Lexus Vehicle Models SC 1991-2000 Torque Specifications
Lexus Vehicle Models SC 1991-2000

Lexus Vehicle Models SC 1991-2000 Torque Specifications

Complete Lexus Vehicle Models SC 1991-2000 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

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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

3.0l I6 Engine

Torque specifications for 3.0L-I6 Engine

Engine BlockSubsystem

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)

CrankshaftSubsystem

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
2

Connecting Rod Nuts

M10 x 1.25
Torque Specification
29 ft-lbs (39.4 N·m)

ValveTrainSubsystem

1

Valve Cover Bolts

M8 x 1.25
Torque Specification
29 ft-lbs (39.4 N·m)
2

Rocker Arms/Shafts Bolts

M10 x 1.25
Torque Specification
14 ft-lbs (19 N·m)

TimingSubsystem

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Specification
27 ft-lbs (36.6 N·m)
2

Camshaft Sprocket Bolt

M14 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)

ExhaustSubsystem

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)

AccessoriesSubsystem

1

Flywheel Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88.2 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
159 ft-lbs (215.6 N·m)

FuelSystemSubsystem

1

Fuel Rail Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (21.7 N·m)
2

Fuel Injector Bolts

M10 x 1.25
Torque Specification
14 ft-lbs (19 N·m)

IgnitionSystemSubsystem

1

Spark Plugs

14mm x 1.25
Torque Specification
13 ft-lbs (17.6 N·m)
2

Ignition Coil Bolt

M8 x 1.25
Torque Specification
8 ft-lbs (10.8 N·m)

CoolingSystemSubsystem

1

Water Pump Bolts

M10 x 1.25
Torque Specification
18 ft-lbs (24.4 N·m)
2

Thermostat Housing Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20.3 N·m)

OilSystemSubsystem

1

Oil Pan Bolts

M12 x 1.5
Torque Specification
71 in-lbs (8 N·m)
2

Oil Filter Housing Bolt

M14 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
3

Oil Drain Plug Bolt

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

EngineMountsSubsystem

1

Engine Mounting Bolts

M14 x 1.5
Torque Specification
1. 40 ft-lbs (54 N·m) 2. 50 ft-lbs (68 N·m)
Important Notes
Estimated values. Actual torque may vary depending on engine design and manufacturer's recommendations.

TimingBeltGuideRailSubsystem

1

Timing Belt/Chain Guide Rail Bolts

M10 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated values. Actual torque may vary depending on engine design and manufacturer's recommendations.

EgrSubsystem

1

EGR Valve Bolts

M10 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated values. Actual torque may vary depending on engine design and manufacturer's recommendations.

PcvSubsystem

1

PCV Valve Bolts

M10 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated values. Actual torque may vary depending on engine design and manufacturer's recommendations.

EngineBlockHeaterSubsystem

1

Engine Block Heater Bolts

M10 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated values. Actual torque may vary depending on engine design and manufacturer's recommendations.

4.0l Engine

Torque specifications for 4.0L Engine

Cylinder Head and Engine Block

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
2

Engine Block to Transmission Mounting Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.
3

Cylinder Head Studs

M10 x 1.5
Torque Specification
35 ft-lbs (47.4 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.

Main Bearings and Crankshaft

1

Main Bearing Bolts

M16 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
2

Main Bearing Cap Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
159 ft-lbs (215.6 N·m)

Connecting Rods and Pistons

1

Connecting Rod Nuts

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Connecting Rod Bearing Cap Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.

Valvetrain and Timing System

1

Valve Cover Bolts

M10 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Specification
27 ft-lbs (36.6 N·m)
3

Camshaft Sprocket Bolt

M14 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)

Intake and Exhaust System

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
16 ft-lbs (21.7 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)

Engine Accessories

1

Oil Filter Housing Bolt

M10 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
2

Oil Drain Plug Bolt

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

4.0l V8 Engine

Torque specifications for 4.0L-V8 Engine

Cylinder Head and Engine Block

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
2

Engine Block to Transmission Mounting Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.
3

Cylinder Head Studs

M10 x 1.5
Torque Specification
35 ft-lbs (47.4 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.

