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Thread: lower unit vs complete drive

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  1. #1
    Join Date
    Oct 2018

    Default lower unit vs complete drive

    Hi, looking for some advice. Bought a searay 230 a month ago with a 4.3 mercruiser. Was told it overheated and needed an impeller. Removed the lower unit and found the flapper vales( know I need to replace those) and the water pump housing screws on really tight, rounded one head trying to remove. No water in oil when I drained it. Thoughts on replacing just the lower vs the entire drive. Funds are somewhat limited.

  2. #2
    Join Date
    Sep 2015


    I would recommend doing a pressure test and removing the top cover and inspecting the gears in the upper.

    If everything looks good and there wasn't any water in the oil you should be okay with replacing just the lower.


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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.