Subaru Legacy III (2000-2003 year). Manual - part 441

CO(H4DOSTC)-18

COOLING

WATER PUMP

15) Remove V-belts.
<Ref. to ME(H4DOSTC)-42, REMOVAL, V-belt.>
16) Remove timing belt.
<Ref. to ME(H4DOSTC)-47, REMOVAL, Timing
Belt Assembly.>
17) Remove automatic belt tension adjuster.
18) Remove belt idler (B).
19) Remove belt idler No. 2 (C).

20) Remove camshaft position sensor. <Ref. to
FU(H4DOSTC)-30, REMOVAL, Camshaft Position
Sensor.>
21) Remove left-hand camshaft sprocket by using
ST.
ST

18231AA010

CAMSHAFT SPROCKET 
WRENCH (Intake side)

ST

499207400

CAMSHAFT SPROCKET 
WRENCH (Exhaust side)

22) Remove tensioner bracket.

23) Remove left-hand belt cover No. 2.

24) Remove water pump.

B: INSTALLATION

1) Install water pump onto left-hand cylinder block.

NOTE:
• Replace gasket with a new one.
• When installing water pump, tighten bolts in two
stages in alphabetical sequence as shown in fig-
ure.

Tightening torque:

First:

12 N·m (1.2 kgf-m, 8.7 ft-lb)

Second:

12 N·m (1.2 kgf-m, 8.7 ft-lb)

( A )

( B )

( C )

CO-00149

CO-00150

ST

CO-00020

CO-00151

CO-00021

( A )

( B )

( C )

( D )

( E )

( F )

CO-00152

CO(H4DOSTC)-19

COOLING

WATER PUMP

2) Install tensioner bracket.

Tightening torque:

25 N·m (2.5 kgf-m, 18.1 ft-lb)

3) Install left-hand belt cover No. 2.

Tightening torque:

5 N·m (0.5 kgf-m, 3.6 ft-lb)

4) Install left-hand camshaft sprockets by using ST.
ST

18231AA010

CAMSHAFT SPROCKET 
WRENCH (Intake side)

ST

499207400

CAMSHAFT SPROCKET 
WRENCH (Exhaust side)

5) Install camshaft position sensor. <Ref. to
FU(H4DOSTC)-30, INSTALLATION, Camshaft
Position Sensor.>

Tightening torque:

98 N·m (10.0 kgf-m, 72.3 ft-lb)

6) Install belt idler No. 2 (C).
7) Install belt idler (B).

Tightening torque:

39 N·m (4.0 kgf-m, 28.9 ft-lb)

8) Install automatic belt tension adjuster which ten-
sion rod is held with pin.  <Ref. to ME(H4DOSTC)-
49, BELT IDLER AND AUTOMATIC BELT TEN-
SION ADJUSTER ASSEMBLY, INSTALLATION,
Timing Belt Assembly.>

9) Install timing belt. <Ref. to ME(H4DOSTC)-49,
INSTALLATION, Timing Belt Assembly.>
10) Install V-belts.  <Ref. to ME(H4DOSTC)-42, IN-
STALLATION, V-belt.>
11) Install radiator main fan and sub fan motor as-
semblies. <Ref. to CO(H4DOSTC)-28, INSTALLA-
TION, Radiator Main Fan and Fan Motor.>  and
<Ref. to CO(H4DOSTC)-30, INSTALLATION, Ra-
diator Sub Fan and Fan Motor.>
12) Install reservoir tank.

13) Connect overflow hose.

14) Install air intake duct.
15) Lift-up the vehicle.
16) Connect radiator outlet hose (A) and heater by-
pass hose (B) to water pump.

CO-00020

CO-00151

CO-00150

ST

( A )

( B )

( C )

CO-00149

CO-00087

CO-00086

CO(H4DOSTC)-20

COOLING

WATER PUMP

17) Connect water by-pass hose (C) and oil cooler
hose (D).

18) Install water by-pass pipe, and then install bolt
and clamps. (MT model)

19) Connect connectors to radiator main fan (A)
and sub fan (B) motors.

20) Install radiator under cover.
21) Install under cover.
22) Lower the vehicle.
23) Connect battery ground cable.

24) Fill coolant. <Ref. to CO(H4DOSTC)-15, FILL-
ING OF ENGINE COOLANT, REPLACEMENT,
Engine Coolant.>

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.

( A )

( B )

( C )

( D )

CO-00148

CO-00147

( A )

( B )

CO-00084

FU-00009

CO-00028

CO-00029

CO(H4DOSTC)-21

COOLING

THERMOSTAT

6. Thermostat

A: REMOVAL

1) Lift-up the vehicle.
2) Remove under cover.
3) Drain engine coolant completely. <Ref. to
CO(H4DOSTC)-15, DRAINING LOF ENGINE
COOLANT, 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 fac-
ing the front side.

Tightening torque:

6.4 N·m (0.65 kgf-m, 4.7 ft-lb)

2) Fill coolant. <Ref. to CO(H4DOSTC)-15, FILL-
ING OF ENGINE COOLANT, REPLACEMENT,
Engine Coolant.>

(A) Thermostat cover

(B) Gasket 

(C) Thermostat

CO-00153

CO-00154

(A)

(C)

(B)

(A) Thermostat cover

(B) Gasket 

(C) Thermostat

(D) Jiggle pin

CO-00155

(A)

T 

(B)

(C)

(D)