Lexus SC300 / Lexus SC400. Service manual — part 318

INSTALLATION OF WATER PUMP

(See Components on page

CO–8

)

1. INSTALL

WATER

PUMP

(a) Remove any old packing (FIPG) material and be careful

not to drop any oil on the contact surfaces of the water
pump and cylinder block.

•

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket
surfaces and sealing groove.

•

Thoroughly clean all components to remove all the
loose material.

•

Using a non–residue solvent, clean both sealing
surfaces.

(b) Apply seal packing to the sealing groove of the water

pump as shown in the illustration.

Seal packing: Part No. 08826–00100 or equivalent

•

Install a nozzle that has been cut to a 2–3 mm
(0.08–0.12 in.) opening.

HINT: Avoid applying an excessive amount to the surface.

•

Parts must be assembled within 5 minutes of
application. Otherwise the material must be
removed and reapplied.

•

Immediately remove nozzle from the tube and
reinstall cap.

(c) Install a new O–ring to the water by–pass pipe end.
(d) Apply soapy water to the O–ring.

(e) Connect the water by–pass pipe end to water pump.
(f)

Install the water pump with the five bolts, two stud bolts
and nut. Uniformly tighten the bolts, stud bolts and nut.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolts 30 mm (1.18 in.) in length.

2.

INSTALL WATER INLET AND INLET HOUSING
(a) Remove any old packing (FIPG) material and be careful

not to drop any oil on the contact surfaces of the water
inlet housing and water pump.

•

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket
surfaces and sealing groove.

•

Thoroughly clean all components to remove all the
loose material.

•

Using a non–residue solvent, clean both sealing
surfaces.

CO–10

–

COOLIING SYSTEM

Water Pump

(b) Apply seal packing to the sealing groove of the water

inlet housing as shown in the illustration.

Seal packing: Part No. 08826–00100 or equivalent

•

Install a nozzle that has been cut to a 2–3 mm
(0.08–0.12 in.) opening.

HINT: Avoid applying an excessive amount to the surface.

•

Parts must be assembled within 5 minutes of
application. Otherwise the material must be
removed and reapplied.

•

Immediately remove nozzle from the tube and
reinstall cap.

(c) Install a new O–ring to the water inlet housing.
(d) Apply soapy water to the O–ring.
(e) Push the water inlet housing end into water pump hole.
(f) Install the water inlet and inlet housing assembly with

the two bolts. alternately tighten the bolts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolts 25 mm (0.98 in.) in length.
(g) Connect the water by–pass hose to the water inlet

housing.

3.

INSTALL RH IGNITION COIL
(a) Install the ignition coil with the two bolts.
(b) Connect the ignition coil connector.

4.

INSTALL TIMING BELT
(See steps 4 to 43 on pages

EM–47

to 57)

–

COOLIING SYSTEM

Water Pump

CO–11

THERMOSTAT

HINT: Removing the thermostat would decrease the cooling
efficiency. Do not remove the thermostat, even if it tends to
overheat.

COMPONENTS

REMOVAL OF THERMOSTAT

1.

DRAIN ENGINE COOLANT (See page

CO–5

)

2. REMOVE

THERMOSTAT

(a) Remove

the two nuts holding the water inlet to the water

pump, and disconnect the water inlet from the water
pump.

(b) Remove the thermostat.
(c) Remove the gasket from the thermostat.

CO–10

–

COOLING SYSTEM

Thermostat

INSPECTION OF THERMOSTAT

INSPECT THERMOSTAT

HINT: The thermostat is numbered with the valve opening
temperature.
(a) Immerse the thermostat in water and gradually heat the

water.

(b) Check the valve opening temperature.

Valve opening temperature:

80–84

°

C (176–183

°

F)

If the valve opening temperature is not as specified, replace
the thermostat.
(c) Check the valve lift.

Valve lift:

8.5 mm (0.335 in.) or more at 95

°

C (203

°

F)

If the valve lift is less than specification, replace the thermo-
stat.
(d) Check that the valve spring is tight when the thermostat

is fully closed.

If not closed, replace the thermostat.

INSTALLATION OF THERMOSTAT

(See Components on page

CO–10

)

1.

PLACE THERMOSTAT IN WATER INLET
(a) Install a new gasket to the thermostat.
(b) Align the jiggle valve of the thermostat with the

protrusion, and insert the thermostat in the water inlet.

HINT: The jiggle valve may be set within 10

°

of either side of

the prescribed position.

2. INSTALL

WATER

INLET

Install the water inlet with the two nuts.

Torque: 8.8 N

⋅

m (90 kgf

⋅

cm, 78 in.

⋅

lbf)

3.

FILL WITH ENGINE COOLANT (See page

CO–6

)

Capacity (w/ Heater):

M/T 8.5 liters (9.0 US qts, 7.5 Imp. qts)

A/T 8.4 liters (8.9 US qts, 7.4 Imp. qts)

4.

START ENGINE AND CHECK FOR LEAKS

–

COOLING SYSTEM

Thermostat

CO–11