Subaru Legacy 2003 Service Manual page 1712

(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.
ST 499767400 VALVE GUIDE REAMER
NOTE:
• 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 becomes
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)
CYLINDER HEAD ASSEMBLY
ME(H4DOSTC)-67
Valve overall length:
Intake
104.4 mm (4.110 in)
Exhaust
104.7 mm (4.122 in)
H
H
2) Put a small amount of grinding compound on the
seat surface and lap the valve and seat surface. In-
stall a new intake valve oil seal after lapping.
MECHANICAL
+1
90˚ -0
+1
90˚ -0
ME-00131