Need old Kellogg compressor help

Thanks in advance.

Displacement of a cylinder is found by:

(Pi/4) x Diameter Squared x Stroke.

Remember, 1hp for every 10 cubic inches of first stage displacement.

The ring you refer to is the oiler ring. It runs in the groove machined into the crankshaft ( a sharp V groove, near the very center of the crankshaft). If your pump has the split back crankcase, you have to put the ring onto the crankshaft, lift it in through the back of the crankcase, twist the metal ring so it slides into the guide cast onto the bottom of the crankcase, then let it hang straight down again. Not easy to do when you are holding a built crankshaft with rods and pistons flopping about.

The guide on the crankcase bottom is not easy to describe, but from the Kelloggs I have worked on, it is two cast posts, with a third post with a hook on the end, in between the other two. This hook prevents the ring from riding out of the top as the crank spins. This ring carries oil up to the crankshaft, which has little holes drilled into the nook of the groove machined on it. The oil runs into these holes and centrifugal force creates oil pressure which lubricates the bottom end. This pump probably has needle wrist pin bearings, which was a nice feature of Kelloggs and allieviated the wrist pin problems so common to compressors.

Beware that the split back crankcase was easy to strip, and even crack, when torquing down the bolts in the rear bearing carrier. If your crank has Timken taper bearings, be sure to properly shim the carrier for correct bearing end play as well. Kelloggs lasted a long time, but the quality of the cast iron in them resembled cheese and was extremely easy to strip threads in.

Don't know about the valves. Probably could cross reference them to another Kellogg. See if the name Hoerbiger is evident on any of them. Hoerbiger may still have the bits. If them are the cast iron bodied ones with the three oval holes in them, I would be confident of finding parts at a Kellogg dealer, if you bring in samples to cross reference them to.

Kellogs are from the good old days when manufacturers solved structural problems by adding more cast iron. I guess there was a lot of surplus military equipment to get rid of.

Wow! Thanks for the detailed reply. My compressor is a small, one-stage unit. It only has a single(long)crankshaft bearing on one side - in fact, it really looks like 1/2 a standard crankshaft. The oil ring mount looks like a small piece of stamped steel, with a screw hole in the center, and a small hole in each end. The holes in the ends are worn through; the screw in the center holds the piece in to the casting. The ring is not vertical, it is at about a 20 degree angle - does this sound correct/typical?

On the valve, there is no name evident on them, and I beleive I will have to destroy them to get them out. Is this style of round, press-in valve common? I don't mind using an "incorrect" valve if necessary, I just want it to work & be serviceable.

Thanks again.