Leaking lower unit

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Posted by Mike F ( on October 06, 2005 at 07:09:54:

I have a 1990 50HP Johnson that suddenly has a dark black/gray oily sludge coming out of the exhaust and in the front of the prop when the motor is operated. I have checked the lower unit gear lube and it does not contain any water or other contaminants. After stopping the motor, I continue to get a little dripping of the substance just in front of the prop hub.
I've been told that it might be unburnt oil/gas mixture, but I'm not really sure if this is the problem or not. Is there some type of seal around the front of the prop that could be leaking?
Any suggestions would be appreciated.
Thank you

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