H oil bath air cleaner update

Mr. Mayor · Jul 21, 2009

It appears that the weight of the oil in the cup is critical. I changed from 5w30 to straight 30wt. and the dripping seems to have stopped.

Janicholson · Jul 21, 2009

I'm glad. I made a mess once with light oil in a cleaner cup. Engine intake pulses are actual and capable of moving oil against logical processes. Jim

Owen Aaland · Jul 21, 2009

(quoted from post at 04:44:34 07/21/09) I'm glad. I made a mess once with light oil in a cleaner cup. Engine intake pulses are actual and capable of moving oil against logical processes. Jim

In order to get the intake valve open quickly enough for optimum performance the intake opens a little before TDC. There is still some residual exhaust pressure left in the cylinder at this point in the cycle. There also is a vacuum in the intake manifold so that as the intake opens some of the exhaust gases push into the intake system. Under light load there is enough vacuum in the manifold that it probably is not able to move the oil up the pipe. Under full load there is very little vacuum and also there is a lot more exhaust pressure so that is most likely when the oil is thrown up the pipe.

mattofvinings · Jul 21, 2009

Just me and not picking a fight but you could not pay me to run a 5W30 in these engines unless I was tractoring at the south pole.

No roller valvetrain is a big reason.

Roger46 · Jul 21, 2009

I would like to know why I have never had that problem with my Super H when I have used multigrade oil in my air cleaner for 30 years. I also use it in all my other tractors with oil bath air cleaners and have never seen that happen. The only time I get oil coming back is when I stop the tractor and it diesels and runs backwards. I also dispute that there is any reverse air flow when the tractor is running even at low speed. Sure the flow is somewhat pulsing, but not reversing. Roger

Janicholson · Jul 21, 2009

Well stated Owen. Jim

Janicholson · Jul 21, 2009

My guess is that 10w30 is seriously heavier than A 5wt. at ambient temps. The reverse air pulse need not tow the oil, just throw a few drops against the flow successfully lubing the precleaner. I have been there. What Wt multi-vis did you use? JimN

Owen Aaland · Jul 22, 2009

(quoted from post at 17:38:49 07/21/09) I would like to know why I have never had that problem with my Super H when I have used multigrade oil in my air cleaner for 30 years. I also use it in all my other tractors with oil bath air cleaners and have never seen that happen. The only time I get oil coming back is when I stop the tractor and it diesels and runs backwards. I also dispute that there is any reverse air flow when the tractor is running even at low speed. Sure the flow is somewhat pulsing, but not reversing. Roger

When the engine is at idle there should be about 17 inches water column vacuum on the manifold side of the intake valve and probably a couple PSI pressure left in the cylinder. Since the piston has not started down when the intake valve starts to open, which way is the air going to flow?

In the early 1980's I worked on some trucks that were converted to propane. Before they figured out to limit the total spark advance we had a lot of problems with detonation breaking the center electrode out of a spark plug. When that happened you would find one spark plug missing the center electrode and almost always there would be four damaged pistons, two on each side. This "pulsing" was great enough to move that piece of electrode through the intake manifold to all the cylinders that ran off of that plane on the manifold.

H oil bath air cleaner update

Mr. Mayor

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Janicholson

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Owen Aaland

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mattofvinings

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Roger46

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Janicholson

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Janicholson

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Owen Aaland

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