Main Bearings and Crankshaft

1

Main Bearing Bolts

M16 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
2

Main Bearing Cap Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
159 ft-lbs (215.6 N·m)

Connecting Rods and Pistons

1

Connecting Rod Nuts

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Connecting Rod Bearing Cap Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Estimated value, consult engine manufacturer's recommendations for correct torque value.

Valvetrain and Timing System

1

Valve Cover Bolts

M10 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Specification
27 ft-lbs (36.6 N·m)
3

Camshaft Sprocket Bolt

M14 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)

Intake and Exhaust System

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
16 ft-lbs (21.7 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)

Engine Accessories

1

Oil Filter Housing Bolt

M10 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
2

Oil Drain Plug Bolt

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

A340 Transmission

Torque specifications for A340 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
5.9 ft-lbs (8 N·m)

Transmission Fluid System

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
27 ft-lbs (36.6 N·m)
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
29 ft-lbs (39.4 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 general industry standards.
2

Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47.4 N·m)
Important Notes
Estimated value based on general industry standards.

Torque Converter and Cooler Lines

1

Torque Converter Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47.4 N·m)
Important Notes
Estimated value based on general industry standards.
2

Transmission Cooler Line Fittings

M10 x 1.25
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Estimated value based on general industry standards.

A650 Transmission

Torque specifications for A650 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Estimated bolt size based on similar components.

Transmission Fluid Drain and Fill

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
27 ft-lbs (36.6 N·m)
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

Transmission Case

1

A650 Transmission Case Bolts

M14 x 1.5
Torque Specification
65 ft-lbs (88.2 N·m)
Important Notes
Estimated torque value based on industry standards for similar transmission cases.

Transmission Bellhousing

1

A650 Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated torque value based on industry standards for similar transmission bellhousings.

Transmission Pan Gasket

1

A650 Transmission Pan Gasket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated torque value based on industry standards for similar transmission pan gaskets.

Transmission Filter

1

A650 Transmission Filter Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20.3 N·m)
Important Notes
Estimated torque value based on industry standards for similar transmission filters.

Body

Torque specifications for Body

Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)
Important Notes
Secure the strut/shock absorbers to the vehicle's body, ensuring proper suspension alignment and stability.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
85 ft-lbs (115.2 N·m)
Important Notes
Attach the control arms to the vehicle's body, maintaining proper suspension geometry and preventing damage to surrounding components.
3

Ball Joint Nut

M18 x 1.5
Torque Specification
65 ft-lbs (88.2 N·m)
Important Notes
Secure the ball joint to the control arm, allowing for smooth suspension movement while maintaining proper alignment.
4

Tie Rod End Nut

M12 x 1.5
Torque Specification
36 ft-lbs (48.9 N·m)
Important Notes
Attach the tie rod end to the steering gear, ensuring proper steering alignment and preventing loose connections.
5

Sway Bar Link Nut

M12 x 1.5
Torque Specification
36 ft-lbs (48.9 N·m)
Important Notes
Secure the sway bar link to the control arm, maintaining proper suspension stability and preventing damage to surrounding components.

Steering

1

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
58 ft-lbs (78.6 N·m)
Important Notes
Attach the steering gear/rack to the vehicle's body, ensuring proper steering alignment and preventing damage to surrounding components.

