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Compass Marine How To | all galleries >> Welcome To >> External Strainers - OMG > Cause = Improper Orientation of Scoop Strainer
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Cause = Improper Orientation of Scoop Strainer

Cause = Improper Orientation of Scoop Strainer

This owner was the lucky recipient of an engine hydrolock event while under sail. When he went to start the engine a cylinder was filled with water, and water is in-compressible.

"But RC it worked for 6 years with no issues."

Another way to look at that:

"You got lucky for 6 years."

Yes, a professional boatyard did this installation... Apparently no one informed them that when sailing with a "scoop strainer" water can be forced up and over the siphon break, into the water lift muffler and can eventually back fill a cylinder. Raw water pumps are not shut off valves and they do and can leak water by. Facing a scoop strainer forward is an incorrect installation for a sailboat. Heck directional scoop strainers should not even be used on sailboats..

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regi olbrechts05-Dec-2010 20:49
Had to look 3 times before I knew what it was and HOW it was!! ;-))
Well seen.