5.3. Cooling System
The coolant must be changed at intervals of 1,200 hours operation or six months whichever
comes first. If the coolant is being fouled greatly, it will lead an engine overheat or coolant blow
off from the expansion tank.
5.3.1. Coolant draining
a) Remove the pressure cap.
b) Open the drain valve at the radiator lower
part to drain the coolant as the right fig-
ure.
c) Loosen the coolant drain plug.
Loosen the coolant drain plug of the
cylinder block and oil cooler.
CAUTION :
When removing the pressure filler cap
while the engine is still hot, cover the cap
with a rag, then turn it slowly to release
the internal steam pressure This will pre-
vent a person from scalding with hot
steam spouted out from the filler port.
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