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  1. December 2nd, 2011, 10:50 PM #1
    Spivy30
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    Default How to winterize 90HP Mercruiser

    Im trying to figure out how to properly winterize a 90hp Mercruiser thats in an old Mark twain. I believe its a 4 cylinder renault motor. I cant find any drains... i only found the one water inlet hose.
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  2. December 2nd, 2011, 11:18 PM #2
    ziggy
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    Default Re: How to winterize 90HP Mercruiser

    check out mercruiser service manual #1 from here. pp 1A-7 has a short blurb on draining along with some pics...
    'Lime Time'
    1975 AristoCraft Nineteen
    Mercruiser 165hp (chevy 250 L6), MC-1 drive
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