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Overlooked cleaning oil cap.

Geo-TH,In

Geo-TH,In

Well-known Member
I bought my Jubilee 5 years ago, 300 hours. Engine was rebuilt and doesn't use oil. After mowing yard yesterday, I changed oil and filter. I looked inside oil cap and it looked like slime. Took top of cap apart and it looked worse.

Never seen anything like this. What would cause this? There is no blow by coming out the cap. I wonder if this was caused before engine was rebuilt. Next oil change, I'll take it apart.
George
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Common to see, the yellow is emulsified oil/water.

That can be caused by engine running cold, as in missing or stuck open thermostat, or short run times when the engine doesn't get up to temperature long enough to boil off the condensation.

Also remember, the old engines don't have PCV (positive crankcase ventilation),nothing to keep the moisture laden gasses, (a normal byproduct of combustion) moving. So the condensation tends to stay in the engine.

Unless there is a mystery coolant loss, don't be concerned about it. Just be sure the thermostat is working, and try to get it out an work it at operating temperature.
 
Maybe check the breather on the valve/rocker arm cover and see if that is clear or plugged up. Had the cover off of a jubilee last fall(broke valve springs) and couldn't believe the mess that was in there. But that cover was never off in 30+ years. chris
 
Condensation that is common in the Mid-west. I know of a Ford 861 that gets water in the transmission every spring. Is never out side in the rain nor pressured washed. It is condensation. It will get a quart of water in it over the spring months. The owner just loosens the drain plug and the water will follow the threads out.

As for a "fix" just clean it often. Also try not to run the tractor for short trips. Let it warm up completely when your using it. Other than that it is the nature of the beast.
 
Actually I have seen where a guy had the same problem with slime in the cap. He added his own pcv valve to his valve cover and ran a little hose to the pipe from the air cleaner. All of those valves have very low pressure springs and you also need to get one that is ment for whatever position you want to install it. Worked for him.
 
Condensation is something I don't have to worry about here in the desert. With the low humidity here, it will such any water right out of the oil!

The other people have it right; the engine is not running hot enough or you are not working it hard enough.
 
As others have said: Condensation. Common ailment in humid climates. No or low temp thermostat, low load operation or, most likely, short run times can make it worse.
 
I change the oil every 75 hrs. Didn't use it this past winter. Runs warm in summer when mowing, about half way on temp gauge. Thermostat has to be working. I have to allow it to cool down a few minutes after mowing or it's hot enough to diesel. I've never thought of checking it the fill cap which is also the vent cap. The way it works, I have a feeling the previous owner never cleaned it either.

Have to take a look at the farmall C. It's always parked inside. The Farmall C doesn't have a water pump, convection only. Don't think it has a thermostat. Temp gauge never gets off cold, but it runs just fine, summer or winter.
 
Thermostat works just fine. Temp gauge runs in the center summer or winter. I've only owned it for 5 years. I think it has been neglected forever.

Definitely look at it more often. This just didn't happen over night, it was gross looking.
I never thought of even looking at it.
 
If your changing every 75 hours and getting slimey look sludge I would be trying a different oil.
 
I really don't think it my oil is causing the issue, full synthetic shell. I think it was a pre existing condition before I bought the tractor and before the engine was rebuilt.

I could be wrong. Will keep an eye on it. I check the oil before using it. It has never used a drop of oil. I will take a peak at oil fill cap too.
 
For me the jury is still out on using synthetic oil. Tried it in a Chevy Impala with a 3.9 V6 with less than 20,000 miles. When it came for first oil change asked GM dealer what to use and was told synthetic oil. Well the car used 1 quart every 1,000 and after third oil change I went back to conventional oil and it doesn't use a drop between oil changes.
 
I have disappearing coolant in my Chevy pickup and the cap looks like that. There is no exterior leak evident. I think I have the defective plastic intake manifold popular in the late 80's. I just keep a gallon of half and half in the bed and give it a drink every few weeks and keep on trucking. TDF
 
My 1950 Farmall C has no thermostat, no water pump, rarely does the temp gauge move. I changed the oil this spring after it sat all winter. A few drops of condensation came out the drain plug first, the oil was a little milky, and the breather cap had a little white milky foam on it. So yes no thermostat, cold running engine and condensation is a problem in Indiana.

On the other hand, I just drained the oil on Jubilee, no milk, no condensation, no white foamy stuff on breather cap.

I'm convinced the slime was a pre existing condition caused by an old worn out engine, which was rebuilt before I bought it. I'll post back if this ever shows up again. Then I'll be looking for the cause. BYT, I never have to add antifreeze.

Farmall engine was rebuilt before I bought it. Both engines are clean burning, solid
engines that don't use a drop of oil.
 
Your C shouldn't run that cool I would think. Every A I have ever known ran up to temp and stayed there. Mine boils and rumbles after you shut it off but has never gotten hot on me. I wouldn't think thermosyphon engines would circulate unless the water got plenty hot. I thought the C had a water pump like the super A did? Maybe you have an earlier A engine in it? I always wondered if they put in a thermostat once they added a water pump. Surely they did.
 
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