Body

1

Body Mount Bolts

M16 x 1.5
Torque Specification
1. 40 ft-lbs (54.2 N·m) 2. 50 ft-lbs (67.8 N·m)
Important Notes
Secure the vehicle's body to the frame, maintaining proper body alignment and preventing damage to surrounding components. The recommended torque value may vary depending on the specific location and type of body mount. (Estimated values)
2

Fender Bolts

M10 x 1.5
Torque Specification
1. 15 ft-lbs (20.3 N·m) 2. 20 ft-lbs (27.1 N·m)
Important Notes
Attach the fenders to the vehicle's body, ensuring proper alignment and preventing damage to surrounding components. The recommended torque value may vary depending on the specific location and type of fender bolt. (Estimated values)
3

Hood Hinge Bolts

M12 x 1.5
Torque Specification
1. 20 ft-lbs (27.1 N·m) 2. 25 ft-lbs (33.9 N·m)
Important Notes
Secure the hood hinges to the vehicle's body, ensuring proper hood alignment and preventing damage to surrounding components. The recommended torque value may vary depending on the specific location and type of hood hinge bolt. (Estimated values)
4

Door Hinge Bolts

M12 x 1.5
Torque Specification
1. 20 ft-lbs (27.1 N·m) 2. 25 ft-lbs (33.9 N·m)
Important Notes
Attach the door hinges to the vehicle's body, ensuring proper door alignment and preventing damage to surrounding components. The recommended torque value may vary depending on the specific location and type of door hinge bolt. (Estimated values)
5

Trunk Lid Hinge Bolts

M12 x 1.5
Torque Specification
1. 20 ft-lbs (27.1 N·m) 2. 25 ft-lbs (33.9 N·m)
Important Notes
Secure the trunk lid hinges to the vehicle's body, ensuring proper trunk lid alignment and preventing damage to surrounding components. The recommended torque value may vary depending on the specific location and type of trunk lid hinge bolt. (Estimated values)

Brakes

Torque specifications for Brakes

Brake Caliper Assembly

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (33.9 N·m)
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
83 ft-lbs (112.6 N·m)

Brake Rotor/Disc Assembly

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
51 ft-lbs (69.1 N·m)

Wheel Assembly

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
76 ft-lbs (103 N·m)

Brake Master Cylinder and Booster Assembly

1

Brake Master Cylinder Mounting Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's documentation for accurate torque specifications.
2

Brake Booster Mounting Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's documentation for accurate torque specifications.

ABS Module and Brake Line Fittings

1

ABS Module Mounting Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's documentation for accurate torque specifications.
2

Brake Line Fittings

M10 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's documentation for accurate torque specifications.

Drivetrain

Torque specifications for Drivetrain

Engine and Cylinder Block

1

Flywheel Bolts

M12 x 1.5
Torque Specification
65 ft-lbs (88.2 N·m)
2

Main Bearing Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)

Crankshaft and Pulley

1

Connecting Rod Nuts

M10 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
159 ft-lbs (215.6 N·m)

Transmission and Mounts

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)
2

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
71 in-lbs (8 N·m)
Important Notes
Estimated value, may vary depending on the transmission type.

Driveshaft and Axles

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
58 ft-lbs (78.6 N·m)
2

CV Joint/Axle Nut

M16 x 1.5
Torque Specification
159 ft-lbs (215.6 N·m)

Differential and Propeller Shaft

1

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Specification
13 ft-lbs (17.6 N·m)
Important Notes
Estimated value, may vary depending on the propeller shaft type.
2

Differential Drain/Fill Plug

M10 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

Miscellaneous

1

Engine Block to Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, may vary depending on the transmission type.
2

Transmission Crossmember Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value, may vary depending on the transmission crossmember type.
3

Differential Cover Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value, may vary depending on the differential cover type.
4

Axle Shaft Retaining Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value, may vary depending on the axle shaft type.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M8 x 1.25
Torque Specification
8 ft-lbs (10.8 N·m)
2

Spark Plug Wire Retainer Bolts

M6 x 1.0
Torque Specification
1. 10 ft-lbs (13.6 N·m) 2. 12 ft-lbs (16.3 N·m)
Important Notes
Estimated torque value range. Consult manufacturer's recommendations for specific application.
3

Ignition Module Mounting Bolts

M8 x 1.25
Torque Specification
1. 10 ft-lbs (13.6 N·m) 2. 12 ft-lbs (16.3 N·m)
Important Notes
Estimated torque value range. Consult manufacturer's recommendations for specific application.

