Impeller damage ?
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Impeller damage ?

  1. #1
    "Mad" Member Jet Mad's Avatar
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    Default Impeller damage ?

    What would cause damage to the wear ring area of the impeller looking like it had the grooves machined on a lathe. The wear ring is scuffed, but not damaged.

    Secondly, I have 3 Impellers and not one of them measures the same. (All are "A" for a 12JC Berkeley.

    1. SS impeller (Detailed)
    2. Original Berkeley "A" (orange)
    3. Impeller bought in a kit from an online store.

    Can anybody shed some light on the subject, if you look at the skirts of the impellers they all differ in height.

    Wikus
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    Last edited by Jet Mad; 04-27-2011 at 06:37 AM.


    Titan H2O Submersible Android Phone

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  3. #2
    Senior Member DuaneHTP's Avatar
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    Default

    Check your PM

  4. #3
    Senior Member
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    Default impellor

    in my experience some of the manufacturers use independent casting facilities and hence different "molds" or patterns if you will to cast the impellors. the a, b, c, sizes are approximate and not absolute,as a lot of the parts are farmed out to independent machine shops, i know that the tolerances can be held closely but this is not always the case, have used the expression before that a lot of the jet parts i.e. shafts, impellors, etc. are interchangable but not identical. some of the rebuild kits will include shims to space the impellor the proper distance from the wear ring. i believe your damage in the wear ring area was probably caused by debris in the pump causing excessive friction. i always warn the person rebuilding their pump that yes it can look simple and sometimes it is. it can also turn into a real challenge when these clearances are not verified before you stick some unmatched parts together and the "stacking of the clearances" become a problem. hopes this helps, my .02

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  6. #4
    "Mad" Member Jet Mad's Avatar
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    Default

    I never tow my boat further than 300m as I live on the Vaal River, but I have started the boat on the trailer a few times. I have set up the pump a little tight when I rebuild it the last time.

    I will never do that again

    Luckily I have ordered a SS impeller and Ultimate Wear Ring from Duane and with his help I will set up the pump with the correct tolerances.

    I wish I could sent the pump to the US, but it will literally cost me an arm and a leg if I go that route.

    In hind sight - Never ever run the pump on the trailer, Never and that is all I have to say about that.

    Wikus


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