My 101 likes to sling oil out of the case where the Magneto enters the case. I took the cam cover off and took the mag gear off and there was no seal there. 1 put a small felt washer on the mag shaft and mounted the gear. The gear had a slinger disk spot welded to it so I thought this would work. Well oil is still flying. Walker offers a large felt washer to go on the mag gear but it will not work with the slinger welded to the gear. Should I take the slinger off and use the felt? Or what other options do I have? 

Thanks for your help 

The felt washer is basicly an air filter and also prevents oil from getting out. It is quite important to shield from road dust and water to enter the cam compartment into the engine. It is squashed between the magneto body and cam compartment and about 3-4mm thick and can have roughly the same outer diameter as the mag gear itself. The washer hole is a bit larger than the shaft, no need for it to touch the shaft. The felt quality is not too soft but not so firm that it prevent you from mounting the magneto in proper position.

The part number for the felt washer is different for the 1928-30 engine and 1931 engine. I suspect the later is denser than the former as the crankcase ventilation changed in 1931 when the air tube was transfered to the cam cover. The full crankcase pressure is migrating into the cam compartment in those engines, and as the pressure is supposed to go out the tube instead of through the magneto hole, that's why I think the washer got denser or even tight for those engines.

PS Carl I will try th felt rope also.

Regarding the felt seal, I see that as an antiquated setup at best!  If it does "seal" correctly, all it is doing is keeping dirt out, which is good, and directing crankcase oil vapor into the magneto!  That's fine for the bearings in the mag, but not for the rest of the mag, especially when it makes it's way into the points housing.    I've installed a modern single lip seal into the cam case on my 24 and 31 Chiefs as well as a few X's. I've been running the 24 Chief for 26 years and it works great!  The shoulder on the mag gear is 1.0" od, so polish it up nicely and the seal runs here. Installing the seal in the case will require setting the right side case up in a mill, indicating the center and boring the hole to fit the seal. It's a great set up.  I mentioned this some time ago and George chimed in on my seal idea. He was not a fan because it is virtually impossible to find the exact center of where the mag gear will actually be, after installing the mag and setting the gear lash properly, maybe with a few shims. What I do is find the center of the original hole and work from there. If in the end the gear center is off a bit, it's not a problem, the lip seal can give a bit one way or the other and still seal up perfectly.  I will use my 24 Chief as a tried and true example!  It has worked flawlessly for decades. I did rebuild the engine last spring and replaced the seal, though it looked just fine. Remember too, the mag turns at camshaft speed, which is fairly slow, so it's a low wear seal and well lubricated.