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Post  flying poodle Wed Jan 06, 2016 2:36 pm

I stopped in a local hobby shop yesterday for glue and found a Medallion 15. It has plier marks everywhere but it turns free and has good compression. Got it for $20!

When I got it home a found that the props I had (APC 7x6 and a wood 8x4) will need to be reamed out to fit the prop shaft. Is this a normal thing? Also, there appears to be a good bit of play, about 1/8' or more, in the drive shaft. Could the thrust washer just need to be seated better.

Also, is this a ball in socket piston or is it pinned.

Thanks in advance, and any other info on the engine would be welcome.
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Post  Jason_WI Wed Jan 06, 2016 4:01 pm

Medallion 15s can have either the ball socket piston or the later wrist pin/con rod setup.

The crankshaft endplay is a bit concerning. Medallions didn't come with a thrust washer normally. If someone used an electric starter then the drive plate could have a groove cut in it. Adding a thrust washer between the drive plate and crank case would fix most of the slop. The front of the crank case could also be worn down some.
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Post  cox24711 Wed Jan 06, 2016 6:52 pm

flying poodle wrote:I stopped in a local hobby shop yesterday for glue and found a Medallion 15.  It has plier marks everywhere but it turns free and has good compression. Got it for $20!

When I got it home a found that the props I had (APC 7x6 and a wood 8x4) will need to be reamed out to fit the prop shaft.  Is this a normal thing?  Also, there appears to be a good bit of play, about 1/8' or more, in the drive shaft.  Could the thrust washer just need to be seated better.

Also, is this a ball in socket piston or is it pinned.

Thanks in advance, and any other info on the engine would be welcome.      

wow I got mine for $48 au $ it run perfectly dose yours have a thin wall cylinder or thick wall cylinder? the thin walls have ball joints the others don't. hope you have fun with your no jem hope you have fun .if you do need to reset the ball joint ask Jason about that he has the tool! lol! Very Happy
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Post  flying poodle Thu Jan 07, 2016 8:31 am

Thought I would post some pics.

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