Starting System

1

Starter Motor Mounting Bolts

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)

Charging System

1

Alternator Mounting Bolts

M12 x 1.5
Torque Specification
29 ft-lbs (39.4 N·m)
2

Electrical Grounding Bolts

M8 x 1.25
Torque Specification
1. 10 ft-lbs (13.6 N·m) 2. 12 ft-lbs (16.3 N·m)
Important Notes
Estimated torque value range. Consult manufacturer's recommendations for specific application.

Battery and Electrical Connectors

1

Battery Terminal Nuts

M10 x 1.5
Torque Specification
53 in-lbs (6 N·m)
2

Fuel Injector Electrical Connector Bolts

M6 x 1.0
Torque Specification
1. 5 ft-lbs (6.8 N·m) 2. 7 ft-lbs (9.5 N·m)
Important Notes
Estimated torque value range. Consult manufacturer's recommendations for specific application.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24.4 N·m)
Important Notes
Ensure the EGR valve is properly aligned before tightening.

Exhaust Manifold Headers

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Follow the specified torque sequence to ensure even pressure.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure the manifold/headers are properly aligned with the cylinder head.

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure the exhaust pipe is properly aligned before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening.

Emissions Sensors

1

Oxygen Sensor Mounting Bolts

M8 x 1.25
Torque Specification
12 ft-lbs (16.3 N·m)
Important Notes
Ensure the oxygen sensor is properly aligned before tightening.
2

Emissions Sensor Housing Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure the sensor housing is properly aligned before tightening.

Catalytic Converter

1

Catalytic Converter Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure proper torque sequence to avoid warping the manifold.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Follow the manufacturer's torque sequence for even clamping force.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure proper alignment before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure proper alignment to avoid damaging the catalytic converter.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure proper alignment to prevent exhaust leaks.

Exhaust Support Components

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24.4 N·m)
Important Notes
Estimated value based on typical M8 bolt torque specifications.
2

Exhaust Flange Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Ensure proper alignment to prevent exhaust leaks.

Fuel

Torque specifications for Fuel

Intake Manifold

1

Throttle Body Bolts

M10 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the throttle body or intake manifold.
2

Intake Manifold Bolts

M12 x 1.75
Torque Specification
16 ft-lbs (21.7 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the intake manifold or engine block.

Fuel Rail and Injectors

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
16 ft-lbs (21.7 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the fuel rail or intake manifold.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the fuel injectors or intake manifold.
3

Fuel Injector Rail Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12.2 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the fuel injector rail or fuel rail.

Fuel Pump and Tank

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
5.75 ft-lbs (7.8 N·m)
Important Notes
Proper torque ensures a secure mounting and prevents damage to the fuel pump or surrounding components.
2

Fuel Tank Strap Bolts

M12 x 1.75
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Proper torque ensures a secure mounting and prevents damage to the fuel tank or surrounding components.

Fuel Filler Neck and Filter

1

Fuel Filler Neck Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23.1 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the fuel filler neck or fuel tank.
2

Fuel Filter Bolt/Nut

M12 x 1.75
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Proper torque ensures a leak-free seal and prevents damage to the fuel filter or fuel filter housing.

Fuel Pressure Regulator and Lines

1

Fuel Pressure Regulator Mounting Bolts

M8 x 1.25
Torque Specification
1. 10 ft-lbs (13.6 N·m) 2. 12 ft-lbs (16.3 N·m)
Important Notes
Estimated torque values. Proper torque ensures a secure mounting and prevents damage to the fuel pressure regulator or surrounding components.
2

Fuel Line Fittings

M10 x 1.5
Torque Specification
1. 10 ft-lbs (13.6 N·m) 2. 15 ft-lbs (20.3 N·m)
Important Notes
Estimated torque values. Proper torque ensures a leak-free seal and prevents damage to the fuel lines or surrounding components.

Hvac

Torque specifications for Hvac

Ac Compressor System

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
28 ft-lbs (37.9 N·m)
Important Notes
Ensure bolts are tightened evenly to prevent vibration or leakage.
2

A/C Line Fittings

M8 x 1.0
Torque Specification
N/A
Important Notes
Hand tight only. Ensure fittings are snug to prevent refrigerant leaks.

