Subaru Impreza 2003 Service Manual page 244

MECHANICAL
8. Valve Clearance
A: INSPECTION
NOTE:
Inspection and adjustment of the valve clearance
should be performed while engine is cold.
1) Set the vehicle on a lift.
2) Lift-up the vehicle.
3) Remove the under cover.
4) Lower the vehicle.
5) Disconnect the ground cable from battery.
6) Remove the timing belt cover (LH).
7) When inspecting the #1 and #3 cylinders;
(1) Disconnect the spark plug cords from spark
plugs RH side. <Ref. to IG(H4SO)-5, RH SIDE,
REMOVAL, Spark Plug.>
(2) Disconnect the PCV hose from rocker cover
(RH).
(3) Remove the bolts, and then remove the
rocker cover (RH).
8) When inspecting the #2 and #4 cylinders;
(1) Disconnect the spark plug cords from spark
plugs (LH Side). <Ref. to IG(H4SO)-5, LH SIDE,
REMOVAL, Spark Plug.>
(2) Disconnect the PCV hose from rocker cover
(LH).
(3) Remove the bolts, and then remove the
rocker cover (LH).
VALVE CLEARANCE
9) Set the #1 cylinder piston to top dead center of
compression stroke by rotating crankshaft pulley
clockwise using a socket wrench.
NOTE:
When arrow mark (A) on the camshaft sprocket
(LH) comes exactly to the top, #1 cylinder piston is
brought to the top dead center of compression
stroke.
10) Measure the #1 cylinder valve clearance by us-
ing thickness gauge.
FU-00009
CAUTION:
• Insert the thickness gauge (A) in as horizon-
tal a direction as possible with respect to the
valve stem end face.
• Measure the exhaust valve clearances while
lifting up the vehicle.
Valve clearance:
Intake;
Exhaust;
ME-00199
11) If necessary, adjust the valve clearance. <Ref.
to ME(H4SO)-33, ADJUSTMENT, Valve Clear-
ance.>
ME(H4SO)-32
0.20 ± ± ± ± 0.02 mm (0.0079 ± ± ± ± 0.0008 in)
0.25 ± ± ± ± 0.02 mm (0.0098 ± ± ± ± 0.0008 in)
( A )
ME-00200
( A )
ME-00201