Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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-
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-
2) Remove the secondary air pump. <Ref. to
EC(STI)-27, REMOVAL, Secondary Air Pump.>
<Ref. to EC(w/o STI)-29, REMOVAL, Secondary
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
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