Subaru Impreza 2002 Service Manual page 947

MECHANICAL
4. INTAKE AND EXHAUST VALVE
1) Inspect the flange and stem of valve, and re-
place if damaged, worn, or deformed, or if "H" is
less than the specified limit.
H:
Intake
Standard 1.0 mm (0.039 in)
Limit 0.6 mm (0.024 in)
Exhaust
Standard 1.2 mm (0.047 in)
Limit 0.6 mm (0.024 in)
Valve overall length:
Intake
120.6 mm (4.75 in)
Exhaust
121.7 mm (4.79 in)
2) Put a small amount of grinding compound on the
seat surface and lap the valve and seat surface.
<Ref. to ME-67, VALVE SEAT, ADJUSTMENT,
Cylinder Head Assembly.> Install a new intake
valve oil seal after lapping.
CYLINDER HEAD ASSEMBLY
G2M0153
ME-70