Oil Leak

Discussion in 'Outboard Maintenance' started by bmann420, Aug 11, 2009.

  1. bmann420

    bmann420 Well-Known Member

    I have a 2003 merc 15hp, 2 stroke and ran it on Sunday. Yesterday I noticed a pool of oil below the lower unit on the ground with some oil on the prop blade & lower skeg.

    Any suggestion of what to look at?
  2. Brett

    Brett > PRO STAFF <

    Pictures are wonderful things.  ;)

    Could be unburnt 2 stroke mix draining from the exhaust housing.
    Could be lower unit lube.

    At idle speeds a 2 stroke leaves as much as 40 percent of its fuel mix unburnt,
    and blows it out of the exhaust port. This coats the inside of the exhaust housing
    then trickles out after the engine has been put away.

  3. bmann420

    bmann420 Well-Known Member

    Dang Brett....once again you are a wealth of knowledge.

    I did flush the motor for 5 - 10 minutes at idle speed and than left the motor in the same position. I had no idea so much oil was unburnt when running the motor at idle.

    Thank you sir!!!!!! I truly appreciate all of your assistance.
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