Subaru S209 2019 Service Manual page 72

MECHANICAL
• When the exhaust valve is broken, remove it
from the cylinder head, perform appropriate
processing in the same manner as the general
steel material.
• When performing processing, be careful of
the following.
1. Prepare the fire extinguisher nearby.
2. Wear the protective goggles.
3. Wear rubber gloves.
1) Wear rubber gloves and remove the broken ex-
haust valve from the cylinder head.
2) Prepare large container (bucket or oil can) in
well-ventilated place, and fill the container with wa-
ter (10 L or more).
3) Using a pair of large tweezers or pliers, immerse
the broken exhaust valve in the water vertically.
CAUTION:
• Completely immerse the broken exhaust
valve in the water.
• Hydrogen gas is produced by the chemical
reaction. Therefore, always keep the container
away from open flames such as sparks.
• Because the severe chemical reaction is de-
veloped, keep at least 2 to 3 m away from the
container.
4) After completion of chemical reaction (after the
elapse of 4 to 5 hours), carefully take out the ex-
haust valve using a pair of large tweezers or pliers,
and dispose of the exhaust valve according to the
same disposal procedure as general steel materi-
als.
Cylinder Head
CAUTION:
• Concerning the liquid waste disposal of the
liquid (sodium hydrate) produced in a chemical
reaction, follow all governmental regulations
and local regulations related to the liquid waste
disposal.
• If the liquid produced in a chemical reaction
(sodium hydrate) should touch the skin, imme-
diately wash it away with plenty water.
ME-21589
ME-4