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Trying to identify the model of this drive unit and transom assembly

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  • Trying to identify the model of this drive unit and transom assembly

    This Mercruiser engine and drive unit are in an abandoned 1985 Sea Ray Seville. I've found 4 serial numbers so far:

    The boat- A29268585
    The engine- A369532
    The transom- A(cant read, maybe a 5)76328
    The drive unit- A389106

    I can't seem to match the drive unit or transom assembly serial numbers with any specific models I've found online.
    It would be great if someone could help me identify the model of drive unit and transom assembly, so I can start doing more research before going about restoring this boat.

    Link to some pictures- https://imgur.com/a/N3l8TIi

    Thanks

  • #2
    Drive is an alpha 1 R or MR type gear ratio 1.98-1 , motor is the 4 cyl inline gm 120-140 hp
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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    • #3
      Originally posted by Bt Doctur View Post
      Drive is an alpha 1 R or MR type gear ratio 1.98-1 , motor is the 4 cyl inline gm 120-140 hp
      Are there any visual/physical differences between the R and MR?

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      • #4
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        From memory the R used the MC1 water pump base and the MR uses the newer type. The drive change was the way the upper driveshaft bearing is installed and pinion end play set
        NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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