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lower unit leaking out of top drain screw

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  • lower unit leaking out of top drain screw

    2011 f150txr....I changed my lower unit lube as directed in the manual, came back to my boat 3 months later and found a stain running down the lower unit from the top drain screw....I used new gaskets....I snugged both screws being careful not to strip them...I actually re checked tightness and they were a little loose..I am thinking the new gaskets compressed a little over time...I opened the top drain screw and a gush of lube came out with a little burst of air.. after the pressure subsided..I re tightened the top drain screw and checked for leaks the next day....nothing.....I found this really odd... I was worried when I first noticed it that I stripped the drain screw...but they are fine.... I also pumped the lube in thru the bottom drain really slow in order to get all of the air out...anyone ever have this happen?

  • #2
    If oil smells burnt then may have a bearing going bad causing excess friction.
    Regards
    Boats.net
    Yamaha Outboard Parts

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    • #3
      Thanks, but the l/u lube was changed and the boat was stored for the winter....never ran it on the new l/u lube....I think it might have been from the sun warming the l/u and then getting cold at night...temperature fluctuations....of course, that is just a guess...

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