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post #11 of 26 Old 06-27-2008
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Haven't done our A4's impeller yet, tho I should probably do so--if for nothing more than the experience/practice, so please forgive the question, but what is the zip tie or string for?

Jim
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post #12 of 26 Old 06-27-2008
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To keep the blades of the impeller slightly bent so that the impeller goes into the opening easily.

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post #13 of 26 Old 06-27-2008
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Quote:
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To keep the blades of the impeller slightly bent so that the impeller goes into the opening easily.
Ah hah! Cool! Thanks for the tip

Jim
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post #14 of 26 Old 06-27-2008
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JIm-

Just to illustrate the point:




BTW, make sure that you've pre-bent the impeller vanes in the correct direction. Not so good for the impeller if you've gotten that backwards.

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post #15 of 26 Old 06-27-2008
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Do impellers turn the other way in the southern oceans?

Ray
S.V. Nikko
1983 Fraser 41
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Boating for over 25 years, some of them successfully.
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Only when you're motoring backwards.
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Do impellers turn the other way in the southern oceans?

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post #17 of 26 Old 06-27-2008
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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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post #18 of 26 Old 06-28-2008 Thread Starter
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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
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post #19 of 26 Old 06-28-2008
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Quote:
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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.
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post #20 of 26 Old 06-28-2008
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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.

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—Cpt. Mal Reynolds, Serenity (edited)

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