Oil bath air cleaner question.

[MiCarl]

You all helped me so well on the touch control question I'll try another one:

I'm catching up the maintenance on my recently acquired Cub and today I pulled the cup off the air cleaner to change the oil (I believe it is a Donaldson). I see there is an inner cup with four holes that the inlet pipe sticks into. The fill line on the cup is at approximately the same level as those holes.

Would I be correct that the inner cup needs to be filled as well as the main cup?

[Slim140]

Yes, oil is in the center as well.

[Eugene]

The inner ring on most oil/air filler caps has openings in the bottom of the inner ring.

You may need to put the cap in the parts washer to fully clean it up, thus letting oil fill the inner ring.

Any way, the cap needs to be filled up to the line on the outside, that includes the inner ring.

[Glen]

Hi,
Below is the 1949 Cub owner's manual, if you don't have one. The experts on here recommend that people read it. It has much info about operation, maintenance, and lubrication. It has pics of how the Cub originally looked. It has a table of contents on page 1.
The manual has info about cleaning the air cleaner.

http://farmallcub.com/rudi_cub/www.clea ... index.html

A change since then is that nowadays they use Case IH Hy-Tran fluid in the Touch Control.

[MiCarl]

Hi,
Below is the 1949 Cub owner's manual, if you don't have one. The experts on here recommend that people read it. It has much info about operation, maintenance, and lubrication. It has pics of how the Cub originally looked. It has a table of contents on page 1.
The manual has info about cleaning the air cleaner.

http://farmallcub.com/rudi_cub/www.clea ... index.html

A change since then is that nowadays they use Case IH Hy-Tran fluid in the Touch Control.

I have the manual and read it frontward and backward. I didn't see anything about the inner ring. My suspicion is that in the '40s and '50s it was common knowledge what to do......

[Glen]

Hi,
Glad you have the manual.

[Jim Becker]

I think you will find that by the time you get the outer part of the cup full to the mark, the inner part will be full too. (I think that happens with either version of the air cleaner.)

[MiCarl]

I think you will find that by the time you get the outer part of the cup full to the mark, the inner part will be full too. (I think that happens with either version of the air cleaner.)

The stamped ring in the cup is about 1/4" tall and above it is stamped "fill line". The holes are about the same height as the ring so if you fill to the bottom of the ring it won't run into the inner part - go to the top of the ring and the center will fill too. For that matter, even filled to the bottom of the ring some would slosh into the center the minute the tractor wasn't level.

My suspicion was that it gets filled to the top of the ring, and the center cup too. When the tractor runs the oil will be pulled out of the center and raise the level in the outer cup. Then the intake air has to bubble through the oil - creating a mist that coats the actual element.

Then when the tractor is shut off most of the oil will drain off the element - washing dirt down to settle into the bottom of the cup.

[ntrenn]

When i cleaned mine after 40 years of use, i found about a half inch of sludge in the bottom....when you clean that out i think you will find them connected by cross holes at the bottom. That comment about knowing 'back then'. One of the best improvements to engine wear is the replacement of the oil bath air cleaner with pleated paper.....

[MiCarl]

No cross holes at the bottom. Filled it to the "top" fill line which fills the center cup. Tractor runs just fine so I guess that's not too much.

I did have to fiddle with the idle mixture. When I took the cup off it was less than 1/2 full so no air moving through the oil. With the extra restriction it was a bit rich.

[Eugene]

Remove and clean the air cleaner, the entire air cleaner. How to do that is on this site.

The holes in the bottom of the inner ring are frequently filled up with crud. Place air cleaner cap in parts washer and scrub up.

[MiCarl]

Remove and clean the air cleaner, the entire air cleaner. How to do that is on this site.

The holes in the bottom of the inner ring are frequently filled up with crud. Place air cleaner cap in parts washer and scrub up.

Cleaned the whole thing. Cup is just like this one on ebay:



No holes at the bottom.

[masont]

Just picked up our first Cub project to restore for 3Yr old grandson. Wondering the purpose of the oil line from the block to the oil bath air filter??

[MiCarl]

Just picked up our first Cub project to restore for 3Yr old grandson. Wondering the purpose of the oil line from the block to the oil bath air filter??

Since there is no return line I suspect it's just crankcase ventilation. Re-burn any blow by rather than vent it to the atmosphere.

[Don McCombs]

Since there is no return line I suspect it's just crankcase ventilation. Re-burn any blow by rather than vent it to the atmosphere.

This is correct. Now is a good time to remove it, and check that it is not blocked. Clean it with carb cleaner. If it's totally blocked, run a wire through it, then clean.