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Repowering a 54' Donzi Sportfish

Discussion in 'Donzi/Roscioli Yacht' started by DOCKMASTER, Sep 5, 2019.

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  1. DOCKMASTER, Oct 18, 2019
    #61
    DOCKMASTER

    DOCKMASTER Senior Member

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    I’m planning (hopefully) to install the water maker in the stbd Laz forward of the removable fish box. This will make it inconvenient to access other than for maintenance. So I need a remote panel to handle all normal operations without needing to access the unit. And I like the concept of just turning it on or off with one button.
  2. Capt Ralph, Oct 18, 2019
    #62
    Capt Ralph

    Capt Ralph Senior Member

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    Modular or broadcasted components with a simple panel.
    Before you order your next R/O, open a new WaterMaker thread with your models of choice and let us eat up some more bandwidth and disk storage.
  3. DOCKMASTER, Oct 18, 2019
    #63
    DOCKMASTER

    DOCKMASTER Senior Member

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    Good idea! Oh wait, I did that already . See thread titled Watermaker and ER Monitoring recommendations.
  4. Capt Ralph, Oct 18, 2019
    #64
    Capt Ralph

    Capt Ralph Senior Member

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    Ha
    Found it. Some good ideas in there already.
    Ah, I was in hospital during that thread and missed it when I got back home.
  5. DOCKMASTER, Oct 18, 2019
    #65
    DOCKMASTER

    DOCKMASTER Senior Member

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    Sorry to hear you were ill. Hope all is well now. Didn’t mean to sound like a smart azz on my last post. Sorry.
  6. Capt Ralph, Oct 18, 2019
    #66
    Capt Ralph

    Capt Ralph Senior Member

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    Were better now. Thx.
    No S A found.

    Oh, What motor mounts are you using? Comes with Cat or your spec?
    I'm shopping for mounts and realized I have a lot to learn. All different from the old Ace mounts I'm used to.
  7. DOCKMASTER, Oct 18, 2019
    #67
    DOCKMASTER

    DOCKMASTER Senior Member

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    I’m using the resilient mounts from CAT. They are part of the overall package and specd specifically for the C18s. If you want details I can ask them.
  8. Capt Ralph, Oct 18, 2019
    #68
    Capt Ralph

    Capt Ralph Senior Member

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    I was wondering if they offered you choices and offered 20 questions like I'm getting.
    Seems freq is a big spec in fancy mounts. Used to be just weight and thrust.
    Cat probably figured this for your motor.
    Looks like this weekend I'm on the net trying to find Modern motor mounts 101 for dummies.
  9. Capt J, Oct 18, 2019
    #69
    Capt J

    Capt J Senior Member

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    Generally, I see motor mounts made/sold by the engine manufacturer on most of the boats I see...….Cat's have a CAT mount with a CAT part #, MAN the same.
  10. Capt Ralph, Oct 19, 2019
    #70
    Capt Ralph

    Capt Ralph Senior Member

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    Ole Detroit's don't any more.
  11. MBevins, Oct 19, 2019
    #71
    MBevins

    MBevins Senior Member

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    Not meaning to derail but why change them? My DDs have solid mounts, I wouldn't think they wear out.
  12. captholli, Oct 19, 2019
    #72
    captholli

    captholli Senior Member

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    Even though a motor mount may have a Caterpillar Marine part number doesn't mean that Cat made it. , All of Cats conical and resilient mounts are manufactured by Rubber Design and I would wager that 75% of all mounts out there on medium and high speed diesels are from the same company manufacturer (Rubber Design) as they pretty much have the market cornered.
  13. Capt J, Oct 19, 2019
    #73
    Capt J

    Capt J Senior Member

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    I agree, but CAT deemed those mounts to be a good choice for their engines. Which takes the guesswork out of which brand/type/style of mounts to go with in a re-power.
  14. PacBlue, Oct 19, 2019
    #74
    PacBlue

    PacBlue Senior Member

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    Good news on the cutlass bearing, how did you work out the shaft length? Assuming double tapered with a new coupling?

    What are you doing about the exhaust mufflers ?
  15. DOCKMASTER, Oct 19, 2019
    #75
    DOCKMASTER

    DOCKMASTER Senior Member

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    Yes, new couplings. Couplings include the commercial style keeper plate for the shaft. I’m buying the whole package (shafts, props, couplings,etc) from a reputable vendor we use all the time. I gave him the dimension from the trans output flange face to the aft edge of the strut. Gave him the new gear model and new output flange information and he worked up the “assembled” shaft dimension. Shafts will come already machined and blue fit to new props. We will do a quick blue fit to verify before final install.

    Currently planning to use existing water lift mufflers but haven’t spent much time on this yet and open to suggestions.
  16. Capt Ralph, Oct 19, 2019
    #76
    Capt Ralph

    Capt Ralph Senior Member

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  17. Capt J, Oct 19, 2019
    #77
    Capt J

    Capt J Senior Member

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    Due to the age of them, I'd simply replace the mufflers while you have the easy opportunity.
  18. DOCKMASTER, Oct 19, 2019
    #78
    DOCKMASTER

    DOCKMASTER Senior Member

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    They are under the cockpit in the Laz so no easier (or harder) now then another time. We’ll have a look at them and it is on my list to talk to CAT about alternatives. I would like to quite things down if not hugely expensive.
  19. PacBlue, Oct 19, 2019
    #79
    PacBlue

    PacBlue Senior Member

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  20. Donzi 54, Oct 22, 2019
    #80
    Donzi 54

    Donzi 54 Member

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    Your mufflers are completely glassed into the hull, is that correct?
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