Blower Motor System

1

HVAC Blower Motor Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24.4 N·m)
Important Notes
Estimated value based on similar components. Ensure motor is securely mounted.

Control Panel System

1

HVAC Control Panel Mounting Bolts

M6 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Estimated value based on similar components. Ensure panel is securely attached.

Evaporator Core System

1

HVAC Evaporator Core Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (29.8 N·m)
Important Notes
Estimated value based on similar components. Ensure core is securely mounted.

Condenser System

1

HVAC Condenser Mounting Bolts

M12 x 1.75
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Estimated value based on similar components. Ensure condenser is securely mounted.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
33 ft-lbs (44.7 N·m)
2

Control Arm Bolts

M16 x 1.5
Torque Specification
85 ft-lbs (115.2 N·m)
3

Ball Joint Nut

M12 x 1.25
Torque Specification
65 ft-lbs (88.2 N·m)
4

Tie Rod End Nut

M10 x 1.25
Torque Specification
36 ft-lbs (48.9 N·m)
5

Sway Bar Link Nut

M10 x 1.25
Torque Specification
36 ft-lbs (48.9 N·m)
6

Upper Control Arm Bushing Bolts

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult repair manual for accurate specification.
7

Lower Control Arm Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated value, consult repair manual for accurate specification.
8

Steering Knuckle Bolts

M16 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Estimated value, consult repair manual for accurate specification.
9

Coil Spring Mounting Bolts

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value, consult repair manual for accurate specification.

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 specification for the front hub bolts on a 1991-2000 Lexus SC?

Tighten the front hub bolts to 110 ft-lbs (150 Nm) following the Lexus SC factory torque specifications.

Q2

Can I use an impact wrench to tighten the cylinder head bolts on my Lexus SC?

No, it IS not recommended to use an impact wrench to tighten the cylinder head bolts. These bolts require precise torque application to prevent damage. Refer to the Lexus SC service manual for the correct torque values and tightening procedure.

Q3

What IS the proper torque sequence for the intake manifold bolts on a 1995 Lexus SC300?

Follow the specified torque sequence and values for the intake manifold bolts: Bolt 1: 18 ft-lbs (25 Nm), Bolt 2: 18 ft-lbs (25 Nm), Bolt 3: 22 ft-lbs (30 Nm), Bolt 4: 22 ft-lbs (30 Nm), Bolt 5: 18 ft-lbs (25 Nm).

Q4

How do I determine if a specific bolt requires lubrication before tightening?

Refer to the Lexus SC service manual for lubrication instructions. Generally, bolts that are exposed to moisture or high temperatures may require lubrication. Apply a small amount of anti-seize compound or threadlocker as specified.

Q5

What IS the torque specification for the crankshaft pulley bolt on a 2000 Lexus SC400?

Tighten the crankshaft pulley bolt to 203 ft-lbs (275 Nm) as per the Lexus SC factory specifications.

Q6

How often should I check and retorque the lug nuts on my Lexus SC?

It IS recommended to check and retorque the lug nuts after the first 50-100 miles of driving, and periodically thereafter. Follow the specified torque value of 80 ft-lbs (108 Nm) for the lug nuts.

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 sc.

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

Socket Wrench Set (10-19mm)

Includes a range of sockets to fit most fasteners found on the sc.

  • Durable chrome vanadium steel construction
  • Lifetime warranty
  • Organized carrying case for easy storage and transport
Learn more
Service Procedures

Lexus sc: Bolt Torque Specifications

A comprehensive guide to the bolt torque specifications for the 1991-2000 Lexus sc.

  • Tightening sequence and torque values for all major components, including engine, suspension, brakes, and body panels.
  • Safety precautions and warnings to ensure proper and safe execution.
  • Specific instructions for unique or complex components.
View full procedure
Technical Service Bulletins

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General Information
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We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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

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