Subaru Legacy IV (2008 year). Manual - part 288

CO(H4DOTC)-14

Engine Coolant

COOLING

3. Engine Coolant

A: REPLACEMENT

1. DRAINING OF ENGINE COOLANT

1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Remove the drain plug to drain engine coolant
into container.

NOTE:
Remove the coolant filler tank cap so that engine
coolant will drain faster.

5) Install the drain plug.
6) Install the under cover.

2. FILLING OF ENGINE COOLANT

1) Pour cooling system conditioner through the fill-
er neck.

Cooling system protective agent:

Refer to “SPECIFICATION” for the cooling 
system protective agent. <Ref. to 
CO(H4DOTC)-2, SPECIFICATION, General 
Description.>

2) Fill the engine coolant into coolant filler tank up
to the filler neck position.

Recommended engine coolant:

Refer to “SPECIFICATION” for the recom-
mended engine coolant. <Ref. to 
CO(H4DOTC)-2, SPECIFICATION, General 
Description.>

Coolant level:

Refer to “SPECIFICATION” for the amount of 
engine coolant. <Ref. to CO(H4DOTC)-2, 
SPECIFICATION, General Description.>

Engine coolant concentration:

Refer to “ADJUSTMENT” for the engine cool-
ant concentration. <Ref. to CO(H4DOTC)-15, 
ADJUSTMENT, Engine Coolant.>

CAUTION:
Do not confuse the cap of coolant filler tank and
cap of radiator.

NOTE:
• When pouring the engine coolant, the radiator
side cap must not be removed.
• The SUBARU Super Coolant containing anti-
freeze and anti-rust agents is especially made for
SUBARU engine, which has an aluminum cylinder
block. Always use SUBARU Super Coolant, since
other coolant may cause corrosion.
3) Fill engine coolant into the reservoir tank up to
“FULL” level.

4) Close the coolant filler tank cap, and start the en-
gine. Race 5 to 6 times at 3,000 rpm or less, then
stop the engine. (Complete this operation within 40
seconds.)
5) Wait for one minute after the engine stops, then
open the coolant filler tank cap. If the engine cool-
ant level drops, add engine coolant into the coolant
filler tank up to the filler neck position.
6) Perform the procedures 4) and 5) again.
7) Install the coolant filler tank cap and reservoir
tank cap properly.
8) Start the engine and operate the heater at max-
imum hot position and the blower speed setting to
“LO”.
9) Run the engine at 2,000 rpm or less until radiator
fan starts and stops.

NOTE:
Be careful with the engine coolant temperature
gauge to prevent overheating.
10) Stop the engine and wait until the engine cool-
ant temperature lowers to 30°C (86°F) or less.
11) Open the coolant filler tank cap. If the engine
coolant level drops, add engine coolant into the
coolant filler tank up to the filler neck position and
into the reservoir tank up to the “FULL” level.
12) Install the coolant filler tank cap and reservoir
tank cap properly.
13) Set the heater setting to maximum hot position
and the blower speed setting to “LO” and start the
engine. Perform racing at 3,000 rpm or less. If the
flowing sound is heard from heater core, repeat the
procedures from step 9).

CO-00248

CO-02492

FULL

LOW

CO(H4DOTC)-15

Engine Coolant

COOLING

B: ADJUSTMENT

1. PROCEDURE TO ADJUST THE SUBARU SUPER COOLANT CONCENTRATION

CAUTION:
SUBARU Super Coolant concentration must be used from 50 to 60% to assure the best performance
of the anti-freeze and anti-rust agents.
To adjust the concentration of SUBARU Super Coolant according to temperature, find the proper SUBARU
Super Coolant concentration in the table, and add diluting water to the SUBARU Super Coolant (concentrat-
ed type) until it reaches the proper dilution.

Recommended engine coolant and water for dilution:

Refer to “SPECIFICATION” for the recommended engine coolant and diluting water. <Ref. to 
CO(H4DOTC)-2, SPECIFICATION, General Description.>

Relationship of SUBARU Super Coolant concentration and freezing temperature

SUBARU Super Coolant concentration

50%

55%

60%

Freezing temperature

–36°C (–33°F)

–41°C (–42°F)

–50°C (–58°F)

CO(H4DOTC)-16

Water Pump

COOLING

4. Water Pump

A: REMOVAL

1) Remove the collector cover.
2) Remove the radiator. <Ref. to CO(H4DOTC)-20,
REMOVAL, Radiator.>
3) Remove the V-belts. <Ref. to ME(H4DOTC)-41,
REMOVAL, V-belt.>
4) Remove the crank pulley. 
<Ref. to ME(H4DOTC)-44, REMOVAL, Crank Pul-
ley.>
5) Remove the timing belt cover. <Ref. to
ME(H4DOTC)-46, REMOVAL, Timing Belt Cover.>
6) Remove the timing belt. <Ref. to ME(H4DOTC)-
47, REMOVAL, Timing Belt.>
7) Remove the automatic belt tension adjuster (A).
8) Remove the belt idler (B).
9) Remove the belt idler No. 2 (C).

10) Remove the cam sprocket LH. <Ref. to
ME(H4DOTC)-56, REMOVAL, Cam Sprocket.>
11) Remove the belt cover No. 2 LH.

12) Remove the tensioner bracket.

13) Disconnect the hose from water pump.

14) Remove the water pump.

B: INSTALLATION

1) Install the water pump onto cylinder block LH.

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

Tightening torque:

First:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

Second:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

2) Install the hose to water pump.
3) Install the tensioner bracket.

Tightening torque:

24.5 N·m (2.5 kgf-m, 18.1 ft-lb)

CO-00023

( A )

( B )

( C )

CO-00024

CO-00025

CO-00021

ME-02463

(F)

(E)

(D)

(C)

(B)

(A)

CO-00025

CO(H4DOTC)-17

Water Pump

COOLING

4) Install the belt cover No. 2 LH.

Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

5) Install the cam sprocket LH. <Ref. to
ME(H4DOTC)-56, INSTALLATION, Cam Sprock-
et.>
6) Install the belt idler No. 2 (C).

Tightening torque:

39 N·m (4.0 kgf-m, 28.8 ft-lb)

7) Install the belt idler (B).

Tightening torque:

25 N·m (2.5 kgf-m, 18.4 ft-lb)

8) Install an automatic belt tension adjuster (A) with
the tension rod held by a pin. <Ref. to
ME(H4DOTC)-49, AUTOMATIC BELT TENSION
ADJUSTER ASSEMBLY AND BELT IDLER, IN-
STALLATION, Timing Belt.>

9) Install the timing belt. <Ref. to ME(H4DOTC)-50,
TIMING BELT, INSTALLATION, Timing Belt.>
10) Install the timing belt cover. <Ref. to
ME(H4DOTC)-46, INSTALLATION, Timing Belt
Cover.>
11) Install the crank pulley. <Ref. to ME(H4DOTC)-
44, INSTALLATION, Crank Pulley.>
12) Install the V-belts. <Ref. to ME(H4DOTC)-42,
INSTALLATION, V-belt.>
13) Install the radiator. <Ref. to CO(H4DOTC)-21,
INSTALLATION, Radiator.>
14) 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 abnormally de-
formed or damaged.
4) Inspect the clearance between impeller and
pump case.

Clearance between impeller and pump case:

Standard

0.5 — 1.5 mm (0.020 — 0.059 in)

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

CO-00024

CO-00023

( A )

( B )

( C )

CO-00293