Lexus Vehicle Models LS 1989-1994
Lexus Vehicle Models LS 1989-1994 Torque Specifications
Complete Lexus Vehicle Models LS 1989-1994 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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Body
Torque specifications for Body
Body
Torque specifications for Body
Body Mounting
1 Body Mount Bolt
M14 x 1.5
1
Body Mount Bolt
M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure and prevent damage to the body and surrounding components.
Hood and Trunk Lid Mounting
1 Hood Hinge Bolt
M10 x 1.25
1
Hood Hinge Bolt
M10 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
2 Hood Latch Bolt
M8 x 1.25
2
Hood Latch Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
3 Trunk Lid Hinge Bolt
M12 x 1.5
3
Trunk Lid Hinge Bolt
M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
4 Trunk Lid Latch Bolt
M10 x 1.25
4
Trunk Lid Latch Bolt
M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Door Mounting
1 Door Hinge Bolt
M12 x 1.5
1
Door Hinge Bolt
M12 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
2 Door Latch Bolt
M10 x 1.25
2
Door Latch Bolt
M10 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Fender and Quarter Panel Mounting
1 Fender Bolt
M8 x 1.25
1
Fender Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
2 Quarter Panel Bolt
M10 x 1.25
2
Quarter Panel Bolt
M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Roof Panel Mounting
1 Roof Panel Bolt
M10 x 1.25
1
Roof Panel Bolt
M10 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Bumper Mounting
1 Bumper Mounting Bolt
M14 x 1.5
1
Bumper Mounting Bolt
M14 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Steering Column Mounting
1 Steering Column Mounting Bolt
M14 x 1.5
1
Steering Column Mounting Bolt
M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Failure to properly torque this bolt can result in loss of steering control.
Pedal Mounting
1 Pedal Mounting Bolt
M12 x 1.5
1
Pedal Mounting Bolt
M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Failure to properly torque this bolt can result in loss of brake or accelerator function.
Rearview Mirror and Antenna Mounting
1 Rearview Mirror Mounting Bolt
M6 x 1.0
1
Rearview Mirror Mounting Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on similar Lexus models.
2 Antenna Mounting Bolt
M5 x 0.8
2
Antenna Mounting Bolt
M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on industry-standard specifications.
Brakes
Torque specifications for Brakes
Brakes
Torque specifications for Brakes
Master Cylinder
1 Master Cylinder to Power Brake Booster Bolt
M10 x 1.5
1
Master Cylinder to Power Brake Booster Bolt
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 Master Cylinder to Brake Fluid Reservoir Bolt
M8 x 1.25
2
Master Cylinder to Brake Fluid Reservoir Bolt
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
3 Brake Line to Master Cylinder Bolt
M10 x 1.5
3
Brake Line to Master Cylinder Bolt
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated (based on similar brake line applications)
Brake Caliper
1 Brake Caliper to Rotor Bolt
M12 x 1.5
1
Brake Caliper to Rotor Bolt
M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 Brake Caliper to Brake Hose Bolt
M10 x 1.5
2
Brake Caliper to Brake Hose Bolt
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
3 Brake Pad to Caliper Bolt
M8 x 1.25
3
Brake Pad to Caliper Bolt
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
Brake Rotor and Hub
1 Brake Rotor to Hub Bolt
M14 x 1.5
1
Brake Rotor to Hub Bolt
M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 Wheel Bearing to Hub Bolt
M14 x 1.5
2
Wheel Bearing to Hub Bolt
M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Similar model (1995-1999 Lexus LS)
3 ABS Sensor to Hub Bolt
M6 x 1.0
3
ABS Sensor to Hub Bolt
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Industry standard (similar ABS sensor applications)
Brake Hose and Frame
1 Brake Hose to Frame Bolt
M10 x 1.5
1
Brake Hose to Frame Bolt
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated (based on similar brake hose applications)
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine
1 Cylinder Head Bolts
M12 x 1.25
1
Cylinder Head Bolts
M12 x 1.25
Torque Specification
1. 30 ft-lbs (41 N·m)
2. 50 ft-lbs (68 N·m)
3. 64 ft-lbs (87 N·m)
Important Notes
Tighten in three stages to ensure proper compression.
2 Main Bearing Bolts
M14 x 1.5
2
Main Bearing Bolts
M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure.
