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  #1  
Old 05-29-2007
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Test running 2 cycle.

I've just rebuilt the water pump in my sailldrive. It has a evinrude 25 horse power head and I don't want to chance burning up the water pump. Does anyone know for sure if the water needs to be at pump level when I test it, or will the pump self prime? I need to know for sure.
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Old 05-29-2007
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Given that it is a saildrive, which might have just been put in the water... it is likely that the unit will self-prime, if the water is at the same level it would be if the unit was in the water. However, if the water is significantly lower than that, it may not be able to draw the water up that distance... since it isn't designed to do so.
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Old 05-29-2007
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Is the boat in or out of the water? If out, you will need to use a hose connected to a test connector.
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Old 05-30-2007
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The boat is still out of the water and soon to be launched. I made a test hose manifold as the manual directs and will use it, but my concern is: will the pump work, and how will I know it's working. You see I've spent many hours and dollars re-fitting everything else on the boat from rigging to the entire fuel system, this is the only thing I'm not sure of and I really don't know what to look for.
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Old 05-30-2007
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The manual should also show you where the water is pumped out after it has done its cooling job. Water in - water out - it should be that simple. I would start with the water source higher than the normal water line to make it easy for the pump to prime but I would also lower it to the water line once you are getting flow to be sure it can lift it the normal distance needed when in the water.... maybe even shut it off and try again with the source down low to be sure. Better to find out now if the pump can lift as designed.
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Old 05-31-2007
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Thanks all. Since I posted this, I have personally talked with two mechanics seperately about my delima, they both gave conflicting testimonies. You all have pretty much said the same thing together and my gut fealing follows your advise, I'll go with that. I don't know where the water line is with respect to the water pump, I can only believe the engineers would place the pump in close proximity to the water line, maybe a little lower. I feal much more confident after talking with you. Thank you all very much!

Dennis
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