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deniseO30 09-15-2007 09:32 PM

OH duh! (lost my water!)
Seawater I mean :o :D Yesterday we did a trail run on the ramp with my boat on it's yard trailer, then put the boat back in the water. It never crossed my mind that all the water would run out the seawater intake. Now it's not pumping. it's a universal 5416, Oberdorfer pump, never had great flow but always pumped. This seems to be an air problem seals? gasket? We put a new impeller (Globe run dry type) in last month all was ok. Tomorrow morning I'll get the boat over to the dock and do the raw water hose and garden hose in a bucket routine and see if that works. My experiance tells me that the pump should be self priming though. The pump is about 10" above the water line.

deniseO30 09-15-2007 09:37 PM

is a check valve between the pump and strainer a bad Idea? Sounds like a solution to me. The strainer would clog before the check valve I think. It's real easy access in my boat. Then engine front is under the companion way ladder behind a plywood panel.

HatterasJack 09-15-2007 10:24 PM

I'm not an expert but I beleive you have more going on with your pickup than the impeller. Sounds like either a restriction or vacume is preventing water from priming pump! I have a yanmar and have never experienced a problem with the pump except for a clog or a exhalst elbow getting restricted. Sorry I can't offer any more than that. HatteresJack

Sapperwhite 09-15-2007 10:47 PM

Maybe try just barely breaking the seal on the cover of the raw water pump impeller. If you have an air lock preventing the pump from priming, then the air will be relieved through the break in the cover seal. Don't go to crazy, or you will have to replace the gasket on the pump cover lid.

It would be possible to get an air lock, but if you have a globe impeller it should be able to pull water before burning out. You might have a bigger issue.

Sapperwhite 09-16-2007 12:03 AM

Stupid question........ Did you check the inlet seacock??? Open or closed? If you didn't, maybe the yard help changed it without you knowing for some reason.

labatt 09-16-2007 01:44 AM

Are you assuming you have no flow due to no water coming out of the wet exhaust? If this is the case, the first time we opened up the raw water system, drained it and restarted it, patience was key. It took a good 20 seconds before the pump completely primed and water started egressing the wet exhaust.

sailingdog 09-16-2007 08:48 AM

I wouldn't put a check valve in the line, since a check valve increases the work the engine water pump has to do to get water into the engine—not generally a good idea.

Also curious, but why did you not close the raw water intake on the boat before hauling it???

As the others have said, it should self-prime, and if it isn't self priming, then you've probably got something else going on.

deniseO30 09-16-2007 10:24 AM

Will working on it later on.. there is water in the RW intake and it doesn't seem to be restricted but I plan of check all that. Thanks all.

Rockter 09-16-2007 12:54 PM


It happens to my ship all the time.

Take the hose off the engine side of your seawater pump, and let the water squirt in, then shut the seacock again.

Reconnect the hose and you'll be fine.... well, it works for me, anyway.

It will run fine until you lift the boat out again.... it sound like that is ofetn, if you have a trailer sailer.

deniseO30 09-16-2007 05:42 PM

OH well... It's the pump.. at the very least it needs to be rebuilt. the plate that covers the impeller is so worn the water just passes around it. the PO used screws that were too long also, so they didn't tighten the cover plate and the water just dripped out the bottom. then when we took it off the shaft seal on the inside is dripping into the engine.. Geeze why don't i just use an electric pump??? (because it would fail ) Thank you all for your input!

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