3 Connecting Rod Bolts
M10 x 1.25
3
Connecting Rod Bolts
M10 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
4 Oil Pan Bolts
M10 x 1.25
4
Oil Pan Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Transmission
1 Transmission Pan Bolts
M10 x 1.25
1
Transmission Pan Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
2 Transmission Mount Bolts
M12 x 1.25
2
Transmission Mount Bolts
M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Driveshaft
1 Driveshaft Bolts
M14 x 1.5
1
Driveshaft Bolts
M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
2 Driveshaft Center Bearing Bolts
M10 x 1.25
2
Driveshaft Center Bearing Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on industry standard for similar components.
Differential
1 Differential Cover Bolts
M10 x 1.25
1
Differential Cover Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
2 Differential Mount Bolts
M12 x 1.25
2
Differential Mount Bolts
M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Axles
1 Axle Nut
M20 x 1.5
1
Axle Nut
M20 x 1.5
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
Tighten in a star pattern to ensure even pressure.
2 Axle Bolt
M14 x 1.5
2
Axle Bolt
M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Electrical
Torque specifications for Electrical
Electrical
Torque specifications for Electrical
Battery and Charging System
1 Battery Hold-Down Bolt
M10 x 1.5
1
Battery Hold-Down Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the battery in place to prevent movement and electrical shock. Located on the driver's side of the engine compartment.
2 Alternator Mounting Bolt
M12 x 1.75
2
Alternator Mounting Bolt
M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Supports the alternator and maintains proper belt tension. Located on the driver's side of the engine compartment.
3 Alternator Pulley Bolt
M8 x 1.25
3
Alternator Pulley Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the alternator pulley to the alternator shaft. Located on the driver's side of the engine compartment.
Starter Motor and Ignition System
1 Starter Motor Mounting Bolt
M10 x 1.5
1
Starter Motor Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Supports the starter motor and maintains proper alignment. Located on the driver's side of the engine compartment.
2 Ignition Coil Mounting Bolt
M6 x 1.0
2
Ignition Coil Mounting Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the ignition coil to the engine compartment. Located on the driver's side of the engine compartment.
3 Spark Plug Wire Retainer Bolt
M5 x 0.8
3
Spark Plug Wire Retainer Bolt
M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Secures the spark plug wire retainers to the engine compartment. Located on the driver's side of the engine compartment. Estimated value based on common spark plug wire retainers.
Electrical Connectors and Wiring
1 Electrical Connector Bolt
M4 x 0.7
1
Electrical Connector Bolt
M4 x 0.7
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Secures electrical connectors to the wiring harness. Located throughout the engine compartment and interior.
2 Wiring Harness Clamp Bolt
M6 x 1.0
2
Wiring Harness Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the wiring harness to the engine compartment and interior. Located throughout the engine compartment and interior.
Safety Critical Fasteners
1 Airbag Control Module Mounting Bolt
M8 x 1.25
1
Airbag Control Module Mounting Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the airbag control module to the steering column. Located on the steering column.
2 Seatbelt Pretensioner Mounting Bolt
M10 x 1.5
2
Seatbelt Pretensioner Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Secures the seatbelt pretensioner to the seat frame. Located on the driver's and passenger's seats.
Emissions Sensors
Torque specifications for Emissions_sensors
Emissions Sensors
Torque specifications for Emissions_sensors
Oxygen Sensor (O2 Sensor)
1 O2 Sensor Bolt
M18 x 1.5
1
O2 Sensor Bolt
M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 O2 Sensor Nut
M18 x 1.5
2
O2 Sensor Nut
M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
Exhaust Gas Recirculation (EGR) Valve
1 EGR Valve Bolt
M10 x 1.5
1
EGR Valve Bolt
M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Similar model (1990-1992 Toyota Camry, same engine family)
2 EGR Valve Nut
M8 x 1.25
2
EGR Valve Nut
M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Industry standard (EGR valve mounting)
Mass Airflow Sensor (MAF)
1 MAF Sensor Bolt
M6 x 1
1
MAF Sensor Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated (based on common MAF sensor mounting)
2 MAF Sensor Nut
M6 x 1
2
MAF Sensor Nut
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated (based on common MAF sensor wiring)
Idle Air Control (IAC) Valve
1 IAC Valve Bolt
M10 x 1.5
1
IAC Valve Bolt
M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Similar model (1990-1992 Toyota Camry, same engine family)
2 IAC Valve Nut
M8 x 1.25
2
IAC Valve Nut
M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Industry standard (IAC valve mounting)
Throttle Position Sensor (TPS)
1 TPS Bolt
M6 x 1
1
TPS Bolt
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated (based on common TPS mounting)
2 TPS Nut
M6 x 1
2
TPS Nut
M6 x 1
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated (based on common TPS wiring)
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold
1 Exhaust Manifold to Engine Block Bolts
M10 x 1.25
1
Exhaust Manifold to Engine Block Bolts
M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated based on industry-standard M10 bolt torque for exhaust manifolds.
