Lexus SC300 / Lexus SC400. Manual — part 699

(b) Remove the two bolts holding the water inlet housing to

the water pump.

(c) Pull out the water inlet and inlet housing assembly.
(d) Remove the O–ring from the water inlet housing.

4. REMOVE

WATER

PUMP

(a) Remove the five mounting bolts, two stud bolts and nut.

(b) Remove the water pump by prying the portions between

the water pump and cylinder block with a screwdriver.

(c) Remove the O–ring from the water by–pass pipe.

INSPECTION OF WATER PUMP

INSPECT WATER PUMP

Turn the pulley and check that the water pump bearing
moves smoothly and quietly.

–

COOLIING SYSTEM

Water Pump

CO–9

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: Removal of the thermostat would have an adverse ef-
fect, causing a lowering of cooling efficiency. Do not remove
the thermostat, even if the tends to overheat.

COMPONENTS FOR REMOVAL AND
INSTALLATION

REMOVAL OF THERMOSTAT

1.

DRAIN ENGINE COOLANT (See page

CO–6

)

2. REMOVE

THERMOSTAT

(a) Remove the two nuts holding the water inlet to the inlet

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

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

CO–12

–

COOLIING SYSTEM

Thermostat