Tohatsu M8B Reverse Problems

Discussion in 'Boats, Blinds, & Gadgets Forum' started by SMathison17, Jul 9, 2018.

  1. SMathison17

    SMathison17 New Member

    Messages:
    11
    Joined:
    Jan 20, 2017
    Location:
    Dexter, NY, USA
    After spinning the prop yesterday and thinking the 20 year old Tohatsu M8B was dead (didn't realize it was a spun prop, thought she went and threw some gears) I decided it might be time to fix the reverse, that hasn't worked in 2 years, and was hoping some of you might be able to help.

    A few years ago some water got into the lower unit, froze, and crack the prop shaft housing. Since then the reverse on the outboard hasn't worked. If you trying to shift it into reverse, it just sounds like gears are grinding. It also is sometimes hard to find neutral when starting it, or will start in forward gear. Forward is fine.

    Today I was taking a look at it with the engine cover off. I notice that the shifting the gears, it the shift lever under the carb was not engaging in the reverse (https://i.imgur.com/bMjFIT4.png - the parts circled). I could make it engage by holding the lever in reverse and turning the prop, then it would actually engage all three gears with no problem. It only lasted for a little bit, because I walked away for a few minutes and when I came back neutral and forward were the only gears that it would shift into. I also have no clue if what I did would actually work with the grinding problem, as I wasn't able to run the motor.

    Does anyone have any clue on how to fix this, it would be really nice to have reverse again?
     
  2. spg

    spg Senior Refuge Member

    Messages:
    434
    Joined:
    Jul 25, 2003
    Location:
    Hermitage Pa
    Sounds like the clutch dog is shot..your going to need to drop lower unit for sure.
     
  3. Phytoplankton

    Phytoplankton Elite Refuge Member

    Messages:
    2,867
    Joined:
    Jun 26, 2008
    Location:
    CA
    At a minimum the clutch dog is shot. When the dog goes bad it usually just jumps out of gear. The grinding noise is more worry some.
     

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