Lexus SC300 / Lexus SC400. Manual - part 314

INSTALLATION

PRE-WELDING MEASUREMENTS
Always take measurements 
before installing underbody 
or engine components 
to insure correct assembly.
After installation, confirm 
proper fit.

POST-WELDING REFINISH-
ING
1.

Always check the welded
spots to insure they are
secure.

2.

When smoothing out the
weld spots with a disc
grinder, be careful not to
grind off too much as this
would weaken the weld.

WELDING PRECAUTIONS
1.

The number of welding spots
should be as follows.
Spot weld: 1.3 x No. of
manufacturer’s spots.
Plug weld: More than No. of
manufacturer’s plugs.

WRONG

OKAY

WRONG

2.

Plug welding should be done
with a MIG (Metal Inert Gas)
welder. Do not gas weld or
braze panels at areas other
than specified.

Safety Glass

Body
Measurement
Diagrams

SPOT WELDING PRECAUTIONS

SPOT WELD LOCATIONS
Try to avoid welding over
previous spots.

1.

The shape of the welding
tip point has an effect on
the strength of the weld.

2.

Always insure that the
seams and welding tip are
free of paint.

Old
Spot
Locations

New Spot
Locations

Tip Cutter

INTRODUCTION

IN-13

ANTI-RUST  TREATMENT

When replacing body panels, always apply body sealer, anti-rust agent or undercoat according to the re-
quirements of your country.
HINT: For further details, see the description given in Section AR of this manual.

ANTI-RUST AGENT (WAX)

Apply anti-rust agent to 
following sections.

Inside of the hems of the
doors and hood.

Around the hinges of the
doors and hood.

Inside of the welded parts
with boxed cross-section.

BODY SEALER
Apply body sealer to the
required areas.

Cartridge
Type

Tube
Type

UNDERCOAT
Apply undercoat to the underbody and
wheel housings.

Spray Gun

Undercoating
(Water base)

Undercoating
(Oil base)

INTRODUCTION

IN-14

N01093
N01094

SUPPORT POSITION

PANTOGRAPH JACK POSITION

Front

Center of suspension crossmember

. . . . . . . . 

Rear

Jack up support of differential carrier

. . . . . . . . . 

JACK POSITION

Jack

or

Suspension Crossmember

Front

Safety stand  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

VEHICLE LIFT AND SUPPORT LOCATIONS

INTRODUCTION

IN-15

SERVICE SPECIFICATIONS

SERVICE DATA

Thermostat

Valve opening temperature

80–84

°

C

176–183

°

F

Valve lift

at 95

°

C (203

°

F)

10 mm

0.39 in.

Radiator cap

Relief valve opening pressure

STD

74–103 kPa

(0.75–1.05 kgf/cm, 10.7–14.9 psi)

Limit

59 kPa

0.6 kgf/cm

8.5 psi

On–vehicle 
i

ti

f

h

Oil pressure

1,177–2,452 kPa

inspection for hy-
draulic cooling

(12–25 kgf/cm, 171–356 psi)

draulic cooling
fan

fan

Hydraulic pump

Spool valve

45.8 mm

1.803 in.

Rotor side clearance

STD

Drive rotor

0.02 mm

0.0008 in.

Driven rotor

0.03 mm

0.0012 in.

Limit

Drive rotor

0.03 mm

0.0012 in.

Driven rotor

0.04 mm

0.0016 in.

Rotor body clearance

STD

0.05–0.09 mm

0.0020–0.0035 in.

Limit

0.10 mm

0.0039 in.

Rotor tip clearance

STD

0.02 mm

0.0008 in.

Limit

0.03 mm

0.0012 in.

Drive shaft bushing inside diameter

17.00–17.05 mm

0.6693–0.6713 in.

Drive shaft diameter

16.97–16.98 mm

0.6681–0.6685 in.

Drive shaft oil clearance

STD

0.02–0.08 mm

0.0008–0.0031 in.

Limit

0.08 mm

0.0031 in.

Drive shaft preload (rotating torque)

0.3 N

⋅

m

3.0 kgf

⋅

cm

2.6 in.

⋅

lbf

Solenoid valve resistance

at cold

7.5–8.5 

Hydraulic motor

Rotor side clearance

STD

0.01–0.04 mm

0.0004–0.0016 in.

Limit

0.05 mm

0.0020 mm

Drive shaft hole inside diameter

14.000–14.011 mm

0.5512–0.5516 in.

Drive shaft diameter

13.973–13.984 mm

0.5501–0.5506 in.

Drive shaft oil clearance

STD

0.016–0.038 mm

0.0006–0.0015 in.

Limit

0.04 mm

0.0031 in.

Drive shaft preload (rotating torque)

0.3 N

⋅

m

3.0 kgf

⋅

cm

2.6 in.

⋅

lbf

Water temp. 

Resistance

at 80

°

C (176

°

F)

1.48–1.58 k

sensor

CO–64

–

COOLIING SYSTEM

Service Specifications