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Lower unit oil change on 1995 40 hp johnson

4 screws in total , but no real indication which ones are for draing or venting or filling,pumping

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Howdy, John here, I have a 40hp 1995 Johnson, of the 4 screws, two are screws and two are plugs, the top one is the vent and the bottom one is drain and fill. Oil is forced in from the bottom and out the top to prevent air pockets.
After filling, install the top plug first, then remove the filling device and install the plug.

You can get an online(pdf) service manual subscription from

Posted on Mar 28, 2009


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Posted on Jan 02, 2017


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