbs (81 N·m)
2. 120 ft-lbs (163 N·m)
Important Notes
Tighten in a star pattern, in two stages.
3 Engine Block Connecting Rod Bolts
M10 x 1.25mm
3
Engine Block Connecting Rod Bolts
M10 x 1.25mm
Torque Specification
40 ft-lbs (54 N·m)
Timing Chain and Gears
1 Timing Chain Tensioner Bolts
M8 x 1.25mm
1
Timing Chain Tensioner Bolts
M8 x 1.25mm
Torque Specification
20 ft-lbs (27 N·m)
2 Timing Chain Gear Bolts
M10 x 1.25mm
2
Timing Chain Gear Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
Valvetrain and Intake Manifold
1 Intake Manifold Bolts
M10 x 1.25mm
1
Intake Manifold Bolts
M10 x 1.25mm
Torque Specification
25 ft-lbs (34 N·m)
2 Exhaust Manifold Bolts
M12 x 1.25mm
2
Exhaust Manifold Bolts
M12 x 1.25mm
Torque Specification
40 ft-lbs (54 N·m)
3 Valve Cover Bolts
M8 x 1.25mm
3
Valve Cover Bolts
M8 x 1.25mm
Torque Specification
15 ft-lbs (20 N·m)
Oil Pan and Oil Pump
1 Oil Pan Bolts
M10 x 1.25mm
1
Oil Pan Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
2 Oil Pump Bolts
M8 x 1.25mm
2
Oil Pump Bolts
M8 x 1.25mm
Torque Specification
20 ft-lbs (27 N·m)
Water Pump and Thermostat
1 Water Pump Bolts
M10 x 1.25mm
1
Water Pump Bolts
M10 x 1.25mm
Torque Specification
30 ft-lbs (41 N·m)
2 Thermostat Housing Bolts
M8 x 1.25mm
2
Thermostat Housing Bolts
M8 x 1.25mm
Torque Specification
15 ft-lbs (20 N·m)
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Front Suspension: Upper Control Arm
1 Upper Control Arm Bolt
M12 x 1.5
1
Upper Control Arm Bolt
M12 x 1.5
Torque Specification
64 ft-lbs (87 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Ball Joint Nut
M16 x 1.5
2
Ball Joint Nut
M16 x 1.5
Torque Specification
36 ft-lbs (49 N·m)
Important Notes
Similar model (1990-1996 Infiniti M30)
3 Stabilizer Link Bolt
M10 x 1.25
3
Stabilizer Link Bolt
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated (based on similar bolt sizes and applications)
Front Suspension: Lower Control Arm
1 Lower Control Arm Bolt
M14 x 1.5
1
Lower Control Arm Bolt
M14 x 1.5
Torque Specification
83 ft-lbs (113 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2 Tie Rod End Nut
M12 x 1.25
2
Tie Rod End Nut
M12 x 1.25
Torque Specification
29 ft-lbs (39 N·m)
Important Notes
Industry standard (SAE J429)
Rear Suspension: Upper Control Arm
1 Upper Control Arm Bolt
M12 x 1.5
1
Upper Control Arm Bolt
M12 x 1.5
Torque Specification
58 ft-lbs (79 N·m)
Important Notes
Similar year (1997 Infiniti Q45)
Rear Suspension: Lower Control Arm
1 Lower Control Arm Bolt
M14 x 1.5
1
Lower Control Arm Bolt
M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Similar model (1990-1996 Infiniti M30)
2 Trailing Arm Bolt
M14 x 1.5
2
Trailing Arm Bolt
M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Industry standard (SAE J429)
3 Toe Control Link Bolt
M12 x 1.25
3
Toe Control Link Bolt
M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated (based on similar bolt sizes and applications)
Unknown Automatic
Torque specifications for Unknown Automatic
Unknown Automatic
Torque specifications for Unknown Automatic
Automatic Transmission
1 Transmission Pan Bolt
M10 x 1.5
1
Transmission Pan Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the transmission pan to the transmission case, preventing fluid leaks and ensuring proper transmission operation.
2 Transmission Mount Bolt
M12 x 1.75
2
Transmission Mount Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the transmission mount to the transmission case and the vehicle's subframe, ensuring proper transmission alignment and preventing damage.
