oil coming out exhaust

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torchred89
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oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 4:11 pm

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I was pushing snow for about a hour the tractor ran fine. When I got done I noticed black oil specks all over hood and exhaust manifold and carb. Evan blew back on head. Tractor is still running good no miss.

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Re: oil coming out exhaust

Postby cub.bub » Mon Mar 02, 2015 5:01 pm

I'm no expert, but have you checked your valve cover? Could be leaking there when running and the fan blowing it back.
If like you say "it's running all right" I would think you'd be running rough and blowing smoke ?
Bruce.

torchred89
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Re: oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 5:19 pm

It's coming out exhaust. It blew about a half quart out in a hour. No gas in oil, No water in oil.

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Re: oil coming out exhaust

Postby Bus Driver » Mon Mar 02, 2015 5:20 pm

Certainly looks like oil. Cannot think at this moment of a test to verify that it is oil. One thought is that the exhaust gases are composed of a significant amount of water in the form of steam. Plus other gases.
No doubt it was cold where the tractor was working. A very long shot is that this could be condensed water with carbon in it. But not highly likely.
In my youth, I drove a kerosene burning tractor. After a day of driving without a shirt, my body looked to be heavily freckled from the exhaust droplets. And that was in hot weather.
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torchred89
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Re: oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 5:34 pm

One thought is that the exhaust gases are composed of a significant amount of water in the form of steam. Plus other gases. That's what it looks like. The exhaust doesn't smoke it was just spitting out all that black stuff. The tractor is stored in a heated garage. But it was snowing real hard

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Re: oil coming out exhaust

Postby Wagon19 » Mon Mar 02, 2015 5:44 pm

I had a similar problem a few months ago. The solution was the top of the oil filter cover. The copper washer was loose as well as the oil filter gasket. The Cub ran well until the number 2 plug grounded out due to the amount of oil in the spark plug lead.
Hope this helps :beer:

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Re: oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 6:08 pm

I'm going to look.

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Re: oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 6:17 pm

No! The exhaust pipe is full of burnt oil.

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Re: oil coming out exhaust

Postby Clip » Mon Mar 02, 2015 6:43 pm

Guessing blowby from the rings? What are the compression numbers?

torchred89
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Re: oil coming out exhaust

Postby torchred89 » Mon Mar 02, 2015 6:46 pm

Clip wrote:Guessing blowby from the rings? What are the compression numbers?
I'm going to check that tomorrow. The tractor doesn't have a miss or lack of power

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Re: oil coming out exhaust

Postby Boss Hog » Mon Mar 02, 2015 7:20 pm

maybe too rich on the gas
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Re: oil coming out exhaust

Postby Gary Orr » Mon Mar 02, 2015 9:34 pm

Sticking float or a bad needle valve
GO

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Re: oil coming out exhaust

Postby challenger » Mon Mar 02, 2015 10:25 pm

torchred89 wrote:It's coming out exhaust. It blew about a half quart out in a hour. No gas in oil, No water in oil.


I assume you checked the dip stick and determined that the crankcase was a half quart low and the source of the oil. I say that because the breather cup could be the source if it has gotten water in it.

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Re: oil coming out exhaust

Postby John *.?-!.* cub owner » Tue Mar 03, 2015 10:28 am

If it has actually dumped half a quart of oil out the exhaust in half an hour you have serious engine problems, which would normally result in lots of blue smoke, low power, plug fowling, etc. I am wondering if you are looking at a couple of unrelated things. Black specks on the hood are normal in vertical exhaust tractors, they result from water in exhaust as it warms up picking up pieces of soot stuck to the inside of the muffler and carrying it out to fall on the hood. If they are actually oil drops, they would tend to spread like water drops, not stay as a tiny speck.

The pictures of the oil on the engine reminded me of one I helped out on a couple years ago. The owner did not have an owners manual and had been overfilling the fan on a regular basis. By the time I saw it everything under the hood and from the fan all the way back to the operator platform were solid black from the excess oil in the fan hub and the dirt from the belly mower. After about 10 minutes with the pressure washer he had an entirely different looking tractor. I ran him off a copy of the owners manual before we hauled it back.
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Re: oil coming out exhaust

Postby torchred89 » Tue Mar 03, 2015 12:37 pm

Gary Orr wrote:Sticking float or a bad needle valve
GO

Bingo! You were right. Cleaned carb put back on and no more problems.


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