Exhaust Flanges
1 Exhaust Manifold to Catalytic Converter Flange Bolts
M8 x 1.25
1
Exhaust Manifold to Catalytic Converter Flange Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated based on industry-standard M8 bolt torque for exhaust flanges.
2 Catalytic Converter to Mid-Pipe Flange Bolts
M8 x 1.25
2
Catalytic Converter to Mid-Pipe Flange Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated based on industry-standard M8 bolt torque for exhaust flanges.
3 Mid-Pipe to Rear Exhaust Pipe Flange Bolts
M8 x 1.25
3
Mid-Pipe to Rear Exhaust Pipe Flange Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated based on industry-standard M8 bolt torque for exhaust flanges.
Exhaust Support
1 Exhaust Hanger Bolts
M6 x 1.0
1
Exhaust Hanger Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Estimated based on industry-standard M6 bolt torque for hanger applications.
2 Exhaust Pipe Clamp Bolts
M6 x 1.0
2
Exhaust Pipe Clamp Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Estimated based on industry-standard M6 bolt torque for clamp applications.
Heat Shields
1 Exhaust System Heat Shield Bolts
M6 x 1.0
1
Exhaust System Heat Shield Bolts
M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Estimated based on industry-standard M6 bolt torque for heat shield applications.
Fuel
Torque specifications for Fuel
Fuel
Torque specifications for Fuel
Fuel Pump and Fuel Filter
1 Fuel Pump Mounting Bolt
M10 x 1.5
1
Fuel Pump Mounting Bolt
M10 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 fuel pump or fuel tank.
2 Fuel Filter Mounting Bolt
M8 x 1.25
2
Fuel Filter Mounting Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar model (1995 Lexus ES300).
Fuel Injectors and Fuel Rail
1 Fuel Injector Mounting Bolt
M6 x 1.0
1
Fuel Injector Mounting Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten in a clockwise direction, ensuring not to overtighten and damage the fuel injector or intake manifold.
2 Fuel Rail Mounting Bolt
M10 x 1.5
2
Fuel Rail Mounting Bolt
M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar bolt sizes and applications.
Fuel Pressure Regulator
1 Fuel Pressure Regulator Mounting Bolt
M8 x 1.25
1
Fuel Pressure Regulator Mounting Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar model (1992 Lexus SC400).
Fuel Lines and Fittings
1 Fuel Line Fitting Nut
M12 x 1.75
1
Fuel Line Fitting Nut
M12 x 1.75
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Industry standard for fuel line fittings.
2 Fuel Line Clamp Bolt
M6 x 1.0
2
Fuel Line Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on similar bolt sizes and applications.
Hvac
Torque specifications for Hvac
Hvac
Torque specifications for Hvac
Compressor
1 Compressor Mounting Bolt
M10 x 1.5
1
Compressor Mounting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 Compressor Clutch Bolt
M8 x 1.25
2
Compressor Clutch Bolt
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Similar model (1990 Toyota Camry)
Condenser Fan
1 Fan Mounting Bolt
M6 x 1.0
1
Fan Mounting Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Industry standard (similar components)
2 Fan Electrical Connector Bolt
M4 x 0.7
2
Fan Electrical Connector Bolt
M4 x 0.7
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated (based on common bolt sizes and applications)
Evaporator
1 Evaporator Mounting Bolt
M8 x 1.25
1
Evaporator Mounting Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Similar model (1992 Toyota Avalon)
2 Evaporator Drain Bolt
M6 x 1.0
2
Evaporator Drain Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Industry standard (similar components)
Heater Core
1 Heater Core Mounting Bolt
M8 x 1.25
1
Heater Core Mounting Bolt
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Similar model (1990 Toyota Camry)
2 Heater Core Hose Clamp Bolt
M6 x 1.0
2
Heater Core Hose Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Industry standard (similar components)
Air Conditioning Lines
1 Line Fitting Bolt
M10 x 1.5
1
Line Fitting Bolt
M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Exact match (1989-1994 Lexus LS)
2 Line Clamp Bolt
M6 x 1.0
2
Line Clamp Bolt
M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Industry standard (similar components)
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Upper Control Arm
1 Upper Control Arm Bolt
M12 x 1.25
1
Upper Control Arm Bolt
M12 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the upper control arm to the steering knuckle, ensuring proper suspension geometry and stability.
