Subaru Impreza 2002 Service Manual page 909

MECHANICAL
B: ADJUSTMENT
CAUTION:
Adjustment of the valve clearance should be
performed while engine is cold.
1) Set the #1 cylinder piston to top dead center of
compression stroke by rotating crankshaft pulley
clockwise using ST.
ST 499977300 CRANK PULLEY WRENCH
(1600 cc and 2000 cc model)
ST 499977100 CRANK PULLEY WRENCH
(2500 cc model)
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.
VALVE CLEARANCE
2) Adjust the #1 cylinder valve clearance.
(1) Loosen the valve rocker nut and screw.
(2) Place suitable thickness gauge.
(3) While noting the valve clearance, tighten the
valve rocker adjust screw.
(4) When specified valve clearance is obtained,
tighten the valve rocker nut.
Tightening torque:
10 N·m (1.0 kgf-m, 7.2 ft-lb)
CAUTION:
• Insert the thickness gauge in as horizontal a
direction as possible with respect to the valve
stem end face.
• Adjust the exhaust valve clearances while
lifting up the vehicle.
Valve clearance:
Intake;
Exhaust;
B2M2027B
3) Ensure the valve clearances are within specifi-
cations.
4) Turn the crankshaft two complete rotations until
#1 cylinder piston is again set to the top dead cen-
ter on compression stroke.
5) Ensure the valve clearances are within specifi-
cations. If necessary, readjust the valve clearanc-
es.
ME-32
0.20 ± ± ± ± 0.02 mm (0.0079 ± ± ± ± 0.0008 in)
0.25 ± ± ± ± 0.02 mm (0.0098 ± ± ± ± 0.0008 in)
B2M2030