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Thread: 1993 Sunbird Corsair 205SL 5.7 Chevy conversion to OMC

  1. #1
    Join Date
    Dec 2014
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    11

    Default 1993 Sunbird Corsair 205SL 5.7 Chevy conversion to OMC

    My experience with the conversion was about what I expected. I felt like I was on my own for a few things but again that is what I expected. Most of it was easy. I struggled with the shifting part. Converting my shifter to throw the other direction was easy. I was disappointed by the directions that included the instructions for how to adjust a Mercruiser with all the Mercruiser rigging. This was a huge waste of my time really trying to get the cable to 6 inches in forward. Ha! It boils down to really making sure you have full 3 inches of throw on the bottom cable. and guess what? Suprise right in the middle 1 1/2 inches is neutral. To get my full 3 inches I had to do some filing on my shifter bracket and my cable. They were interfering with each other. Also My spring on the lower swivel bracket was compressed. I had to remove it and expand it a little and reinstall it to make it tighter and better at self centering. Speaking of the ESA I left mine hooked up like factory and when idling at 600 it shifts out of gear flawlessly. Call me stupid but if the cable jams the Mercruiser way the engine will die, not stutter and that could be as dangerous as not pulling out of gear. I have been dead in the water before with big waves and it aint fun

    I was pleasantly suprised how easy it was to make a bracket to get my trim gauge working again I'll post some photos at the end of the bracket and some photos later of the filing work i did to get the shifter to throw. To me the trim bracket should be part of the conversion. it would be very simple to mass produce and make it available to everyone or add it as an option.

    Handling is a little different. The drive overall seems smaller than the OMC and maybe shallower so my prop breaks the surface earlier than the old drive. So the prop breaks loose when turning hard. This was particularly troublesome the first run out when I had no trim indicator.

    I got a great 4 blade prop 17 pitch that hooks up great, and while we are talking about it, Those that say an OMC prop will fit are wrong. An OEM OMC prop will fit the splines but its impossible to get the nut on and and locked.

    I did add a remote oil reservoir I bought on ebay. I had to drill a hole in the transom and the hose fits on the side of the drive where a plug usually goes.

    20150411_122731.jpg20150411_124215.jpg20150411_130942.jpg
    Last edited by pecothern; 04-14-2015 at 03:01 PM. Reason: proper english

  2. #2
    Join Date
    Dec 2014
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    11

    Default

    Here is a photo of the oil reservoir I bought on ebay. I'm happy with it. I had to drill a hole in the transom but no big deal. I could not imagine trying to get an oil hose into the same tube the shifter cable was in. seioil res.jpg

  3. #3
    Join Date
    Dec 2014
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    Yall may have noticed I have no exhaust bellows. I may have had more difficulty mounting the trim bracket if there was a bellows in the way. Three cheers for Thru hull exhaust !!!

  4. #4
    Join Date
    Dec 2014
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    Default

    a few more photos 1 of my boat. a couple showing the filing I had to do on the cable and shift bracket. one of the engine compartment where I mounted the remote resevoir.

    Attachment 139Attachment 140Attachment 141Attachment 142

  5. #5
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    Dec 2014
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    11

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Sterndrive Engineering, Inc. (SEI) manufactures a stern drive designed to replace Mercury Marine's MerCruiserŽ Alpha OneŽ, R, MR, Gen II and Bravo OneŽ stern drives. MerCruiserŽ Alpha One, R, MR, Gen II and Bravo OneŽ are trademarks of the Brunswick Corporation. SEI has no affiliation with the Brunswick Corporation. Consequently, any warranties governing products and or sold by Brunswick Corporation will not apply to products manufactured and or sold by SEI, or to products damaged due to the operation of an SEI product.