Yanmar 1GM, Руководство по эксплуатации

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Important
Do not stop the engine with the decompression lever. If the decompression
lever used to stop the engine, fuel will spray out and accumulate on top of
the pistons. This will create the danger of an explosion the next time the
engine is started.
2) Be sure to close the kingston cock after stopping.
3) Drain out the cooling water. In winter and in periods of col
d weather when there is the possibility that the cooling water may freeze, the cooling water
should be drained out after use.
3-a)
Open up the cylinder body side cock located below the intake silencer and drain out the water
in the cylinder.
3-b)
Open up the cock in the lower part of the exhaust manifold and drain the water from the
manifold. (for 3GMD, 3HM)
3-c)
Turn the crankshaft 2-3 times by starter motor to remove any water remaining in the cooling
pump.