More Winter projects.

[david-bartlett]

Tuesday I picked up three "new" motors. A 1957 Johnson AD-11, a Firestone 5hp, and a Mark 10 Mercury. The Johnson was stuck from sitting, but it freed easily with some deep creep. Coils are original. Happy days.

I left the Merc and Firestone at the camp until I go that way again in a few weeks. Too much going on right now anyway.

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[green-thumbs]

Thee are afflicted with ambition.
Louis

[david-bartlett]

Looks like the Mark 10 is a 1957 also and the Firestone is a 1955.

[fleetwin]

Those projects will keep you busy

[david-bartlett]

I was checking compression on the AD11 today and got just about 80psi using my cheap HF gauge. I am happy with those numbers considering it was stuck when I got it.
I noticed the pistons are very clean so either a low hour motor or someone has worked on it before.

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[20mercman]

I think these will keep you busy this winter, but they all look like great projects! I would probably approach them as you are. The AD-11 will be most likely the easiest one to resurrect and I would tackle that one first. The Firestone is also a pretty good motor, and I’d do that one next. I picked up a 5hp. Corsair Navigator on the "Free" pile at Tomahawk last year and just felt sorry for it. If nobody at an outboard meet wanted it, what chance did it have? 😆 It was stuck, but it was lower unit, not power head and after I rebuilt the lower unit and gave it a new pump and other TLC, it ran very well. We closed out our season with it! I think that for small full gear shift motors, Scott Atwater’s store brand motors, (without bail-o-matic), were really competitive with Mercury and OMC. (Firestone & Corsair Navigator) The Mark-10 is also an interesting motor and very powerful for a "10" horsepower motor. John McIntosh deals with them and is a huge fan of these. He sells tools and almost anything you could need for them. He runs them all the time! These were really a "Super Hurricane" power head but 18cid, vs. 22cid. Yours is Charcoal and 57 was the first year for the Mk-10 and that paint color.

Steve

[garry-in-michigan]

I always thought Scott’s gearshift mechanism was as good or better as any made, although there gear case sealing sometimes left some room for error. Of course the OMC split case had problems if the spaghetti seal wasn’t properly trimmed. . . 🙂

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