Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 17

PM-6

Engine Oil

PERIODIC MAINTENANCE SERVICES

6) After turning off the engine, wait a few minutes

for the oil to return to the oil pan before checking

the level.
NOTE:

• Just after driving or while the engine is warm, en-

gine oil level shows in the range between the “F”

line and the notch mark. This is caused by thermal

expansion of engine oil.

• As the oil level gauge is used for daily mainte-

nance, the “F” and “L” lines are set assuming that

the engine is cold.

7) To prevent overfilling the engine oil, do not add

oil above the “F” line when the engine is cold.

(A) Oil level gauge
(B) Oil filler cap

(C) “F” line
(D) “L” line

(E) Approx. 1 L (1.1 US qt, 0.9 Imp qt)

(F) Notch mark

(C)

(B)

(D)

(E)

(F)

(A)

PI-00460

PM-7

Engine Oil Filter

PERIODIC MAINTENANCE SERVICES

4. Engine Oil Filter

A: REPLACEMENT

1) Lift up the vehicle.

2) Remove the under cover.

3) Remove the oil filter using ST.

• Oil filter (black)

ST 18332AA000 OIL FILTER WRENCH (OUT-

ER DIAMETER: 68 MM (2.68

IN) FOR OIL FILTER)

• Oil filter (blue)

General tool

Oil filter wrench (65/67 mm 14

Flutes)

CAUTION:

If any engine oil is spilled on the exhaust pipe,

under cover, wipe off completely to prevent

fires or emission of smoke.

4) Clean the oil filter installation surface of the oil

cooler.

5) Obtain a new engine oil filter and apply a thin

coat of engine oil to the seal rubber.

6) Install the oil filter by turning it by hand, being

careful not to damage seal rubber.

• Tighten the oil filter (black) 68 mm (2.68 in) in di-

ameter (approx. one rotation) after the seal rubber

of the oil filter comes in contact with the oil cooler.

When using a torque wrench, tighten to 14 N·m (1.4

kgf-m, 10.3 ft-lb).

• Tighten the oil filter (blue) with an outer diameter

of 67.4 mm (2.65 in) (approx. 7/8 rotation) after the

seal rubber of the oil filter comes in contact with cyl-

inder block. When using a torque wrench, tighten to

12 N·m (1.2 kgf-m, 8.9 ft-lb).
CAUTION:

Do not tighten excessively. Excessive tighten-

ing may cause oil to leak.

7) Run the engine and make sure that no oil is leak-

ing around seal rubber.
NOTE:

The filter element and filter case are permanently

jointed; therefore, interior cleaning is not neces-

sary.

8) Check the engine oil level. <Ref. to PM-5, IN-

SPECTION, Engine Oil.>

PM-00419

PM-8

Spark Plug

PERIODIC MAINTENANCE SERVICES

5. Spark Plug

A: REPLACEMENT

1. RH SIDE

1) Disconnect the ground cable from battery.

2) Remove the air cleaner case. <Ref. to IN(STI)-8,

REMOVAL, Air Cleaner Case.> <Ref. to IN(w/o

STI)-8, REMOVAL, Air Cleaner Case.>

3) Disconnect the connector from ignition coil.

4) Remove the ignition coil.
NOTE:

Turn #3 ignition coil by 180° to remove it.

5) Remove the spark plug with a spark plug socket.

6) Install in the reverse order of removal.
Tightening torque (spark plug):

21 N·m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (ignition coil):

16 N·m (1.6 kgf-m, 11.8 ft-lb)

2. LH SIDE

1) Remove the battery. <Ref. to SC(STI)-27, RE-

MOVAL, Battery.>

2) Remove the secondary air pump. <Ref. to

EC(STI)-27, REMOVAL, Secondary Air Pump.>

<Ref. to EC(w/o STI)-29, REMOVAL, Secondary

Air Pump.>

3) Remove the bolts that secure the air duct to the

rocker cover (LH), and lift the air duct.

• STI model

• Except for STI model

4) Disconnect the connector from ignition coil.

IN-00203

IG-00092

IG-02072

IG-02067

PM-9

Spark Plug

PERIODIC MAINTENANCE SERVICES

5) Remove the ignition coil.
NOTE:

Turn #4 ignition coil by 180 degrees to remove it.

• STI model

• Except for STI model

6) Remove the spark plug with a spark plug socket.

7) Install in the reverse order of removal.
Tightening torque (Spark plug):

21 N·m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (Ignition coil):

16 N·m (1.6 kgf-m, 11.8 ft-lb)

Tightening torque (Air duct):

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

IG-02073

IG-02123