Subaru Impreza 2003, Service Manual

Page: 1062 / 3610

ME(H4DOTC)-88
MECHANICAL
CYLINDER HEAD ASSEMBLY
7. VALVE LIFTER
1) Visually check the valve lifter.
2) Measure the outer diameter of valve lifter.
Outer diameter:
34.959 — 34.975 mm (1.3763 — 1.3770 in)
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)
NOTE:
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 — 0.057 mm (0.0007 — 0.0022 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 handling 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.
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.
(4) Once the reaction is completed (about 4 —
5 hours have elapsed), carefully remove the
valve using large pincers so that the reaction liq-
uid does not contact your skin, and dispose of it
with other parts that are being disposed of.
(5) The reaction liquid is a strong alkaline solu-
tion, so it must be disposed of in accordance
with local regulations.
CAUTION:
Make sure the reaction liquid does not contact
your skin. If contact with skin occurs, immedi-
ately wash the affected area with large quanti-
ties of water.
ME-00134
ME-00135
ME-00755