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Thread: K&B 3.5

  1. #1
    Ram Jet's Avatar
    Join Date
    Aug 2008
    Burtchville, MI

    K&B 3.5

    I just rebuilt a K&B 3.5 outboard. Is the prop drive dog supposed to slip on the output shaft or do I need a new drive shaft/output shaft? I have the K&B lock nut and the "shock tubing" installed. I'm not new to engines but I am new to the K&B 3.5 outboard.

    If it ain\'\'\'\'t broke, don\'\'\'\'t fix it.

  2. #2
    Ron Olson's Avatar
    Join Date
    May 2002
    Kalamazoo, MI

    RE: K&B 3.5

    I'm trying to remember as it's been a while since I worked on one. It seems like one model used a set screw and another was a press fit. If it's sloppy then it needs a thrust washer. I've used the ones from Octura and Aeromarine as they're easier to get than anything from K&B/MECOA.
    Their schematic isn't any help but in a line drawing it shows a set screw but not in the exploded view, .
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  3. #3

    Join Date
    Mar 2010
    las vegas, NV
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    RE: K&B 3.5

    yes they are meant to slip on and off to replace the trust washer which goes between output shaft housing and the dog drive , the dog drive should have 2 allen set screws to tighten against the output shaft , i recommend a little loctite on each for vibration purposes. the thing you want to watch for is wear in the housing keep it well lubed with water proof grease and a well balanced prop or you are going to go through alot of output shafts , i found out the hard way , i have a k&b 7.5 outboard motor on a prather lap cat 2. well best of luck hope that was helpfull

  4. #4
    Dan S's Avatar
    Join Date
    Aug 2006
    Oromocto, NB, CANADA

    RE: K&B 3.5

    This link should also help you:

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