Need an engine part that apparently doesnt exist anymore - Page 2 - SailNet Community
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post #11 of 16 Old 07-14-2012
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Re: Need an engine part that apparently doesnt exist anymore

I don't know where your located(hint theres a profile spot where you put this info) but here's a place that sells used parts. Its located between the bay bridge and Easton in Maryland American Outboard Motors and Salvage

Last edited by bandaidmd; 07-14-2012 at 02:43 PM.
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post #12 of 16 Old 07-15-2012
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Re: Need an engine part that apparently doesnt exist anymore

Most small engines of that vintage have a shear pin that fits into slots in the conical nut and a cotter pin that hold the nut and prop on. The drawing you link to doesn't show the shear pin. Strange. Can't believe that with all the models that part is used on (through 1991), they don't carry carry it. Maybe there's a substitute. I would try talking to a local outboard repair shop. They may know what might work.
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post #13 of 16 Old 07-15-2012
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Re: Need an engine part that apparently doesnt exist anymore

Quote:
Originally Posted by SloopJonB View Post
Easier to get a thread gauge and measure what it is. They don't cost much and are very useful.
JonB, I'm pretty sure the nut is SAE thread, the engine was manufactured by Mercury early on, but I'm not sure who manufactured that particular model/year. Back in the early 1980s I had a marine store and worked on them, but that was a long time ago and I no longer have all the details stored in my aging head.

Good Luck,

Gary
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post #14 of 16 Old 07-15-2012
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Re: Need an engine part that apparently doesnt exist anymore

I'm with the Castle Nut crowd. Cheap, easy and solves your problem.
There could be a keyed insert (or keyway) OR a shear pin that hold the prop in position relative to the shaft.
The Castle Nut will just keep the prop from spinning off in reverse gear.
If you have a 1" shaft I have and old Castle Nut you could have for free.
Good luck.

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post #15 of 16 Old 07-15-2012
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Re: Need an engine part that apparently doesnt exist anymore

I had an old mercury engine with the same nut, I also lost it, and had to buy replacements, I bought a spare, but gave the whole thing away a few years ago. The castle nut doesn't work. How it was designed is s flat washer with ears that are bent into slots in the cone kept it from spinning. As you found out if the ears aren't bent well, (check them every time you go out), the prop spins off.

If no one has the old parts, a machine shop can fabricate one. Or you could have them modify the shaft for a newer and more secure prop attachment.

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post #16 of 16 Old 07-16-2012
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Re: Need an engine part that apparently doesnt exist anymore

If the castle nut wont work CapnBill's idea of having a prop shop modify your shaft for a newer prop attachment sounds good to me.

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