115 Johnson making knocking noise
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  1. #1
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    115 Johnson making knocking noise

    Today, while on LA my 11yr. old 115 Johnson started knocking at just about all rpm's above idle. It had plenty of oil, and seemed to be using it out of the separate oil tank. A couple of times while on plane, it felt like I had run over a log or 2x4. When we got within sight of the fat farm, I idled on in, still knocking.
    At the ramp, I put it in reverse, and it sounded great, same while revving it in neutral, no knocking.
    Do any of you have a clue, as to what my problem might be? Possibly a bad gear in the lower unit?
    I definitely need to have it checked out. Any suggestions for a good OMC mechanic? :-/ :-/ :'( :'(
    A hot bite=> and a cold Lone Star......Nothing better!

  2. #2
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    Re: 115 Johnson making knocking noise

    I had a 75 hp johnson that was doing kind of the same thing. under the carbs the shift shaft connets to the shift rod had come loose. because of this the shifting was sloppy and it would not hold it in gear under power. there should be a bolt that you can tighten to make the shifter more solid. to check for sloppyness remove your shift cable at the motor and try to shift it into gear. you shouldn't have to move it far to go into gear. or just find were the shafts connect and tighten the screw to see if it is better.

  3. #3
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    Re: 115 Johnson making knocking noise

    Thanks Nathan,
    I hope it's something as simple, (and cheap), as that. But it's a pretty loud and noticeable knocking, and I'm afraid it's more serious.
    I haven't had time to check the lower unit oil for shavings or chunks. Maybe it's a gear or bearing in the lower unit.
    I hope so. It would be cheaper than a power head rebuild.

    I'm still looking for leads to a OMC/Bombardier mechanic.
    A hot bite=> and a cold Lone Star......Nothing better!

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  5. #4
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    Re: 115 Johnson making knocking noise

    I don't know of any off the top of my head. when mine was doing this it was because it was actualli popping out of gear.

  6. #5
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    Re: 115 Johnson making knocking noise

    I filed these away in my email archives for future reference - mechanic recommendation threads:

    http://www.austinbassfishing.com/cgi...num=1266290435

    http://www.austinbassfishing.com/cgi...num=1231510564

  7. #6
    Dez
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    Re: 115 Johnson making knocking noise

    Sounds like you may have hit something and broken a dog off the drive gear. I'd head to a mechanic if your not up to the task.




  8. #7
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    Re: 115 Johnson making knocking noise

    Thanks for the help gentlemen. I'll give Bob Walden and Kenny Klein calls. The worst part might be emptying the "miniature Academy" I have stashed under all the seats, and removing the depth finders and trolling motor.

    I'll let you know the diagnosis and approx. cost of repair.
    A hot bite=> and a cold Lone Star......Nothing better!

  9. #8
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    Re: 115 Johnson making knocking noise

    Depending on where you live, you could always try Buchanan Boat Works just west of Buchanan. *Joe and Luann are very reasonable and great people to work with. *512-793-2987

    720 Old Spanish Trl, Buchanan Dam, TX 78609-2534

  10. #9
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    Re: 115 Johnson making knocking noise

    Bad news............lower unit is shot, according to Kenny at Klein Marine.
    Oh well, what's $2500, with Christmas and taxes coming?
    Hopefully I will be on the water again in about a week.

    P.S. If you ever replaced your impeller yourself, on a Johnson/Evinrude, be very careful with the shift shaft adjustment. I was "close" in doing it a couple of years ago, (it was working), but evidently not close enough. I'm thinking the forward gears weren't meshing closely enough, and that's probably caused my current expense.
    So much for "saving some bucks" by doing it myself. Lesson learned!

    :'( :'( :'( :'( :'(
    A hot bite=> and a cold Lone Star......Nothing better!

  11. #10
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    Re: 115 Johnson making knocking noise

    Sorry to hear. Will keep that in mind.

 

 
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