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  1. #1

    Default Difference between Alpha 1, Gen 1 and Gen 2

    I just got a 1979 SeaRay SRV-240 in fantastic condition, and it is only the second I/O I have had. Mostly I have had outboards. The original outdrive was upgraded about 7-8 years ago to an Alpha 1, but I am not sure if it is Gen 1 or Gen 2.

    What are the differences/distinctions, because I need to slap the correct aluminum anode kit on it before I put it in a slip.

    Also, I am going to be slipping it in salt water; other than new aluminum anodes, what can I do to protect the outdrive and the stainless steel prop from galvanic corrosion ?

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: Difference between Alpha 1, Gen 1 and Gen 2

    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  3. #3

    Default Re: Difference between Alpha 1, Gen 1 and Gen 2

    Thanks, Don. It appears that my 1979 Mercruiser had an Alpha 1, Gen 1 installed to replace the previous outdrive.
    The transom assembly has a very faint serial number which appears to be 5995076; does this make it a 470 or 485 ?

    The two bellows visible on the starboard side appear to be in excellent condition. On the port side, however, there is a hose hanging inside the gap between the lower unit and the gimble housing. The hose has a hoseclamp on it, so I assume it is supposed to go somewhere. Any ideas ? The boat is freshwater cooled, and there is a seacock with a through-hull fitting taking water in though the bottom, so I do not think it is part of the cooling system from the lower unit.

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