Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 19

PM-14

Fuel Line

PERIODIC MAINTENANCE SERVICES

8. Fuel Line

A: INSPECTION

For fuel line, check pipes, areas near pipes, and

engine compartment piping for rust, hose damage,

loose band, etc. If faulty parts are found, repair or

replace them. <Ref. to FU(STI)-93, Fuel Delivery,

Return and Evaporation Lines.> <Ref. to FU(w/o

STI)-89, Fuel Delivery, Return and Evaporation

Lines.>

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PM-15

Fuel Filter

PERIODIC MAINTENANCE SERVICES

9. Fuel Filter

A: REPLACEMENT

For fuel filter replacement procedure, refer to FU

section. <Ref. to FU(STI)-85, Fuel Filter.>

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PM-16

Air Cleaner Element

PERIODIC MAINTENANCE SERVICES

10.Air Cleaner Element

A: REPLACEMENT

1) Disconnect the ground cable from battery.

2) Remove the air intake duct. <Ref. to IN(STI)-10,

REMOVAL, Air Intake Duct.> <Ref. to IN(w/o STI)-

10, REMOVAL, Air Intake Duct.>

3) Disconnect the connector (A) from mass air flow

and intake air temperature sensor.

4) Remove the clip (B) from the air cleaner case.

5) Open the air cleaner case, and remove the air

cleaner element.

6) Install in the reverse order of removal.
CAUTION:

Be sure to use SUBARU genuine air cleaner el-

ement depending on the engine type when re-

placing the air cleaner elements. Using other air

cleaner element may affect the engine perfor-

mance.
NOTE:

• Check that there are no foreign objects in the air

cleaner case.

• When installing the air cleaner case (rear), align

the protrusion of the air cleaner case (rear) to the

hole on the air cleaner case (front) to install.

IN-00203

IN-02335

(A)

(B)

(B)

IN-02438

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PM-17

Cooling System

PERIODIC MAINTENANCE SERVICES

11.Cooling System

A: INSPECTION

1) To check the radiator for leakage, fill it with en-

gine coolant, and attach the radiator cap tester to

the filler neck, and apply pressure. Check the fol-

lowing points:

Pressure:

122 kPa (1.2 kgf/cm

2

, 18 psi)

• Each portion of radiator for leakage

• Hose joints and other connections for leakage
CAUTION:

• If any engine coolant is spilled on the exhaust

pipe or under cover, wipe off completely to pre-

vent fires or emission of smoke.

• Be careful not to deform the filler neck of filler

tank when installing and removing the tester,

and while operating the tester.
NOTE:

• Be sure to install the tester to filler tank side.

• STI model

• Except for STI model

• When performing this check, be sure to keep the

engine stationary and fill radiator with coolant.

• Wipe off check points before applying pressure.

• Use care not to spill coolant when detaching

tester from filler tank.

• Do not remove the radiator side cap.

2) Check the radiator cap valve open pressure us-

ing radiator cap tester.
NOTE:

Rust or dirt on the cap may prevent valve from func-

tioning normally. be sure to clean the cap before

testing.

Raise the pressure until the needle of gauge stops

and see if the pressure can be retained for five to

six seconds. The radiator cap is normal if a pres-

sure above the limit value has been maintained for

this period. Replace the radiator cap if the pressure

is below the limit.
Radiator cap valve open pressure
Filler tank side

Specification:

93 — 123 kPa (0.95 — 1.25 kgf/cm

2

, 14 — 18

psi)

Service limit:

83 kPa (0.85 kgf/cm

2

, 12 psi)

Radiator side

Specification:

122 — 152 kPa (1.24 — 1.55 kgf/cm

2

, 18 —

22 psi)

Service limit:

112 kPa (1.14 kgf/cm

2

, 16 psi)

3) Start the engine, and then inspect that it does

not overheat or it is not cooled excessively. If it

overheats or it is cooled excessively, check the

cooling system.

<Ref. to CO(STI)-15, Water Pump.> <Ref. to

CO(STI)-17, Thermostat.> <Ref. to CO(STI)-19,

Radiator.> <Ref. to CO(STI)-22, Radiator Cap.>

<Ref. to CO(w/o STI)-15, Water Pump.> <Ref. to

CO(w/o STI)-17, Thermostat.> <Ref. to CO(w/o

STI)-19, Radiator.>

CO-02408

CO-02244

PM-00023

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