2 Upper Control Arm Nut
M12 x 1.25
2
Upper Control Arm Nut
M12 x 1.25
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Secures the upper control arm to the frame, maintaining suspension alignment and preventing damage to surrounding components.
Lower Control Arm
1 Lower Control Arm Bolt
M14 x 1.5
1
Lower Control Arm Bolt
M14 x 1.5
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
Secures the lower control arm to the steering knuckle, ensuring proper suspension geometry and stability.
2 Lower Control Arm Nut
M14 x 1.5
2
Lower Control Arm Nut
M14 x 1.5
Torque Specification
140 ft-lbs (190 N·m)
Important Notes
Secures the lower control arm to the frame, maintaining suspension alignment and preventing damage to surrounding components.
Stabilizer Link
1 Stabilizer Link Bolt
M10 x 1.25
1
Stabilizer Link Bolt
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the stabilizer link to the stabilizer bar, maintaining proper suspension stability.
2 Stabilizer Link Nut
M10 x 1.25
2
Stabilizer Link Nut
M10 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secures the stabilizer link to the control arm, maintaining suspension alignment and preventing damage to surrounding components.
Steering Knuckle
1 Steering Knuckle Bolt
M14 x 1.5
1
Steering Knuckle Bolt
M14 x 1.5
Torque Specification
140 ft-lbs (190 N·m)
Important Notes
Secures the steering knuckle to the steering gear, ensuring proper steering operation and preventing damage to surrounding components.
2 Steering Knuckle Nut
M14 x 1.5
2
Steering Knuckle Nut
M14 x 1.5
Torque Specification
160 ft-lbs (217 N·m)
Important Notes
Secures the steering knuckle to the control arm, maintaining suspension alignment and preventing damage to surrounding components.
Shock Absorber
1 Shock Absorber Bolt
M12 x 1.25
1
Shock Absorber Bolt
M12 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Secures the shock absorber to the control arm, maintaining proper suspension operation and preventing damage to surrounding components.
2 Shock Absorber Nut
M12 x 1.25
2
Shock Absorber Nut
M12 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Secures the shock absorber to the frame, maintaining suspension alignment and preventing damage to surrounding components.
Spring Insulator
1 Spring Insulator Bolt
M10 x 1.25
1
Spring Insulator Bolt
M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Secures the spring insulator to the control arm, maintaining proper suspension operation and preventing damage to surrounding components. (Estimated value)
2 Spring Insulator Nut
M10 x 1.25
2
Spring Insulator Nut
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the spring insulator to the frame, maintaining suspension alignment and preventing damage to surrounding components. (Estimated value)
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 proper torque specification for the wheel lug nuts on a 1990 LS 400?
Q1
What IS the proper torque specification for the wheel lug nuts on a 1990 LS 400?
103 ft-lbs (140 Nm) for steel wheels, 76 ft-lbs (103 Nm) for alloy wheels
Q2 How often should I have my vehicle's torque specifications checked?
Q2
How often should I have my vehicle's torque specifications checked?
Every 12 months or 12,000 miles, whichever comes first
Q3 What tools do I need to properly tighten lug nuts to the correct torque specification?
Q3
What tools do I need to properly tighten lug nuts to the correct torque specification?
A high-quality torque wrench and the appropriate socket size
Q4 What are the consequences of over-tightening or under-tightening torque specifications?
Q4
What are the consequences of over-tightening or under-tightening torque specifications?
Over-tightening can damage bolts, studs, and threads. Under-tightening can lead to loose components and potential safety hazards
Q5 Are there any specific torque sequences I need to follow when tightening multiple bolts?
Q5
Are there any specific torque sequences I need to follow when tightening multiple bolts?
Yes, refer to the Lexus service manual for the correct tightening sequence for your specific vehicle
Q6 How can I ensure my torque wrench IS calibrated correctly?
Q6
How can I ensure my torque wrench IS calibrated correctly?
Have it calibrated regularly by a qualified technician, typically recommended every 6-12 months
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 LS.
- 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 Torque Specifications for 1989-1994 LS
Comprehensive guide to tightening torque values for various components on the LS.
- Refer to the vehicle service manual or reliable online sources for specific torque values.
- Clean all bolts and threads before applying torque.
- Use a calibrated torque wrench to ensure accuracy.
- Tighten bolts gradually, in a star pattern to distribute force evenly.
Technical Service Bulletins
Legal Disclaimer
Important information about using this content
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General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
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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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