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Impeller Change Interval

Discussion in 'Technical Discussion' started by CaboFly, Mar 5, 2019.

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  1. Beau, Apr 21, 2019
    #21
    Beau

    Beau Senior Member

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    I agree with you completely. The visual ability to inspect would be an asset . General thinking here is every 2 to 3 years on the change. Mine always come out like new. I feel like I should go into the 'used but like new' impeller market.
  2. Pascal, Apr 21, 2019
    #22
    Pascal

    Pascal Senior Member

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    I can’t imagine a clear material holding up tonthe heat but most importantly not getting scratched and turning opaque by hundreds of hours of impeller rotation.

    Pulling the cover to inspect isn’t difficult but even that won’t tell the whole story
  3. Beau, Apr 21, 2019
    #23
    Beau

    Beau Senior Member

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    Probably some aerospace material available. There would have to be a center pin and plate built in to prevent the scouring?


    Signing off . Happy Easter to all - the ham is ready!
  4. Pascal, Apr 21, 2019
    #24
    Pascal

    Pascal Senior Member

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    Reinventing the wheel... never works :)
  5. Beau, Apr 21, 2019
    #25
    Beau

    Beau Senior Member

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    Making it better always does, I think. Stone to anti- puncture rubber. And air ride! Don't even need to get out of you vehicle to measure air pressure. And, thank god we're not wearing those pelts.... Think about that multidirectional wheel - the gimbal ball. Your computer mouse wouldn't be there at your right hand

    But enough about wheels, IMMO a see thru cover ads value to the equipment, but is not a panacea.
    Last edited: Apr 21, 2019
  6. Capt Ralph, Apr 21, 2019
    #26
    Capt Ralph

    Capt Ralph Senior Member

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    150 hours.
    Always check the gen sets yearly.
    20190415_152738 a.jpg 20190415_152745 a.jpg
  7. Beau, Apr 21, 2019
    #27
    Beau

    Beau Senior Member

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    Was there a basket or racor on that intake? that's not age damage in my opinion. Also looks like its on the "lee" of the set?
  8. Capt J, Apr 21, 2019
    #28
    Capt J

    Capt J Senior Member

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    I change gensets annually or about every 100 hours if they've been sitting a while. I'll go 200 hours if we're on a trip and the hours are being put on day after day. They're so cheap and easy to replace, that if I'm pulling the cover plate off, whatever is in there, is getting changed. Mains I will go 2 years and more hours on, not generators.
  9. Pascal, Apr 21, 2019
    #29
    Pascal

    Pascal Senior Member

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    I don’t think I ve ever gone less than 500 hours on genset impellers, even OhNos. But for us that’s 6 to 9 months...generators give you plenty of warning, you can just hear it s a little dry. Now if you only have one genny on board, you need to be a little more conservative. :)
  10. Capt J, Apr 21, 2019
    #30
    Capt J

    Capt J Senior Member

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    Granted you're dealing with larger generators and larger impellors. Most of the generators I'm dealing with are in the 10-25 kw range and tend to beat up the small impellors faster. Plus, you're generators are running a lot and often. You're doing 500 hours on 2 different gens in 6 months. I prefer to change impellors at the home dock... not on a trip where I have a million other things going on....….but again different situation.
  11. Pascal, Apr 22, 2019
    #31
    Pascal

    Pascal Senior Member

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    No much difference in size. My norpro is 15... the johnson I used to run had 20 NL and even the Lazzara “only” has 27.5 Ohnos. I hate them. They updated the water pumps to a new style which has a smaller outlet... they’re louder even with fresh impellers.
  12. Capt Ralph, Apr 22, 2019
    #32
    Capt Ralph

    Capt Ralph Senior Member

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    1) was trying to demonstrate an end view does not mean you can see the condition of an impeller.
    2) that is not old age or high hours. Why it's good to check everything before a trip as this customer did.
    Later model NL12.
  13. Beau, Apr 22, 2019
    #33
    Beau

    Beau Senior Member

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    Indeed, and well done
  14. cleanslate, Apr 22, 2019
    #34
    cleanslate

    cleanslate Senior Member

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    I have to say that is an odd rub wear on the impeller , not very uniform...something is gnawing on it seems to me. Don't you think? Anyway I'm still up for a clear end plate! LOL...but as Pascal said , don't think it would stay clear for two long, as the regular bronze end plates get a bit scuffed up on the inside...Capt J, When you stop in Cape May this summer from one of your runs, look me up and you can stop by for my "Change the impellers Party!'' on my boat, assume the position...head down and ankles up! In the bilge. PIA..not easy. Think I need a bigger boat , with a walk around engine room.
  15. Capt Ralph, Apr 22, 2019
    #35
    Capt Ralph

    Capt Ralph Senior Member

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    AND, Just on one blade.
    F M
  16. leeky, Apr 22, 2019
    #36
    leeky

    leeky Senior Member

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    No static at all. (Sorry, I couldn't control myself.)
  17. Norseman, Apr 23, 2019
    #37
    Norseman

    Norseman Senior Member

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    Timely thread:
    Pulled the water pump today for an impeller change: 2 years and 210 hours in service, looks okay but built up a memory.

    EAFCFA11-3DD2-4EBF-92A5-4DDFB5B19AC1.jpeg
  18. Capt Ralph, Apr 23, 2019
    #38
    Capt Ralph

    Capt Ralph Senior Member

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    I remember years ago a company offered a speed cover kit.
    Wing nuts and slots from the end plates mounting holes.
    This things still around?
  19. Norseman, Apr 23, 2019
    #39
    Norseman

    Norseman Senior Member

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    Have seen the speed kits, my kind of program. :D

    Can’t use ‘em on my boat, motor is shoehorned in a small opening. :mad:
    Last edited: Apr 23, 2019
  20. Norseman, Apr 23, 2019
    #40
    Norseman

    Norseman Senior Member

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    A bottle of rum if you can spot the impeller face plate, AND get the impeller out without removing the water pump:

    3DD8D4D2-A210-46C9-9E5A-F2C5AC609267.jpeg
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