Parts compatability with 1956 Johnson 10hp

[gabriel]

Been looking at some other motors to possible use as parts for mine. I need a new shifting fork (part #375755 "Shifter Lever and Pin Assembly"), my clutch dog is rusted to the cradle (what broke the shifting fork), and the forward & reverse gears are a little bit chewed up.

I found someone selling a cheap 1954 10hp which I’m quite sure is actually a 1955 judging by the decals. Which, if any, parts could I transplant to my motor? They also have a new prop for it which I wouldn’t mind.

Also found a 1956 and a 1958 10hp together for a pretty good deal. Would the ’58s lower unit be a direct swap?

[frankr]

1958 was a year of change, so no on that one. Likewise, 1955 was a year of change, so a ’55 will work, ’54 won’t. There may be internal parts that will swap 1954-55-56, can’t say for sure without going through the parts books

[dave-bernard]

check your PM
I have one

[mr-asa]

Frank, the part number in my book for a ’54 matches that part number he has.

I have actually been looking for the powerhead from a ’54 10HP. A ’54 has the seahorse cast into the leg. If you end up buying it I might be interested in the powerhead. The powerhead is a one year part number, so it won’t match anything but another ’54

[fleetwin]

Gabriel
The 1958 10hp gearcase would NOT fit on your engine. The 10hps used the larger 15/18hp style gearcase up through 1957, OMC adapted the smaller 5.5/7.5hp gearcases for the 10hp in 1958.
I’m thinking the closest match would be the 1956 10hp gearcase, unless you are positive the 54 10hp is actually a 55 10hp.
Keep in mind that spending money on these complete engines to salvage a few parts might lead to disappointment. The clutch dog and gears are likely to be worn on most old 10hps, so don’t pay a lot because this is just a gamble.

[gabriel]

So in general if the part number is the same for motors regardless of year then that part is the exact same?

[beerman57]

For mechanical parts, yes. For things like cowls, just because of being for different years they have different numbers, even though they fit more than one year.

[chris-p]

Gabriel Im in Ontario as well, and stock a large inventory of OMC parts. PM me if you end up needing anything.

[retiredoz]

My Johnson book calls for the same gear set for QD-12 thru QD-16B.

[1946zephyr]

The ’54 and older is a four bolt lower unit mounted with 1/4 20 bolts. The gears may possibly be different to. The ’55 – ’57 has the larger 5 bolt lower unit, so those 3 years will have more compatibility. If you just need a fork and dog, i would just forgo buying a complete motor for now. A member will likely furnish you a good fork for cheap, but the shift dog, will be hard to find in good use able condition. This will deliver better service, if replaced for new.

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