Oil leak from alpha 1 driveshaft

Discussion in 'Sterndrives' started by eman, Jun 2, 2007.

  1. eman
    Joined: Jun 2007
    Posts: 1
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    Location: Vancouver Canada

    eman New Member

    Just puchased a 2000 bayliner with the merc 4.3 w/ Alpha One leg. After running the boat for a few weekends I noticed that the gear oil was leaking out of a small drain hole on the lower unit housing on the opposite side of the drain plug(slow leak). I removed the lower unit to check the seals in the shift shaft and to replace the impeller and water pump gaskets. When I had the water pump cover off I noticed that oil was slowly dripping out of the driveshaft into the water pump. Does this mean I need to fix the drive shaft seals or is this normal?? Do the impeller gaskets stop this leak?
  2. marshmat
    Joined: Apr 2005
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    Location: Ontario

    marshmat Senior Member

    I'm pretty sure the Alpha is designed NOT to leak oil all over the place. It would seem to be a safe bet you have a failed seal somewhere; the question is exactly which seal is faulty and how much damage the leak did before you caught it.
  3. krush
    Joined: Jun 2007
    Posts: 11
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    Location: VA

    krush Junior Member

    Sounds like oil is leaking into the exhaust galley. It's most likely either the seal in the upper unit taht fits around the vertical driveshaft (the one u see when u pull the lower unit off that has the water pump on it) or it's leaking around the water pump housing.
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