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Go Back   SailNet Community > On Board > Gear & Maintenance > Replacing Impeller
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Thread: Replacing Impeller Reply to Thread
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Topic Review (Newest First)
06-29-2008 08:12 PM
Mark1948
Impeller Replacement

I will probably start a real argument, but on some motors the impeller shaft can be removed making replacement of the impeller much easier. My universal 18 is such a motor. Check the Universal web page at Torrenson (sp), Mechanics debunk many myths. You can remove the brass constrictor (not the correct term, but my info is on the boat) for ease of replacement as well. A hose clamp tightened down with the impeller center, and on the shaft, simply slide in and refit, replace constrictor. Oil a little replace gasket, and cover with a thin film of oil and replace cover. Get spare screws as these are easy to drop and become lost in the engine compartment.
06-29-2008 07:31 PM
Maine Sail
Quote:
Originally Posted by camaraderie View Post
Some claim premature failure..generally not the loss of a "wing" but rotation of the rubber on the center section. I have not found this issue and they do not degrade in the "rubber" part anywhere near as fast as the black ones. As they are so cheap, I always carry spares but have only had good experience and no need to replace as often as the black ones.
I had two Globe impellers spin the hub on a Universal M-25. I went back to the regular impellers. In theory they are a great idea but after two spun hubs at the most inopportune times and I had no choice but to go back to regular impellers..

I change mine every year.. Five minutes and never a head ache..
06-29-2008 07:00 PM
camaraderie Some claim premature failure..generally not the loss of a "wing" but rotation of the rubber on the center section. I have not found this issue and they do not degrade in the "rubber" part anywhere near as fast as the black ones. As they are so cheap, I always carry spares but have only had good experience and no need to replace as often as the black ones.
06-29-2008 01:42 PM
SEMIJim
Quote:
Originally Posted by camaraderie View Post
Rather than the KY I prefer the built in lubrication and RUN DRY capability of the Globe brand impellers.
Thanks for the hint, Cam. I'll have to look into this.

Quote:
Originally Posted by camaraderie View Post
Some people have had bad luck with them ...
What kind of "bad luck?"

Jim
06-29-2008 11:27 AM
camaraderie Rather than the KY I prefer the built in lubrication and RUN DRY capability of the Globe brand impellers. Some people have had bad luck with them but most swear by them and they do compensate for the occasional lapse of memory at the through hull! Here's an excellent article on them AND how to change an impeller.
http://www.sailmag.com/boatworks/bw08.impeller.pdf
06-29-2008 10:44 AM
cardiacpaul ummm, uhhh, the zip ties are a good idea, sting, anything to "pre install" is a good idea.
As far as pre-lube, i used to use vasoline, but ummm, uhhh, try one of those "personal" lubricants... very slippery.
06-28-2008 11:59 PM
sailingdog I recommend not damaging the impeller if at all possible, since they can often, if they are still in good shape, serve as an emergency backup. And yes, some of the plastics/rubbers used in impellers can be damaged by petroleum based products, like Vaseline.
06-28-2008 09:32 PM
brak
Quote:
Originally Posted by KindOfBlue View Post
As for removing, my PO left me a impeller puller. I find it very useful. Before I discovered what it was, I used needle nose pliers and the puller makes a big difference on my Yanmar 4JH. I never had problems pulling off the impeller with pliers on my old Universal M3-20. So first try pliers and if you find it difficult, invest in an impeller puller (Jabsco makes them).

I have Yanmar 4JH and had no trouble removing old impeller with pliers - not even needle nose, just regular pliers - I don't care if I damage it, it's going into trash anyway Just grap a blade and pull.
06-28-2008 09:26 PM
ccriders
Replacing Impeller

Well, for what it is worth, the Oberdorfer 202M 07 water pump does have a circlip that holds the impeller onto the shaft. The shaft, however slids out quite easily, making removal of the circlip a piece of cake. I don't think I could do it while it was inside the water pump housing. It is also very easily reinstalled with the tie-wrapped, circlipped impeller in place on the shaft. Couldn't find the paper thin gasket that is listed in the distributers parts book, nor could I find the very thin paper gasket material, so I used a liquid gasket material intended for water pumps. I'll see tomorrow how well that works as it takes 24 hours to cure.
Thanks for the input
06-27-2008 10:30 AM
KindOfBlue I use silicone grease because someone told me that Vaseline (petroleum jelly) or dish soap (also petro based) and rubber do not mix. Now that I think of it, petroleum is use and the making of automobile tires.. Maybe it's petroleum and latex that don't mix. In any case, I use silicone grease on my impeller.

As for removing, my PO left me a impeller puller. I find it very useful. Before I discovered what it was, I used needle nose pliers and the puller makes a big difference on my Yanmar 4JH. I never had problems pulling off the impeller with pliers on my old Universal M3-20. So first try pliers and if you find it difficult, invest in an impeller puller (Jabsco makes them).
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