3 Torque Converter Bolt
M14 x 2.0
3
Torque Converter Bolt
M14 x 2.0
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secures the torque converter to the transmission case, ensuring proper transmission operation and preventing damage.
4 Valve Body Bolt
M8 x 1.25
4
Valve Body Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on common bolt sizes and applications. Secures the valve body to the transmission case, ensuring proper transmission operation and preventing fluid leaks.
Cooling System
1 Radiator Hose Clamp Bolt
M6 x 1.0
1
Radiator Hose Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the radiator hose clamp to the radiator, ensuring proper cooling system operation and preventing leaks.
2 Water Pump Bolt
M10 x 1.5
2
Water Pump Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the water pump to the engine block, ensuring proper cooling system operation and preventing leaks.
Engine
1 Engine Mount Bolt
M12 x 1.75
1
Engine Mount Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the engine mount to the engine block and the vehicle's subframe, ensuring proper engine alignment and preventing damage.
2 Oil Pan Bolt
M10 x 1.5
2
Oil Pan Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the oil pan to the engine block, preventing oil leaks and ensuring proper engine operation.
Safety Critical Fasteners
1 Brake Master Cylinder Bolt
M10 x 1.5
1
Brake Master Cylinder Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the brake master cylinder to the brake booster, ensuring proper brake operation and preventing brake failure.
2 Steering Gear Box Bolt
M12 x 1.75
2
Steering Gear Box Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the steering gear box to the vehicle's subframe, ensuring proper steering operation and preventing damage.
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
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
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 torque specification for the lug nuts on a 1990-1996 Infiniti q45?
Q1
What IS the torque specification for the lug nuts on a 1990-1996 Infiniti q45?
Tighten the lug nuts to 94 lb-ft (127 Nm).
Q2 What IS the recommended torque for the oil drain plug on a 1990-1996 Infiniti q45?
Q2
What IS the recommended torque for the oil drain plug on a 1990-1996 Infiniti q45?
Tighten the oil drain plug to 29 lb-ft (39 Nm).
Q3 What IS the torque specification for the spark plugs on a 1990-1996 Infiniti q45?
Q3
What IS the torque specification for the spark plugs on a 1990-1996 Infiniti q45?
Tighten the spark plugs to 18 lb-ft (24 Nm).
Q4 What type of torque wrench should I use for the suspension components on a 1990-1996 Infiniti q45?
Q4
What type of torque wrench should I use for the suspension components on a 1990-1996 Infiniti q45?
Use a calibrated torque wrench with a range that covers the required torque specifications.
Q5 What IS the proper procedure for tightening bolts to yield on the 1990-1996 Infiniti q45?
Q5
What IS the proper procedure for tightening bolts to yield on the 1990-1996 Infiniti q45?
Tighten the bolt to the specified torque, then turn it an additional 90 degrees. Use a new bolt for this procedure.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 q45.
- Digital display for accurate readings
- Audible alarm when target torque IS reached
- Multiple units (Nm, ft-lb, in-lb)
- Reversible ratcheting mechanism
Service Procedures
Bolt Tightening Sequence for Cylinder Head
Cylinder head bolt tightening procedure, including torque specifications for 1990-1996 Infiniti q45
- Clean bolt threads and contact surfaces
- Lubricate bolts with engine oil
- Tighten bolts to 25 Nm in sequence, starting from the center
- Further tighten bolts to 60 Nm in sequence
- Final tighten bolts to 70 Nm in sequence
Rear Suspension Subassembly Removal and Installation
Procedure for removing and installing the rear suspension subassembly, including torque specifications for related bolts and nuts
- Safety precautions and warnings
- Disconnect battery negative terminal
- Remove rear wheels
- Remove brake calipers and rotors
- Disconnect sway bar links
- Unbolt and lower subassembly
- Inspect and replace worn components
- Install subassembly and tighten bolts to 60 Nm
- Install brake components and wheels
- Tighten lug nuts to 90 Nm
Technical Service Bulletins
TSB: Excessive Cylinder Head Bolt Torque
1993-05-01Addresses an issue where excessive torque applied to cylinder head bolts can cause premature failure. Revised torque specifications are provided.
1990-1993 q45
Resolution: Reduce the final torque applied to cylinder head bolts 70 Nm, replacing the previous specification of 75 Nm.
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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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