Yanmar 6LY3 series Operation Manual page 27

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SAFETY
CAUTION
If you have an installation with
two or three engines, and only
one engine is operating, the
water pickup (thru-hull) of the
non-running engine(s) should be
closed. This will prevent water
from being forced past the
seawater pump and eventually
finding its way into the engine.
The result of water entering the
engine could cause seizure or
other serious problems.
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6LY3 Operation Manual