1981 Johnson 35 HP "slipping" while in forward

Discussion in 'Outboard Maintenance' started by JHammond53, Aug 21, 2010.

  1. JHammond53

    JHammond53 Time to fish!!

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    Ok, I am not good at describing whats going on so I will do my best....

    Was out fishing today and on the way back I heard a sound like I hit something (didn't really hit anything) then I started hearing noises coming from what sounded like the prop. I ended up limping it back to the dock and went home.

    When I got home I was wondering if my prop spun, so I took off the prop and ran it with the ears. Put it in Forward and low and behold the prop shaft (no prop on) would spin then stop, then spin then stop, and I was hearing a funky noise. So I throw it back in neutral and all is fine. I throw it in reverse to see if it does it and reverse seems fine, no issues.

    I then proceed to "troubleshoot" the issue by putting it into forward again. Funny thing is (and probably most important detail) is I can move the shift lever back towards neutral (not all the way but just right before it shifts back into neutral) and the shaft spins fine, and noise is faint/gone.

    Any ideas?
     
  2. aflatsnut

    aflatsnut I Love microskiff.com!

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    Could be the gear on the end of the prop shaft. Drain lower unit oil and inspect, if you have metal shavings in it...not good.
    Also if oil looks milky, water has invaded your foot. Water is not a good lubricant.
     

  3. Frank_Sebastian

    Frank_Sebastian Well-Known Member

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    I think you have a problem with the shift dog. You can reverse the dog on the prop shaft and it will work for a while, but there is a groove on the dog to identify the front from the rear and OMC says not to reverse them. The metal is very hard so no repair is possible the only remedy being replacement of the shift dog AND gear. (OMCs not mine). I have replaced the shift dog only on my own engines and they worked fine for a long time never failing. They were older engines and saw a lot of use.

    Frank_S
     
  4. JHammond53

    JHammond53 Time to fish!!

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    Ok, sounds like I should start with the oil. I will drain it tomorrow and see what it looks like. If I have metal shavings does that pretty much mean its the gear/clutch dog?
     
  5. jcbottjer@gmail.co

    jcbottjer@gmail.co I'd rather be FISHING!!

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    if it isnt a tiller try adjusting the cables from the throttle box i forgot wich one is for the gearbox or the carb so play with it with the earmuffs on it

    look for these
    [​IMG]

    and they should be here
    [​IMG]

    sorry for the seperate pics, my motor is up on a cherry picker and i took the cables out of it

    i had the same problem
    i thought i spun my prop .....nope
    checked the shear pin............40hps dont have any

    but my buddys dad took a look at it and twisted them around and found the sweet spot because it wiggled it self loose

    if this dosent help im sorry
     
  6. JHammond53

    JHammond53 Time to fish!!

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    Thanks but fortunately/unfortunately it is tiller driven.
     
  7. jcbottjer@gmail.co

    jcbottjer@gmail.co I'd rather be FISHING!!

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    look under the cowling and if the gear selector is on the side (outside) it might have a linkage to the same configueration as the throttle and gear cables just set up for a tiller. there could possibly be a linkage from the external gear selector to a plastic threded piece
    (just like the link from the top of the black thingie to the carb)
    that should be bolted onto the part that opens the butterfly valve in the carb and sets into gear (the black thing under the fly wheel) and if you look on the bottom of that you will see a bolt sticking out with nothing on it; it was where the gear line was connected and it pushed right to left but yours should pull right to left from the gear selector on the side

    i dont know all the technical terms but if i could see it i could figure it out
    if you could try to get some pictures up so i can see what it looks like please
    [smiley=1-mmm.gif]
     
  8. JHammond53

    JHammond53 Time to fish!!

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    Alright, this is going to be somewhat long, but should be informative enough to get the point across.

    First up, here is a couple pictures of the motor with the cover off.

    [​IMG]

    [​IMG]


    When in neutral notice that this white "lever" is in the central position

    [​IMG]

    This is what it looks like in forward

    [​IMG]

    And this is what it looks like in reverse

    [​IMG]

    Nothing seems out of the ordinary to me with that when I am shifting gears. I simply put those up for reference on how I believe it works.


    Here is where I "think" lies the problem. Feel free to correct me if I am wrong as I am no outboard mechanic, simply just a hands-on kinda guy.

    This black rod sticks this far up when in neutral (which seems fine to me)

    [​IMG]

    Then when in reverse it sits flush. I have no problems with the motor in reverse, it runs fine.

    [​IMG]

    Then when in forward it sits about 1/8" to 1/4" (guess) below.

    [​IMG]

    This is where I think the problem lies because as said in the first post, when running in forward it seems to "slip" but when I pull the lever back towards neutral without going into neutral it seems to spin fine. Pulling the lever back towards neutral would cause that black rod to move up and sit flush like how reverse does.

    Let me know what you guys think.
     
  9. jcbottjer@gmail.co

    jcbottjer@gmail.co I'd rather be FISHING!!

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    is there a place to adjust the black rod?
     
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