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  1. #1
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    Another Merc to Johnson prop question

    Trying to install a merc chopper on a Johnson. I know I can drill the front side of the splines out with a 1 inch whole saw until it hits the thrust washer. Once I do that it looks like I will have a lot of shaft showing were the prop nut goes. Will that be ok???
    Attached Thumbnails Attached Thumbnails 20140910_175327.jpg   20140910_175330.jpg  

  2. #2
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    There are two different castle nuts I have had , one is wider, and you can use a spacer or washers behind it. how far off are you from the cotter pin going through the castle nut?

    Steve

  3. #3
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    Use a splined spacer.

  4. #4
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    So doesn't matter how much of the shaft is showing at the prop nut side and long as there spacer to lock the nut down?

  5. #5
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    Use an omc or yamaha spline washer/spacer as said above.
    Larry Gempp Jr.

    Proud HydroStream Powertour Member

    Lots of past boats - 2024 22 Liberator - 450R


  6. #6
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    Sometimes I have 3/8+" showing. Never had a problem. There are also different sizes of thrust washers in front of the prop. I have a collection of both for different props.

  7. #7
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    For my buddies boat he uses a combination of OMC spacers and the Merc tab spacer depending on the prop and how much space there is.

  8. #8
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    You might have to mill off the weed cutters, I had to for my chopper.

  9. #9
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    Thanks for the replies guys. Does anyone have a pic of a splined spacer? Are the weed cutters the 3 taps on the front of the prop and can I remove them myself with a cut off wheel?

  10. #10
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  11. #11
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    Thank you sir. That what I thought they looked like. Just want to make sure I'm not missing anything.

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