ICC is Independant Components Corporation. They make aftermarket parts for all types of machinery from air and reefer compressors to Alco diesel engines. Be sure to give the exact serial number on the little tag, as it will contain the revision number of the pump, which is important, since the pump has been around since 1920 and has gone through some changes over the years.

ICC parts may be the difference between a viable rebuild or one that is not cost effective. Most likely, if the pump is knocking, there is a worn out wristpin bushing, usually on the second stage. This may also require replacement of the the pin or the piston. Seal wear on the input shaft is quite common on old 325's. An 1 1/2" speedi-sleeve is a quick and easy repair. You can make a quick driver for this by grinding the internal threads out of an 1 1/4" pipe union for the driver, then welding about a foot of pipe (1 1/2") to it to provide clearance to drive it on. There is a blind taper race in the rear bearing carrier that you can remove by welding a zig-zag bead all around the inner surface, then allowing it to cool. You can usually remove it with your fingers afterward. Because this pump uses taper roller bearings, you have to set bearing clearance with shims to achieve proper end play. This is not difficult, but it takes a bit of time. Don't rush this. It may take four or five assembly-dissassembly sessions to get it just right. Another pitfall is the rod end caps. Do not mix these up as the rods will almost certainly bind when they are reassembled. It would be a good idea to hot tank the head and valves, as there is often quite a bit of oil or carbon build up on these parts after a few years. Chemical cleaning of the interstage tube is a good idea too. And remember to replace the interstage safety valve on the cylinder head (60-70 psi) as when it blows, it is telling you that you have compressor valve trouble, not that the safety valve is defective!
Rebuild of the pump is straightforward and can be done in a day by anyone familiar with engine rebuilding who has the proper tools. Quincy 325's are the standard for reciprocating compressors. I would try to save it if I could, you will not find anything better.

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