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From what I’m told, the subject motor is very similar to it’s Mercury Mark 25 big brother.
As mentioned the other day, it jumped into forward all by itself when
running.
I pulled the powerhead today so I can work on the shifter mechanism.
There’s a notched pieced attached to the shift handler, and a spring clip
that rides in the notches to act as a detent.
I’m not sure if there’s any other detent, i.e, a spring loaded ball,
under the handle mechanism or not?At any rate, it appears I need to remove the throttle shaft that crosses
over the shifter mechanism, so I can remove the three 5/16″ bolts
that hold the shift shaft and mechanism in place.So far I’m not able to remove the big nut to remove the tiller handle
and throttle shaft. The locking tabs washer is “unlocked”, but the threaded
shaft to which the nut is on, wants to turn with the nut.
Any ideas if I’m on the right track as far as procedure, or how to get
the big nut off?
Thanks.
VIDEO……..
https://youtu.be/YKAlFkZepgA
Prepare to be boarded!
I was able to remove the big nut on the tiller that allows access to remove
the shift shaft (once the tiller and throttle shaft are out of the way) by
putting a big wrench on the nut, and slapping said wrench with a 2×2 maple
board.
So far I’ve found no more detents other than the spring clip
that engages the three notches, just under the shifter.
I have not tore into the gear case yet though.The reverse lock cam / ramp system appears to be the main
issue I see so far. When in neutral, the cams are on the verge of
sliding on their ramps, which is suppose to happen when
one shifts to Forward…… cams slide together, releasing the
hooks on the transom mount pin. The reverse lock “hooks”
are under spring pressure, which aids in the unwanted self shifting.I can see where it would take little vibration for the shift lever
to jump into Forward by itself.
The bottom half of the cam / ramp has a set screw, and a flat
on the shaft. The set screw on this motor was loose, which was
not helping maters.I’m guessing the shift shaft spline was not oriented correctly
into the gear case, as the shift lever never did engage into
the “forward notch”, which it did, after I dropped the gear case.VIDEO………
Prepare to be boarded!
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