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Oil gray and thin in VAC

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Casekernel

10-14-2005 16:17:21

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Drained the oil in My VAC and it is gray and thinner than normal and smells of gasoline. The engine works fine and does not seem to be running rich. Is it possible that gasoline is not being burnt and getting into the oil? Any remedy? Is this dangerous? Would like to correct this post haste. Comments please.

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Case1950

10-15-2005 20:43:30

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Re: Oil gray and thin in VAC in reply to Casekernel, 10-14-2005 16:17:21

What temperature does your engine run? If it does not get to normal operational temp. (180) it could have unburnt fuel in the oil. If it gets to normal operational temp. it should evaporate any unburned fuel. Grey oil could also be babbit material, from the rod and main bearings.

Case1950

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Walt Davies

10-15-2005 10:21:38

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Re: Oil gray and thin in VAC in reply to Casekernel, 10-14-2005 16:17:21

Sounds like water in the oil to get it grey it usally takes quite abit od water. I say head gasket cleeve O-rings cracked head / Block. I would not take a chance and take the engine clear down and do a major on it to be sure that you get it corrected. You can piece meal it but it will sooner or later need to come clear down so just grit your teeth and do it now. It will save you alot of work and money in the long run.
Or change oil and sell it quick AS/IS. giggle

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old

10-14-2005 19:01:17

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Re: Oil gray and thin in VAC in reply to Casekernel, 10-14-2005 16:17:21

Ok let me guess you don't turn off the gas when you park it right????? ?? Well its a common problem with old tractors that if you don't turn off the gas then gas fills the carb and then slowly get in to the engine and thins out the oil. If it does that much it will eat and engine alive so to speak. Always turn off the gas when you park it and save your $$ and your engine.

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Casekernel

10-16-2005 17:13:27

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Re: Oil gray and thin in VAC in reply to old, 10-14-2005 19:01:17

You're right, I don't shut the gas off because my valve on the sediment bulb leaks when I shut it off. Time for a new one I guess or add an in-line shut off and see if that makes a difference.

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F-I-T

10-14-2005 21:28:52

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Re: Oil gray and thin in VAC in reply to old, 10-14-2005 19:01:17

It's kind of tough for a VAC to fill the crankcase since the carb is about 10 inches below the intake ports. Unless the little brass sintered drain plug is painted over in the carb throat. This is where any condensing fuel can drain out.

Running really rich or one cylinder missing could cause some fuel to get into the oil. But that grayish colr sounds like it could maybe be moisture coupled with the engine not running hot enough. Maybe too frequent runs, not warming up, bad thermostat, etc.

Frank

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Casekernel

10-16-2005 17:22:31

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Re: Oil gray and thin in VAC in reply to F-I-T, 10-14-2005 21:28:52

My temp guage does not work. I have a new one and should put it in. I don't have to add water/antifreeze to tractor--so I doubt that any moisture from that system is the culprit. Could be that it does not run hot enough and moisture builds, but why does the oil smell so much like gasoline? Does seem like the oil level increased over time--level on the dip stick. Is the thermostat in the top radiator hose? Possibly I should replace that. At what temperature should the tractor run?

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Paul f

10-17-2005 05:51:28

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Re: Oil gray and thin in VAC in reply to Casekernel, 10-16-2005 17:22:31

If you don't have a thermostat or it is stuck open you engine will not get warm enough to fully combust the gasoline. (Basically the water vapor created in the combustion process and some of the incoming gas/air vapor mix will condense on the cylinder walls. Washes off the oil coating and gets into crank case. Thermostat is in the upper radiator hose and was available from case dealer. Manual shows 160 as temp for gas 180 for low cost

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F-I-T

10-17-2005 09:52:49

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Re: Oil gray and thin in VAC in reply to Paul f, 10-17-2005 05:51:28

BTW, when I replaced my thermostat in the VAC, I found a Stant brand one at my local parts store. The mounting disk was a bit large, so I trimmed that down slightly so that it would just clear the hose. Then you put a clamp above it to trap it in the hose above the upper pipe outlet. Makes a big difference in these older engines. Like Paul says, you can get quite a bit of condensation without one, and the extra fuel that passes by older rings cannot boil off if kept at a low temp. You need that oil to be hot, and the crankcase oil will be hotter than the coolant, and that is what boils off the moisture and the fuel. If you don't work it very hard, or you have a top notch cooling system, I'd try the higher thermostat first. If you go the cheap route like I did, you can try any number of ranges for $ or $5 a crack, but like I said, I put a 180* in it and it works fine.

Also, check your crankcase breather on the valve cover as well.

Frank

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Casekernel

10-17-2005 19:35:04

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Re: Oil gray and thin in VAC in reply to F-I-T, 10-17-2005 09:52:49

I bought a 160 degree thermostat at Napa, trimmed it and installed it. Had to remove the radiator in order to do that--a bit of a pain. There was no thermostat at all in the hose, so that may explain the condensation and fuel in the oil. Put in new temperature guage and now I have a leak around the wire and ulnion that comes out of the block. Can't get it tight enough to stop it. I wonder if this will eventually stop--otherwise I will have to scrap this one an get another. Anyway thanks to all for the help. Will try it out tomorrow.

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