Subaru 2002 IMPREZA Service Manual page 175

CYLINDER HEAD ASSEMBLY
m
MECHANICAL
(5) Put a new valve guide, coated with sufficient
oil, in cylinder, and insert ST1 into valve guide.
Press in until the valve guide upper end is flush
with the upper surface of ST2.
ST1 499767200 VALVE GUIDE REMOVER
ST2 498267700 VALVE GUIDE ADJUSTER
S2M1883A
(6) Check the valve guide protrusion.
12.0
-
12.4 mm (0.472
-
0.488 in)
(7) Ream the inside of valve guide with
Valve guide protrusion: L
3T.
Gently rotate the reamer clockwise while press-
ing it lightly into the valve guide, and return it
also rotating clockwise. After reaming, clean the
valve guide to remove chips.
ST 499767400 VALVE GUIDE REAMER
CAUTION:
Apply engine oil to the reamer when reaming.
If the inner surface of the valve guide is torn,
the edge of the reamer should be slightly
ground with an oil stone.
If the inner surface of the valve guide be-
comes lustrous and the reamer does not chips,
use a new reamer or remedy the reamer.
(8) Recheck the contact condition between
valve and valve seat after replacing the valve
guide.
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
1.2 mm (0.047 in)
Limit
0.8 mm (0.031 in)
Exhaust
Standard
1.5 mm (0.059 in)
Limit
0.8 mm (0.031 in)
Valve overall length:
Intake
Exhaust
104.4 mm (4.110in)
104.7 mm (4.122 in)
G2M0153
2) Put a small amount of grinding compound on the
seat surface and lap the valve and seat surface.
Install a new intake valve
oil
seal after lapping.
ME(D0HC TURBO)-69