Lexus RX300 (MCU15). Service manual - part 185

CO07Z–03

P12942

–

COOLING

WATER PUMP

CO–9

LEXUS RX300   (RM785E)

INSTALLATION

1.

INSTALL WATER PUMP

Install a new gasket and the water pump with the 4 bolts and 2
nuts.

Torque: 8 N·m (80 kgf·cm, 69 in.·lbf)

NOTICE:
Do not get oil on the gasket.
2.

INSTALL NO.3 TIMING BELT COVER
(See page EM–60)

3.

INSTALL NO.2 IDLER PULLEY
(See page EM–22)

4.

INSTALL CAMSHAFT TIMING PULLEYS
(See page EM–22)

5.

INSTALL TIMING BELT
(See page EM–22)

6.

INSTALL FRONT UPPER SUSPENSION BRACE
(See page EM–82)

7.

INSTALL OUTER COWL TOP PANEL
(See page EM–82)

8.

FILL WITH ENGINE COOLANT

9.

START ENGINE AND CHECK FOR LEAKS

10.

RECHECK ENGINE COOLANT LEVEL

CO080–03

B12313

Air Flow Meter 
Connector

EVAP Hose

Air Cleaner Cap

Engine Wire Protector

No.2 Water Temperature 
Switch Connector

Thermostat

z Gasket

Water Inlet Pipe

Water Inlet

N·m (kgf·cm, ft·lbf)

z Non–reusable part

: Specified torque

z O–Ring

19.5 (200, 14)

8 (80, 69 in.·lbf)

Air Filter

V–Bank Cover

Air Cleaner Case

CO–10

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COOLING

THERMOSTAT

LEXUS RX300   (RM785E)

THERMOSTAT

COMPONENTS

CO081–03

B04152

B04151

B04150

–

COOLING

THERMOSTAT

CO–11

LEXUS RX300   (RM785E)

REMOVAL

HINT:
Removal of the thermostat would have an adverse effect, caus-
ing a lowering of cooling efficiency. Do not remove the thermo-
stat, even if the engine tends to overheat.
1.

DRAIN ENGINE COOLANT

2.

REMOVE AIR CLEANER CAP AND AIR CLEANER
CASE

3.

DISCONNECT NO.2 WATER TEMPERATURE SWITCH
CONNECTOR

4.

DISCONNECT ENGINE WIRE PROTECTOR FROM
WATER INLET AND RH CYLINDER HEAD

Remove the nut and disconnect the clamp, and disconnect the
engine wire protector from the water inlet and cylinder head.

5.

DISCONNECT WATER INLET PIPE FROM WATER
INLET AND LH CYLINDER HEAD

(a)

Remove the bolt, and disconnect the inlet pipe from the
water inlet.

(b)

Remove the O–ring from the inlet pipe.

6.

REMOVE WATER INLET AND THERMOSTAT

(a)

Remove the 3 nuts, water inlet and thermostat.

(b)

Remove the gasket from the thermostat.

CO082–02

P13255

CO0601

Z10579

10 mm

CO–12

–

COOLING

THERMOSTAT

LEXUS RX300   (RM785E)

INSPECTION

INSPECT THERMOSTAT
HINT:
The thermostat is numbered with the valve opening tempera-
ture.

(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: 10.0 mm (0.394 in.) or more at 95

°C (203°F)

If the valve lift is not as specified, replace the thermostat.
(d)

Check that the valve is fully closed when the thermostat
is at low temperatures (below 40

°C (104°F)).

If not closed, replace the thermostat.