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150 hp, lower Unit Leaking gear oil out vent hole

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  • 150 hp, lower Unit Leaking gear oil out vent hole

    My 2001 150 hp leaks gear oil out the vent hole. It leaks out the hole adjacent to the oil screw fill hole. Freshly filled 25 hours ago. This occurs after running the engine on the garden hose, and in gear at low idle. Any suggestions on how to stop the gear oil from leaking out this vent hole would be geatly appreciated!
    Thanx

  • #2
    Re: 150 hp, lower Unit Leaking gear oil out vent hole

    Remove lower unit.
    Drain gear lube.
    Then do a pressure check of the lower unit and determine what is leaking.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

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    • #3
      Re: 150 hp, lower Unit Leaking gear oil out vent hole

      What is pictured is a 1977 johnsosn 85 hp, I like to start it once a week to keep the batteries & everything else in check When running w/the earmuffs everything seems ok, when I stop the motor & the water drains a mix of oil & water seep out of the weephole(top) as shown in pic, I recently had the water pump replaced, and lower unit oil replaced, have only had it out twice since then...Is this going to be a seriuos problem?? any help would greatly be appreciated....
      Attached Files

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      • #4
        Re: 150 hp, lower Unit Leaking gear oil out vent hole

        There are NO vent holes in the lower unit. The oil would leak out ( and water leak in)under operating conditions. That is some other vent hole. The oil is likely unburnt fuel.

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        • #5
          Re: 150 hp, lower Unit Leaking gear oil out vent hole

          On both engines mentioned above, the vent holes are there to drain any trapped water. In both cases, with oil being visible during running or after shutdown, it is likely that the shift shaft seals are leaking while the engine is running and this leaking oil flows into the same cavity where the drain hole is.

          A second possibility is the Main Drive shaft oil seals under the water pump.

          If you drop the lower units after running you should be able to see water and oil mix remaining in the deep cavity surrounding the shift shaft and you will probably see an oily residue on top of the shift shaft seal holder.

          You can pressure test them in a water tank to see for sure which one is leaking.

          carholme

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          • #6
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            Re: 150 hp, lower Unit Leaking gear oil out vent hole

            Thanx Guys, i just had the lower unit oil changed, and water pump kit changed, before then I had no problems, now im leaking, maybe it was not properley re-installed...back to the mechanic, I will update after holidayz......

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