Subaru IMPREZA 2002 Service Manual page 165

CYLINDER HEAD ASSEMBLY
MECHANICAL
( 5 ) Put a new valve guide, coated with sufficient
oil, in cylinder, and insert the ST1 into valve
guide. Press in until the valve guide upper end is
flush with the upper surface of ST2.
STI 499767200 VALVE GUIDE REMOVER
Intake side:
ST2 499767700 VALVE GUIDE ADJUSTER
Exhaust side:
ST2 499767800 VALVE GUIDE ADJUSTER
(6) Check the valve guide protrusion.
Intake
Exhaust
Valve guide protrusion: L
20.0
-
20.5 mm (0.787
-
0.807 in)
16.5
-
77.0 mm (0.650
-
0.669 in)
(7) Ream the inside of valve guide with ST.
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.
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 chip,
use a new reamer or remedy the reamer.
ST 499767400 VALVE GUIDE REAMER
(8) Recheck the contact condition between
valve and valve seat after replacing the valve
guide.
(A) Valve guide
ME( S0HC)-67