Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 186
CO(w/o STI)-13
Engine Coolant
COOLING
3. Engine Coolant
A: INSPECTION
NOTE:
When adding the engine coolant, always use SUB-
ARU Super Coolant.
1) Park the vehicle on a level surface.
2) Check the engine coolant amount, and if the
coolant level is low, check for the coolant leakage,
and then add the engine coolant.
(1) Make sure the engine coolant level in the
reservoir tank is between “FULL” and “LOW”
with the engine in a cold condition.
(2) Open the cap of coolant filler tank, and
check that the engine coolant is filled up to the
filler neck position.
B: REPLACEMENT
1. DRAINING OF ENGINE COOLANT
1) Lift up the vehicle.
2) Remove the under cover. <Ref. to EI-28, RE-
3) Remove the drain plug to drain engine coolant
into container.
NOTE:
Remove the coolant filler tank cap so that engine
coolant will drain faster.
4) Install the drain plug.
NOTE:
Use new O-rings.
5) Install the under cover. <Ref. to EI-28, INSTAL-
2. FILLING OF ENGINE COOLANT
1) Pour cooling system conditioner through the fill-
er neck of coolant filler tank.
Cooling system protective agent:
Refer to “SPECIFICATION” for cooling sys-
tem protective agent. <Ref. to CO(w/o STI)-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 recommended
engine coolant. <Ref. to CO(w/o STI)-2,
SPECIFICATION, General Description.>
Engine coolant level:
Refer to “SPECIFICATION” for engine cool-
ant level. <Ref. to CO(w/o STI)-2, SPECIFICA-
Engine coolant concentration:
Refer to “ADJUSTMENT” for the recommend-
ed engine coolant concentration. <Ref. to
CO(w/o STI)-14, ADJUSTMENT, Engine Cool-
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 contains anti-
freeze and anti-rust agents, and is especially made
for Subaru engines with an aluminum cylinder
block. Be sure to use SUBARU Super Coolant,
since other coolant may cause corrosion.
3) Fill engine coolant into the reservoir tank up to
“FULL” level.
CO-02501
CO-02764
FULL
LOW
CO(w/o STI)-14
Engine Coolant
COOLING
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 coolant fill-
er 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 3,000 rpm or less until radiator
fan starts and stops.
NOTE:
Be careful with the engine coolant temperature 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
the reservoir tank to “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 the heater core, repeat
the procedures from step 9).
C: ADJUSTMENT
1. PROCEDURE TO ADJUST THE SUBARU SUPER COOLANT CONCENTRATION
CAUTION:
Use the SUBARU Super Coolant with a 50 — 60% concentration in order to obtain maximum anti-
freeze and anti-rust performance.
To adjust the concentration of SUBARU Super Coolant according to temperature, find the proper SUBARU
Super Coolant concentration in the table, and add dilution water to the SUBARU Super Coolant (concentrat-
ed type) until it reaches the proper dilution.
Engine coolant and diluting water:
Refer to “SPECIFICATION” for recommended engine coolant and diluting water. <Ref. to CO(w/o
STI)-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(w/o STI)-15
Water Pump
COOLING
4. Water Pump
A: REMOVAL
1) Remove the radiator. <Ref. to CO(w/o STI)-19,
2) Remove the V-belts. <Ref. to ME(w/o STI)-38,
3) Remove the crank pulley. <Ref. to ME(w/o STI)-
4) Remove the timing belt cover. <Ref. to ME(w/o
STI)-47, REMOVAL, Timing Belt Cover.>
5) Remove the timing belt. <Ref. to ME(w/o STI)-
6) Remove the automatic belt tension adjuster (A).
7) Remove the belt idler (B).
8) Remove the belt idler No. 2 (C).
9) Remove the cam sprocket LH. <Ref. to ME(w/o
STI)-57, REMOVAL, Cam Sprocket.>
10) Remove the belt cover No. 2 LH.
11) Remove the tensioner bracket.
12) Disconnect the hose from water pump.
13) 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-02726
(A)
(B)
(C)
CO-02908
ME-04984
CO-00021
ME-04743
(F)
(C)
(A)
(E)
(D)
(B)
ME-04984
CO(w/o STI)-16
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(w/o
STI)-57, INSTALLATION, Cam Sprocket.>
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 the automatic belt tension adjuster (A)
with the tension rod held by a pin. <Ref. to ME(w/o
STI)-50, AUTOMATIC BELT TENSION ADJUST-
ER ASSEMBLY AND BELT IDLER, INSTALLA-
9) Install the timing belt. <Ref. to ME(w/o STI)-51,
TIMING BELT, INSTALLATION, Timing Belt.>
10) Install the timing belt cover. <Ref. to ME(w/o
STI)-47, INSTALLATION, Timing Belt Cover.>
11) Install the crank pulley. <Ref. to ME(w/o STI)-
45, INSTALLATION, Crank Pulley.>
12) Install the V-belts. <Ref. to ME(w/o STI)-38, IN-
13) Install the radiator. <Ref. to CO(w/o STI)-20,
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-02908
CO-02726
(A)
(B)
(C)
CO-00293
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