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Old 07-07-2008
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Yanmar recommends reverse. The transmission is cooled by water circulated when the engine is on. If the transmission is left in neutral when under sail, the spining prop/shaft will cause some transmission parts spin without benefit of this coolant. Not a good thing. And, as you may be experiencing, the spinning prop shaft will allow some water to come in through the packing gland, but this should be minimal.
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