Subaru Legacy III (2000-2003 year). Manual - part 78

CO(H4SO)-20

COOLING

WATER PUMP

C: INSPECTION

1) Check water pump bearing for smooth rotation.
2) Check water pump pulley for abnormalities.
3) Using a dial gauge, measure impeller runout in
thrust direction while rotating the pulley.

“Thrust” runout limit:

0.5 mm (0.020 in)

4) Check clearance between impeller and pump
case.

Clearance between impeller and pump case:

Standard

0.5 — 0.7 mm (0.020 — 0.028 in)

Limit

1.0 mm (0.039 in)

5) After water pump installation, check pulley shaft
for engine coolant leaks. If leaks are noted, replace
water pump assembly.

CO-00028

CO-00029

CO(H4SO)-21

COOLING

THERMOSTAT

6. Thermostat

A: REMOVAL

1) Lift-up the vehicle.
2) Remove under cover.

3) Drain engine coolant completely. <Ref. to
CO(H4SO)-14, DRAINING OF ENGINE COOL-
ANT, REPLACEMENT, Engine Coolant.>
4) Disconnect radiator outlet hose from thermostat
cover.

5) Remove thermostat cover and gasket, and pull
out the thermostat.

B: INSTALLATION

1) Install the thermostat in the water pump, and in-
stall the thermostat cover together with a gasket.

NOTE:
• Replace gasket with a new one.
• Thermostat must be installed with jiggle pin (A)
facing the front side.

Tightening torque:

6.5 N·m (0.66 kgf-m, 4.8 ft-lb)

2) Fill coolant. <Ref. to CO(H4SO)-14, FILLING OF
ENGINE COOLANT, REPLACEMENT, Engine
Coolant.>

C: INSPECTION

Replace the thermostat if the valve does not close
completely at an ambient temperature or if the fol-
lowing test shows unsatisfactory results.
Immerse the thermostat and a thermometer in wa-
ter. Raise water temperature gradually, and mea-
sure the temperature and valve lift when the valve
begins to open and when the valve is fully opened.
During the test, agitate the water for even temper-
ature distribution. If the measured temperature is
within the specified range, the condition of thermo-
stat is normal.

LU-00095

CO-00105

CO-00031

CO-00032

( A )

CO(H4SO)-22

COOLING

THERMOSTAT

Specified value:

Starts to open:

With OBD: 80 — 84

°°°°

C (176 — 183

°°°°

F)

Without OBD: 76.0 — 80.0

°°°°

C (169 — 176

°°°°

F)

Fully opens:

With OBD: 95

°°°°

C (203

°°°°

F)

Without OBD: 91

°°°°

C (196

°°°°

F)

(A) Thermometer

(B) Thermostat

CO-00033

( A )

( B )

CO(H4SO)-23

COOLING

RADIATOR

7. Radiator

A: REMOVAL

1) Disconnect battery ground cable.

2) Lift-up the vehicle.
3) Remove under cover.

4) Drain engine coolant completely. <Ref. to
CO(H4SO)-14, DRAINING OF ENGINE COOL-
ANT, REPLACEMENT, Engine Coolant.>
5) Disconnect connectors of radiator main fan (A)
and sub fan (B) motor.

6) Disconnect radiator outlet hose from thermostat
cover.

7) Disconnect ATF cooler hoses from radiator. (AT
vehicles only)

8) Lower the vehicle.
9) Remove air intake duct.

10) Disconnect overflow hose.

FU-00009

LU-00095

( A )

( B )

CO-00084

(A) Clip

CO-00105

CO-00088

( A )

IN-00059

CO-00086