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post #14 of Old 03-05-2012
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Re: How to destroy a diesel in one easy step...

Originally Posted by casey1999 View Post
By leaving the raw water seacock closed will the impeller actually run dry? The way my engine is set up the engine is below the water line. So when the seacock is closed, the water pump is flooded. Now when the pump starts, it cannot get a suction of water, but is the pump still flooded with water? I am not sure how it would go dry as that would mean their would need to be a total vacuum at the pump.
These units are pretty close to being 'positive displacement' pumps so they will push water out.. in any event I'd worry about heat from friction without the steady supply of intake water.

Certainly check your impeller for peace of mind... or change it, for that matter, for the same reason..


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