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Thread: Another Outboard Question

  1. #1
    Supporting Member Hoyt-Hunter's Avatar
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    Default Another Outboard Question

    I have a Yamaha 150 with about 1/8th inch play in the prop shaft. Is that normal normal or should/can it be shimmed?

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    Which direction is the shaft play, aft to bow, or lateraly?

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    Supporting Member Hoyt-Hunter's Avatar
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    It moves aft to bow

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    Are you sure it's shaft play and not play in the prop? I've got twin Yamaha 150s on my boat and there's no shaft play. The old props had a little play in them but the shaft is pretty solid.

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    Supporting Member Hoyt-Hunter's Avatar
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    I thought that at first too. But I took the prop off and still getting play from the shaft.

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    Does it go away if you shift it into gear? (While not running of course! )

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    Supporting Member Hoyt-Hunter's Avatar
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    Have not tried that yet. However while it was running at low rpms (below 900) the motor would vibrate, which is why I started looking into it.

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    Member patrickL's Avatar
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    Neither of my motors have any play in their prop shafts. My gut tells me that something's not right but I'm far from an expert on this. I've talked to the main shop guy over at Deweys and he seems pretty good. You might stop in there and talk to him. He could at least give you an idea if you have something to worry about.

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    Supporting Member Hoyt-Hunter's Avatar
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    Thanks Patrick, I probably will have someone take a look unless i find out it is fairly easy to fix. Was hoping that it might be as easy as shimming it, but will see.


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    Member SockeyeOne's Avatar
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    Quote Originally Posted by SockeyeOne View Post
    Does it go away if you shift it into gear?
    Quote Originally Posted by Hoyt-Hunter View Post
    Have not tried that yet.
    This will help isolate where the slop is coming from. Drive shaft, shift spool, bearings, etc.

    I have schematics for that unit if you need them. I also have a smaller Yamaha lower which is apart if you want to see pics.

  11. #11
    Supporting Member Hoyt-Hunter's Avatar
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    It has a small amount of play when in gear, more when in neutral


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    Member SockeyeOne's Avatar
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    Thats what I was looking to hear Hoyt. Less play in gear is a good thing for you. Same play in gear is a sign the lower is getting worn out.

    Any metal in the lower unit fluid when you changed it last? (Check like you are panning for gold. Pour off the bulk of the old fluid into a safe container and slosh the dregs around in the drain pan slowly to look for sparkles and water drops) Do you change it every season? Are you using Dino or Synthetic in there?

    I know, I know. Lots of questions, but it really helps narrowing things down. There is about sixteen bazillion parts in there, (Well maybe not quite that many) and knowing the answer to some of these questions helps preventing costly wild goose chases.

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    Supporting Member Hoyt-Hunter's Avatar
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    Yes, there is metal fouling a on the magnetic lower plug. I do change it before I winterized it every year. And I am not using synthetic.

    Thought that some fouling was normal. Doesn't seem like there is an excessive amount, I could be wrong though.


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    Eventually enough material gets worn from the internals, as evidenced by the filings on your plug, that some slop develops. Whats important is to address wear issues soon after detecting them because often times they cause more serious problems (read expensive) down the road.

    I wouldn't say you have much serious going on yet. Probably some shim wear and maybe a little bearing end play. Its honestly hard to tell not seeing the unit though.

    Start using the synthetic gear lube if you can. Its a bit spendy but it helps by providing better lubrication which will reduce wear over time.

    There is a service manual available for that powerplant which shows the lower unit assembly in good detail.

  15. #15
    Supporting Member Hoyt-Hunter's Avatar
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    Thanks for your help Sockeye. I will definitely get on top of this before next season.
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