replacing cutlass bearing and maybe prop

Discussion in 'Mechanic's Corner' started by shorething, Jul 11, 2019.

  1. shorething

    shorething Member

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    My 1987 ConWalk 20' won't turn more than 3300 rpm @ 30 mph WOT. I'm fine with the top speed, but I know I should be turning closer to 4400 rpm WOT. Also, the boat developed some vibration last year, and there was a little more play in the cutlass bearing than I think there should be, so I need to replace it anyway, and am hoping that cures the vibration. So,... I just pulled the prop and pressed out the old cutlass bearing (1" x 1-1/2" x 4").

    I am considering replacing the original 13 x 13 prop with an Acme 913 based on comments on this forum. I am looking for any recommendations or comments on the Acme 913, and I am wondering if anyone has any recommendations on a brand and/or vendor for a replacement cutlass bearing.

    Thanks, and cheers!
     
  2. Gary S

    Gary S Well-Known Member

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    Deep Blue Yacht Supply has full length bearings,be careful some places sell 2 piece ones now.
    I'm running a 913. I had the same problem as you just would not pull the original prop, knew it wasn't the engine it only had 200 hours on it. Very happy with the Acme
     
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  3. lwarden

    lwarden Well-Known Member

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    Check Nettles for the prop. ACME are the bomb.
     
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  4. shorething

    shorething Member

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    Thanks, guys! Gary S, you already sold me on the Acme 913 a while back, but I thought I'd double-check to see if there are any negative comments. None - and thanks for the lead on the cutlass bearing!
     
  5. mikev

    mikev Well-Known Member

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    I will only change a pitch on propeller
    So you reach 4400rpm
    Is less expensive and you will be happy
    I was in same position
     
  6. shorething

    shorething Member

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    Thanks, Mikev! I've already got a new Acme 913, cutlass bearing and rudder and shaft zincs ordered and shipped. I happened upon a person with a new, unused Acme 913 that he bought new, but never used, and then he sold his boat, so I got a new unused prop at a big discount, and I'll keep my old prop as a spare.

    Thanks everyone for the replies!
     
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  7. Gary S

    Gary S Well-Known Member

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    Great let us know how it works out
     
  8. Jim Burnham

    Jim Burnham Active Member

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    I went with an 11.5 pitch prop on my 79 20' Pilothouse with original 302 and 2BBL with plans to eventually replace the engine. If I were sticking with this engine, I would go with the 913.
    ACME 543 3 BLADE 13" X 11.5" PROPELLER
    Presuming you've pulled the shaft to get the cutlass bearing out, you might want to consider:
    • Evaluate prop shaft - at least check if it's straight and polish it- or take it someplace to have it checked and have coupler faced
    • New two piece shaft coupler if the old one isn't usable (easier to put on)
    • New shaft log if original or at least new clamps and fresh packing (with the PTFE packing, I wouldn't bother with dripless)
    • Lube engine mounts and align
     

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