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Thread: Mercruiser alpha one serial number for ratio

  1. #1
    Join Date
    Sep 2018

    Default Mercruiser alpha one serial number for ratio

    Hi guys new too site. I have two legs. What are the ratio motor 5673854. Leg 603782 bell 5697113 and a spare leg 5715701

  2. #2
    Join Date
    Nov 2006


    I'm sorry, we are unable to look up Mercruiser serial numbers that old. We can only look them up from when they started using a letter in them. I can put a 0A in front and it tells me its an MC1, but that's it. I would suggest pulling the top cap and counting the teeth to figure out the ratio.


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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.