98 Johnson 9.9 leak at prop

Discussion in 'Outboard Maintenance' started by htf2034, Jul 10, 2009.

  1. htf2034

    htf2034 I Love microskiff.com!

    5
    0
    326
    Bought a 98 Johnson 9.9 that looks like new, barely used.  After running a little rough at first, now runs great, but leaking a greyish sludge from prop.  Mechanic did pressure test-fine, compression test-good, and cleaned out carburetor but leak continues.  Also checked gear lube which was a little dark but found no water.  Leak is a slow drip that smells like gasoline.  Any engine pros out there have any ideas?
     
  2. Brett

    Brett > PRO STAFF <

    Unburnt 2 stroke oil and gasoline mixed with carbon
       deposited on the walls of the exhaust housing
    continues to trickle down after the engine is put away

                 normal with a 2 stroke motor
     

  3. mark_gardner

    mark_gardner I Love microskiff.com!

    thats what it sounds like to me also :cool:
     
  4. oldschool

    oldschool &quot;Old School&quot;  '67 Wellcraft

    127
    0
    341
    Light grey sludge means lower unit leak. Could be really bad if not fixed quick.... BEEN THERE....
     
  5. noeettica

    noeettica Well-Known Member

    3,675
    106
    2,268
    Keep an eye on the gear lube if It aint yellow Dont sweat it ....

    Dave
     
  6. Tom_C

    Tom_C Well-Known Member

    721
    1
    391
    About a half dollar size spot under your motor is normal.

    If it looks like this then you have a problem.


    [​IMG]
     
  7. htf2034

    htf2034 I Love microskiff.com!

    5
    0
    326
    It definitely doesn't look like that. It's a slight drip and sounds like from the replies it may not be anything to worry about. Thanks for all the help from a newbie boat owner.

    Taylor
     
  8. Kemo

    Kemo The world is flat....and shallow.

    455
    0
    391
    If someone before you ran something through it to "de-carbonize" it, it will do this for the next 8 - 15 uses. If that's the case, it's normal. Any way you can find out if that was done?

    Kemo :cool:
     
  9. htf2034

    htf2034 I Love microskiff.com!

    5
    0
    326
    That's exactly what the mechanic said when I picked it up yesterday. He said it looks and runs like it's new and the best thing is probably just to run it like crazy and let the exhaust system clean all that out. That was good news as I had read elsewhere that grey fluid meant lower unit problem. Thanks again for the replies.