Disassembling an early Johnson gear foot?

[davidk]

Any guidance on how a Johnson Model A gear foot comes apart (and goes back together?

[The Boat House]

Most is obvious except –
1-Take out the prop shaft.
2-Turn the prop shaft gear so teeth are up
and it will slide under the drive shaft gear.
3-You have the slide this spring cover out
of the way (big PITA!!!) to get the pin out
to remove the drive shaft gear & driveshaft.
Tubs

[davidk]

oh, so the prop shaft should be able to be pulled from the gear? I expected that to be pinned and I couldn’t figure out how to get past the drive shaft pinion.

Water pump should be able to pul from the gear foot housing when the set pin is removed?
Thans Tubs!
-David

[The Boat House]

The piston of the pump runs on the cam on
the back of the gear so remove it first. Only thing
holding it in is the set screw with the lock
nut. They are usually tight and you have to
wiggle the pump to get them out.
The gear is keyed to the prop shaft.
Tubs

• This reply was modified 2 years, 4 months ago by The Boat House.

[davidk]

I wrestled with that prop shaft all day and couldn’t get it to relent. It was dry in there so maybe there’s corrosion? I’m soaking it in PB Blaster now. Someone, in the last 97 years, took the time to clean out the grease from the gear case and never refilled it. As a friend of mine likes to say “The enemy has been in here.”

Thanks, Tubs, for the guidance and for the parts display. Very helpful. -DK

[davidk]

Well, got it apart finally. Easy to see why it wasn’t parting easily. What a difference between these two lower units! The corroded cam chewed down the water pump piston. The last few runs of this motor might have been short with some rowing back to dock.

[Buccaneer]

Looks like that one struggle to stay alive until it’s last breath!

Prepare to be boarded!

[The Boat House]

Its a testament to those old Johnson’s. You
would think it would have quit running long
before it got to that point. Its not that uncommon
to find gear cases in that condition in motors
that don’t have seals. What frustrates me even
more than opening up one and finding that is
one with a really nice set of gears. Except for
a few teeth at the bottom of the prop shaft gear,
that are mostly gone, from sitting in water for
decades, because they didn’t bother to drain the
gear case the last time they used it. How did
you like the spring cover on the drive shaft gear Dave?
Tubs

• This reply was modified 2 years, 4 months ago by The Boat House.

[bobw]

Sometimes it’s amazing what you’ll find when you open up one of these old motors!

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[davidk]

That spring cover was no picnic Tubs! I marvel at the engineering of these old Johnsons but that spring cover is the kind of cruelty I usually find only in Mercurys.

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