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Author Topic:   Black Oooz
flint99 posted 05-29-2002 12:20 PM ET (US)   Profile for flint99   Send Email to flint99  
Hey all, after running engine I get a small 1/2 teaspoon of black oil drip out of the exhaust..it smell a little like burnt fuel. How serious is this? is it running to rich or something else? Replaced lower unit oil and this is much to black to be the lower unit oil.TIA
James
Tom W Clark posted 05-29-2002 12:47 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
James,

What you are seeing is some unburned oil from the fuel mix. It is normal and nothing to worry about.

Steve Leone posted 05-29-2002 02:38 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
you may be running too rich. are the carbs or carb adjustable? if so have them adjusted or follow the recomendations in the repair manual. sometimes i have come across an outboard with a bad lower crank seal and they will drip excess oil down the exhaust hsng. although this is usually a milky colored snot. what make, model and year are we talking about? steve out.
WantaWhale posted 05-29-2002 04:20 PM ET (US)     Profile for WantaWhale  Send Email to WantaWhale     
James,
Look at a message I posted a day or so ago called "Exxon vs Pennzoil" I had the same thing as you. It never caused me any problems other than making it hard to keep the foot clean. I just switched to Pennzoil and not a drop since. What brand oil are you using?

regards,
Fletch

ratherwhalering posted 05-29-2002 04:52 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
I have a similar problem on a 87 v4 Johnson 90 (VRO). There is a dark brown/black oil leak(s) running from the upper exhaust area under the coweling, on down the engine. I'm using quality oil (quicksilver), but those drips just keep oozing. Compression is good. Any comment or similar experiences is appreciated!
lhg posted 05-29-2002 05:57 PM ET (US)     Profile for lhg    
I believe that heavy black oil dripping out of the prop is usually a result of a too rich carb mixture, as indicated by Steve. I also had the problem, and leaning up the carbs solved it.
Steve Leone posted 05-29-2002 07:55 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
alot of these o.m.c. "fat fours" have that problem. some of the carbs are adjustable, others you need to change the idle jet size either by purchasing a larger diameter jet or drilling them out yourself. if you attemt the latter please be advised that there are calibrated bits available. sometimes you only need to do the bottom carb. check with your tech, steve out. ps an intake leak i.e. bleeder hose(s), leaking gaskets, seals etc can cause a similar problem. a good indication of this is if you`re carbs just wont adjust (won`t do anything to the engine idle, up or down, when you turn them). usually the engine is not running right if this is indeed the culprit. steve out.
ratherwhalering posted 05-29-2002 08:48 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
I had the carbs serviced and tuned a few months ago, and that didn't solve the problem. Apparently there was alot of oil residue from the previous owner, and it should dissapate. It did for a while, but it is now back. Could this be related to the idle being smoother when the tilt is slightly up? I'm kind of getting used to "old smokey" but I don't want to polute the bay, and am getting tired of wiping up the drips before they run down to the water level. The carb bases look good, with no oil dripping. BTW the drips seem to eminate from the front of the engine. Hmmm.
Steve Leone posted 05-29-2002 09:36 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
may be a bad reed valve also. if you like for $32.50 i will completely check you`re engine out for you and give you a diagnosis plus a estimate for parts and labour. i am o.m.c., mercury,mercruiser, and honda certified and have had alot of experience with that peticular outboard. i am in the east bay. shoul i send you my ph#? steve out.
Bigshot posted 05-30-2002 10:09 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Completely normal if run on muffs....but for $32.50, have it checked out. Have never had a 2 stroke that did'nt do it sometimes. Never had one that did it all the time either but I don't run marathons on the muffs either.
Whalerdan posted 05-30-2002 11:59 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
Mine does it every once and awhile. I flush it with ear muffs.
flint99 posted 05-30-2002 03:45 PM ET (US)     Profile for flint99  Send Email to flint99     
Thanks for all the posts. I did have the carbs rebuilt but maybe still running to lean as suggested. I'll check it out.
James
ratherwhalering posted 05-30-2002 05:37 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
Sounds good Steve...I'll e-mail you.
Thanks for all the imput, guys.
--Rob--
Steve Leone posted 05-31-2002 11:35 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
flint99, i believe the term would be "rich" in this situation. steve out
flint99 posted 05-31-2002 11:48 AM ET (US)     Profile for flint99  Send Email to flint99     
Oops, thats what I meant. thanks
James

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