Subaru 2009 IMPREZA Service Manual page 1133

6. INTAKE AND EXHAUST VALVE OIL SEAL
1) For the following, replace the oil seal with a new
part. See the procedure 2) and subsequent for re-
placement procedures.
• When the lip is damaged.
• When the spring is out of the specified position.
• When readjusting the surfaces of valve and
valve seat.
• When replacing the valve guide.
2) Place the cylinder head on ST1, and use ST2 to
press-fit the oil seal.
ST1 498267600 CYLINDER HEAD TABLE
ST2 498857100 VALVE OIL SEAL GUIDE
NOTE:
• Apply engine oil to oil seal before press-fitting.
• When press-fitting the oil seal, do not use a ham-
mer to strike in.
• The intake valve oil seals and exhaust valve oil
seals are distinguished by their colors.
Color of rubber part:
Intake [Gray]
Exhaust [Green]
ST2
Cylinder Head
7. VALVE LIFTER
1) Check the valve lifter visually.
2) Measure the outer diameter of valve lifter.
Outer diameter of valve lifter:
34.959 — 34.975 mm (1.3763 — 1.3770 in)
3) Measure the inner diameter of valve lifter mating
surface on cylinder head.
Valve lifter mating surface inner diameter:
34.994 — 35.016 mm (1.3777 — 1.3786 in)
4) Check the clearance between valve lifter and
valve lifter mating surface. The clearance can be
ME-00133
checked by measuring respectively the outer diam-
eter of valve lifter and the inner diameter of valve
lifter. If it exceeds the standard or offset wear oc-
curs, replace the cylinder head.
Valve lifter and valve lifter mating surface clear-
ance:
Standard
0.019 — 0.057 mm (0.0007 — 0.0022 in)
ME(H4DOTC)-75
MECHANICAL
ME-00134
ME-00135