|Topic Review (Newest First)|
|09-17-2007 04:50 PM|
Went to this Marine supply in NJ not far from here. One if my club friends raves about it. I get there... one word.. OBERDORFER... deap pan look and reaction. He makes two calls to Fla for the part numbers. Turns out he actually had the parts back there! New plate, seal and the gaskets which are exstreamly thin on this pump. Between the worn old plate and homemade gaskets the pump wouldn't pump or hold a prime. It's working now.. better then ever I might add.
Again thank you all for you input!
|09-16-2007 06:20 PM|
Denise, on starships the power is expected to be there all the time, so important things like life support and shields can operate, and if there's a power failure you've got big problems, it just ain't supposed to happen.
Sail diesel powered sailboats are built with a different philosophy in mind: That the electrical system can and will fail from time to time, from a dead battery if nothing else. And having a diesel engine that can be hand-cranked (in theory anyway) with fuel and water and oil pumps that all run off the reliable diesel engine, without electricity, is supposed to be a good idea.
So by all means, use an electric pump--if your electrical system is up to starship standards. [g]
|09-16-2007 05:42 PM|
|deniseO30||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!|
|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.
|09-16-2007 10:24 AM|
|deniseO30||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.|
|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.
|09-16-2007 01:44 AM|
|labatt||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.|
|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.
|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.
|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
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