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OMC Rotary Engine

Old 05-01-19, 06:07 AM
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OMC Rotary Engine

This is my next project that i started . I got a couple of OMC Rotary Engines, this project has not started out well I took apart the first engine as you can see the housing is severely damaged. I'm not a happy man at the moment







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Old 05-01-19, 06:11 AM
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The auxiliary air valve is a fatal flaw on these engines, if not remove this is what happens.







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Old 05-01-19, 06:22 AM
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I finish off the tear down of the engine and clean up the main parts of the engine, the side plates are in good cond so is the E shaft and the rotor. One thing i notice on the rotor there is a blind rivet, is that rivet meant to stop the bearing from slipping out ? I think i will replace the rotor bearing as well and replace the apex seals. But first i will look around to find a used or new housing.















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Old 05-30-19, 10:34 PM
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Good luck with the build. I had a few evinrude rotary sleds for a while. I rebuilt the engine in the one I used. They are a neat piece of engineering, but can be pretty touchy to keep running.
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Old 05-30-19, 11:21 PM
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Originally Posted by Buggy View Post
Good luck with the build. I had a few evinrude rotary sleds for a while. I rebuilt the engine in the one I used. They are a neat piece of engineering, but can be pretty touchy to keep running.
Thanks Buggy, what are your thoughts on the blind rivet inside the rotor? I was going to update my thread but looks like there no interest. there are a lot of lurkers out there.
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Old 05-30-19, 11:56 PM
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I'm interested
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Old 05-31-19, 10:09 AM
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Originally Posted by Sachs Man View Post
Thanks Buggy, what are your thoughts on the blind rivet inside the rotor? I was going to update my thread but looks like there no interest. there are a lot of lurkers out there.
I would assume it is there to retain the bearing in place as you said. I can't see any other reason for it being there. I may still have an old rotor kicking around for one. Ill have to look.
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Old 05-31-19, 08:37 PM
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Originally Posted by Buggy View Post
I would assume it is there to retain the bearing in place as you said. I can't see any other reason for it being there. I may still have an old rotor kicking around for one. Ill have to look.
It seems a bit odd to have a blind rivet to retain the bearing in place, I mean once you press a bearing in it should stay in situ. Did you find the same in your tear down on your engine?
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Old 06-11-19, 04:31 PM
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Originally Posted by Sachs Man View Post
It seems a bit odd to have a blind rivet to retain the bearing in place, I mean once you press a bearing in it should stay in situ. Did you find the same in your tear down on your engine?
It does seem odd. I honestly don't remember its been like 7 years since I had that engine apart. I'll look and see if I still have an old junk rotor kicking around. I think I sold pretty much everything I had though.
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Old 06-11-19, 11:00 PM
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Originally Posted by Buggy View Post
It does seem odd. I honestly don't remember its been like 7 years since I had that engine apart. I'll look and see if I still have an old junk rotor kicking around. I think I sold pretty much everything I had though.
Well I finally got the parts catalog for the omc engine. There is a part missing from the rotor which is a retaining ring, but there is no slot machine inside the rotor for the retaining ring.


Last edited by Sachs Man; 06-11-19 at 11:09 PM.
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