Fluid Leak around Prop

I have a 1990 50HP Johnson outboard that I have a question about.

After cranking it the other day (as I do every month) and running it at idle speed a few minutes (on the trailer with a flush attachment), I noticed a gray color somewhat oily residue coming from the exhaust unit within prop. I shut the engine off and cleaned it up a little. I checked the lower gear case lube and it did not appear to have any foreign debris or water present. Since I was checking the fluid, I went ahead and replaced it with fresh fluid.

Now, a few days later, I notice that I am still having a small amount of very thick oily black/dark gray substance leaking very slowly around the back of the prop even though I have not operated the engine since I have changed the lower gear fluid.

Any idea what could cause this and is it an expensive repair job?

Thanks for the help.
Michael France

It is the unburned gas and oil that collects in the carbon deposits in the center section. This stuff dissolves and drips out. We see it all the time and it is just a mess, if nothing else. Not to worry.




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Mark C.


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