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  1. #1
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default OMC Rotary Engine

    OK more Rotary Engine projects. I got a couple of these OMC Rotary Engines, these engine were use in the Evinrude & Johnson Snowmobiles back in 1974, these two are the 45 hp versions there is a 35 hp version as well. 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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  2. #2
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    The auxiliary air valve is a fatal flaw on these engines, if not remove this is what happens. 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. and housing.

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  3. #3
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    I clean up the housing so i can get a better look at the damage

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  4. #4
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    54
    Posts
    5,208

    Default

    Ouch - that's not nice. Can it be welded up or will that warp everything to buggery?

    Michael

  5. #5
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    193

    Default

    Quote Originally Posted by Michael G View Post
    Ouch - that's not nice. Can it be welded up or will that warp everything to buggery?

    Michael
    No not nice,but that's why it was cheap. No can't weld it to much work and need to strip off the special coating and re coat it and machine it to the right profile and could warp everything. I place a order for a new housing from Freedom Motors

  6. #6
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    193

    Default

    I clean up the rotor and cooling fan components. The fan housings have a few cracks in them, the rotor is in good shape. The charge coils are crack, new ones are on the way.

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  7. #7
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    193

    Default

    Got a couple of new parts. New housing and new corner seals and springs and new Stator.

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  8. #8
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    193

    Default

    Been going through the Electrical system, the new Stator i can not use only the charge coils. The power pack, starter solenoid looks to be ok but the ignition coil is toast So on the look out for a new one. I have notice a lot of coils to suit OMC Johnson Evinrude Outboard Marine motors

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  9. #9
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    I drilled and tap a 1/8 pipe thread to seal off the valve

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  10. #10
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    I decided to pull apart the second OMC engine. This engine has been sitting for a very long time, all the seals are stuck so will give a good soak for a while. As you can see in the photos of the rotor there is a blind rivet and also a pin in the bearing race cup, so looks like these engines have the blind rivet and pin to hold the bearing in situ.

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  11. #11
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    The housing and side plates are in good cond, there is a small chip inside the housing surface . The chip is near the intake side so may be ok for running as is me thinks.

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  12. #12
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    31
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    1,031

    Default

    What is the chip caused by do you think, detonation?

    Great seeing the detail on these small rotaries keep it up.

  13. #13
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    Oct 2016
    Location
    Melbourne
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    193

    Default

    Quote Originally Posted by caskwarrior View Post
    What is the chip caused by do you think, detonation?

    Great seeing the detail on these small rotaries keep it up.
    Thanks mate. Yes that's a good question, i had another look at the housing that port on the left of the chip is the exhaust outlet. Need to do some research on this.

  14. #14
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    193

    Default

    I finally got most of the new parts from the US to start the rebuild. I can now start rebuilding the first engine, also been experimenting on machining up a adapter flange for the E crank shaft seal. i can get seals here in AUS for $5 The original seals are $55 USD. I'll see if i can find a smaller OD on the seal, like to have a bit more material on the bore.

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  15. #15
    Join Date
    Oct 2016
    Location
    Melbourne
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    193

    Default

    Been busy cleaning all the parts before i start the rebuild. I decided to lap the end plates on my surface plate with 800 grit wet and dry sandpaper.

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