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Engine overheat-yanmar 2qm15
From: (Richard Kollmann) Organization: http://groups.google.com/ Newsgroups: rec.boats.cruising Date: 11 Aug 2003 05:59:20 -0700 Subject: Engine overheat-yanmar 2qm15 In these engines with water lift mufflers extra pressure is required of the raw water pump at high power to over come the exhaust pressure. Motoring into rough water adds air bubbles to the system reducing pressure and can stop all flow of water. A through hull water scoop helps control this problem by forcing the air through the pump. Have you cleaned out the outlet fitting on the heat exchanger and the inlet water fitting on the exhaust elbow? Has the raw water pump cam been replaced? In charter boats these cams only last about three years in the older small Yanmar engine. From the author Of books on Boat Refrigeration http://www.Kollmann-marine.com Well, damn, that is another angle I have not heard before, my old yanmar is raw water cooled, just a thermostat to direct the water for temp. control, I'll check the inlet fitting when I flush the engine, and replace the raw water pump cam. Thanks. Maybe I should get a storm sail?!! George Pappas S2 9.2A "EXO" |
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