Subaru Legacy (2005 year). Manual - part 296

CO(H4DOTC)-15

COOLING

Water Pump

4. Water Pump

A: REMOVAL

1) Remove the collector cover.
2) Remove the radiator. <Ref. to CO(H4DOTC)-19,
REMOVAL, Radiator.>
3) Remove the V-belts.

 

<Ref. to ME(H4DOTC)-40,

REMOVAL, V-belt.>
4) Remove the timing belt.

 

<Ref. to ME(H4DOTC)-

46, REMOVAL, Timing Belt.>
5) Remove the automatic belt tension adjuster (A).
6) Remove the belt idler (B).
7) Remove the belt idler No. 2 (C).

8) Remove the camshaft position sensor. <Ref. to
FU(H4DOTC)-24, REMOVAL, Camshaft Position
Sensor.>
9) Remove the cam sprocket (LH) using ST.

 

<Ref.

to ME(H4DOTC)-54, REMOVAL, Cam Sprocket.>
10) Remove the tensioner bracket.

11) Remove the belt cover No. 2 (LH).

12) Disconnect the hose from water pump.

13) Remove the water pump.

B: INSTALLATION

1) Install the water pump onto cylinder block (LH).

NOTE:
• Always use new gasket.
• When installing the water pump, tighten the bolts
in two stages in alphabetical sequence as shown in
the figure.

Tightening torque:

1st

12 N

⋅

m (1.2 kgf-m, 8.9 ft-lb)

2nd

12 N

⋅

m (1.2 kgf-m, 8.9 ft-lb)

2) Connect the hose to water pump.
3) Install the belt cover No. 2 (LH).

Tightening torque:

5.0 N

⋅

m (0.5 kgf-m, 3.7 ft-lb)

4) Install the tensioner bracket.

CO-00023

( A )

( B )

( C )

CO-00025

CO-00024

CO-00021

ME-02463

(F)

(E)

(D)

(C)

(B)

(A)

CO-00024

CO(H4DOTC)-16

COOLING

Water Pump

Tightening torque:

24.5 N

⋅

m (2.5 kgf-m, 18.1 ft-lb)

5) Install the cam sprocket (LH) using ST.

 

<Ref. to

ME(H4DOTC)-54, INSTALLATION, Cam Sprock-
et.>
6) Install the camshaft position sensor. <Ref. to
FU(H4DOTC)-24, INSTALLATION, Camshaft Po-
sition Sensor.>
7) Install the belt idler No. 2 (C).
8) Install the belt idler (B).
9) Install the automatic belt tension adjuster (A)
which has a tension rod held by a pin.

 

<Ref. to

ME(H4DOTC)-48, AUTOMATIC BELT TENSION
ADJUSTER ASSEMBLY AND BELT IDLER, IN-
STALLATION, Timing Belt.>

Tightening torque:

39 N

⋅

m (4.0 kgf-m, 28.9 ft-lb)

10) Install the timing belt.

 

<Ref. to ME(H4DOTC)-

49, TIMING BELT, INSTALLATION, Timing Belt.>
11) Install the V-belts.

 

<Ref. to ME(H4DOTC)-40,

INSTALLATION, V-belt.>
12) Install the radiator. <Ref. to CO(H4DOTC)-20,
INSTALLATION, Radiator.>
13) Install the collector cover.

C: INSPECTION

1) Check the water pump bearing for smooth rota-
tion.
2) Check the water pump pulley for abnormalities.
3) Make sure the impeller is not deformed or dam-
aged.
4) Inspect the clearance between impeller and
pump case.

Clearance between impeller and pump case:

Specification

0.5 — 1.5 mm (0.020 — 0.059 in)

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

CO-00025

CO-00023

( A )

( B )

( C )

CO-00293

CO(H4DOTC)-17

COOLING

Thermostat

5. Thermostat

A: REMOVAL

1) Set the vehicle on a lift.
2) Lift-up the vehicle.
3) Remove the under cover.
4) Drain engine coolant completely.
<Ref. to CO(H4DOTC)-13, DRAINING OF EN-
GINE COOLANT, REPLACEMENT, Engine Cool-
ant.>

5) Disconnect the radiator outlet hose from thermo-
stat cover.

6) Remove the thermostat cover, and then remove
the gasket and thermostat.

B: INSTALLATION

1) Install a gasket to thermostat, and install the
thermostat and gasket to water pump as a unit.
Then, install the thermostat cover.

NOTE:
• When reinstalling the thermostat, use a new gas-
ket.
• The thermostat must be installed with the jiggle
pin facing upward.

CO-00248

CO-00249

(A) Thermostat cover

(B) Gasket

(C) Thermostat

CO-00154

(A)

(C)

(B)

CO(H4DOTC)-18

COOLING

Thermostat

Tightening torque:

12 N

⋅

m (1.2 kgf-m, 8.9 ft-lb)

2) Connect the radiator outlet hose to thermostat
cover.
3) Install the under cover.
4) Lower the vehicle.
5) Fill with engine coolant. <Ref. to CO(H4DOTC)-
13, FILLING OF ENGINE COOLANT, REPLACE-
MENT, 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.
• Inspection method
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. The measured value should
meet the specification.

NOTE:
• Leave the thermostat in the boiling water for
more than five minutes before measuring valve lift.
• Hold the thermostat with a wire or the like to
avoid contacting with container bottom.

Starting temperature to open:

76 — 80

°

C (169 — 176

°

F)

Fully opens:

91

°

C (196

°

F)

Valve lift:

9.0 mm (0.354 in) or more

(A) Thermostat cover

(B) Gasket

(C) Thermostat

(D) Jiggle pin

CO-02153

(A)

T 

(B)

(C)

(D)

(A) Thermometer

(B) Thermostat

CO-00033

( A )

( B )