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    how do you change the oil on the lower unit on a 40 hp mariner

    0  Views: 196 Answers: 1 Posted: 11 years ago

    1 Answer

    Remove the bottom and top drain plugs on gearcase and allow all lube to drain out. The plugs are slotted screws, about the size of a dime. Inspect the condition of the drain plug washers, (the washers may stay on the plug, or in the drain plug hole), and observe the color of the oil. Should the lube have a white, milky appearance, or if straight water drains out, a reseal of gearcase is in order. Fill the gearcase from the bottom hole until it runs out of the top hole. While holding the filler bottle in place, replace the top plug, then quickly install the bottom plug.



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