Oil seals for a No 24 front cable control unit

Currently in the middle of a rebuild of a No 24 CCU. I had to take out the inner clutch drum to resurface the inner pressure plate, and there were 2 cast steel oil rings around the drum that fell apart once it came out. Very reminiscent of an engine piston ring. Have never seen anything like them on an older Cat. The parts manual says 1A446/1A0446, completely non existent online. Anyone know of a replacement part, or am I the only person dumb enough to rebuild one of these?

I wonder if you could find some actual piston rings that are close to the size you need. Even used one may work.

Are they cast iron? You may be able to find someone with a lathe that could turn out some from steel preferably , then cut them open and carefully install without bending .

Might try some of these too:

https://www.mcmaster.com/products/snap-rings/high-load-spiral-external-retaining-rings~~/

Yeah I am looking through some piston ring catalogs right now and hoping to find something close. This shaft rotates within another shaft so the concern is using the wrong material will wear grooves into the other shaft and prevent it from sealing. I am assuming that grey iron was what they were using, but who knows. Would also be nice if I had one that wasn't broken so I could know what kind of gap to shoot for.

Here's some specs and pictures, used on air compressors as well as the #24

https://www.wbparts.com/rfq/4310-00-270-3482.html

https://avspare.com/caterpillar/ring/1a0446/

PNW could you convert to the newer teflon and backing ring? I know the teflon is pretty darn hard and have pressure side and non pressure sides (oil direction), the O ring would help keep pressure out wards to other seal face and would take longer to wear a groove in seal face and keep groove area in good condition, obviously easier to fit and will stretch and retract over time after fitting, maybe cast was used as lower pressure and lower wear factors on both groove and seal face, as a thought

I went through just about every ring catalog I could find and finally found one that looks like it should fit and is the right material, $25 each:

Allegheny Website

This is such a weird application, the inner shaft doesn't move outward or inward in relation to the outer shaft, so the rings will be pegged inside the outside shaft and the inner shaft should hopefully be floating on them. I guess they are just supposed to wick away any gear oil that finds it's way in between them. I'll take some pictures when I get it all back together.

Busso: I thought about that but I think the rings add a bit of structure to the whole assembly and iron is probably the thing to use.