Subaru Impreza 2002 Service Manual page 210

6. INTAKE AND EXHAUST VALVE OIL
SEAL
Replace the oil seal with new one, if lip is damaged
or spring out of place, or when the surfaces of in-
take valve and valve seat are reconditioned or in-
take valve guide is replaced.
1) Place the cylinder head on ST1.
2) Press in oil seal to the specified dimension indi-
cated in the figure by using ST2.
ST1 498267600 CYLINDER HEAD TABLE
ST2 498857100 VALVE OIL SEAL GUIDE
CAUTION:
• Apply engine oil to the oil seal before force-
fitting.
• Differentiate between intake valve oil seal
and exhaust valve oil seal by noting their differ-
ence in color.
Color of rubber part:
Intake [Black]
Exhaust [Brown]
Color of spring part:
Intake [Silver]
Exhaust [Silver]
7. VALVE LIFTER
1) Check the valve lifter visually.
2) Measure the outer diameter of valve lifter.
Outer diameter:
34.965 — 34.975 mm (1.3766 — 1.3770 in)
CYLINDER HEAD ASSEMBLY
S2M1924A
EN1518
ME(STi)-71
3) Measure the inner diameter of valve lifter mating
part on cylinder head.
Inner diameter:
34.994 — 35.016 mm (1.3777 — 1.3786 in)
CAUTION:
If difference between outer diameter of valve
lifter and inner diameter of valve lifter mating
part is over the limit, replace the cylinder head.
Standard:
0.019 — 0.051 mm (0.0007 — 0.0020 in)
Limit:
0.100 mm (0.0039 in)
F: DISPOSAL
CAUTION:
• Metallic sodium is enclosed in the exhaust
valve. Metallic sodium is extremely alkaline and
may produce severe chemical reactions. Full
consideration must therefore be given to the
following points when handing or disposing of
the valve.
• Since metallic sodium may cause blindness if
contacted with the eyes, burns if contacted with
the skin, and fire, do not deliberately take the
valve apart and remove the metallic sodium.
1) If the valve is damaged, remove the valve and
neutralize it by immersing it in water, and dispose
of it in the same way that general steel materials
are disposed of. The disposal method is described
in the following.
(1) Wearing rubber gloves, remove the dam-
aged valve from the cylinder head.
(2) Prepare a large receptacle (bucket or other
container) in a well ventilated location, and fill
the receptacle with water (at least 10 liters).
(3) Immerse the damaged valve in the recepta-
cle.
CAUTION:
A severe reaction may occur, so stand at least 2
— 3 m from the receptacle. Because the reac-
tion will produce hydrogen gas, moreover, keep
the receptacle away from sparks or flames.
MECHANICAL
B2M1400