two cycle gasoline engines in the sense that oil circulating
with the refrigefant (R-12 in thise days) provides primary
lubrication. In addition, return flow from the suction line provides
some cooling.
I don't recognize you compressor. It might or might not
have an oil pump or at least a splash lubrication system.
At the least you would have to fabricate an oil slinger to attach
to the bottom of the connecting rod caps.
Fitting (1) appears to be the discharge king valve
Fitting (2) would be the suction king valve
Fitting (3) is a high pressure tap for controls (when used).
Fitting (4) is unrecognizable
Fitting (5) is the oil fill
Fitting (6) a pressure control tap (when used)
probably a high pressure safety control.
Refrigerant normally enters through the crankcase where it
picks up oil to carry through the cylinders and valves.
Replace the SAE 90-300 refrigerant oil with SAE 5W15
Good luck, but don't expect prolonged service.
Not sure...but I think the inlets and outlets at the side are for a water cooling jacket.
The refrigerants available back then were probably ammonia (was Freon around?) and those cooling fins look pretty undersized. The whole idea of a refrigerant compressor compared to an air compressor is to release the refrigerant to the condenser as cold as possible, so that would make sense to use water because it conducts away compressor heat about 260 times faster than air
So maybe valve 2 is cold water inlet and the higher valve 1, is warm water outlet.
I went to YouTube search with the phrase
Kelvinator twin cylinder compressor
and got some very interesting results - none for Kelvinator though.
You know you are going to have to take the compressor apart and inspect the innards for rust and corrosion and pitting, valve seating and piston clearance etc. You don't know what kind of internal pathways it has for gas or fluid flow. Consider it a rebuild, and video the disassembly and put the videos up on YouTube for others to comment on.
Run it by hand and try to sense if there are undesirable friction points. I would not hook it up to a motor before an internal inspection unless I could run the motor extremely slowly.
I am guessing #5 is a port for an internal oil bath. It sits near the bottom. Machines in those days needed a lot of lubrication. They did not have sealed bearings. The strange valves could be backflow preventers to help reduce back pressure on the internal valves.
#3 looks like it could be a sight hole for the assembly or maintenance mechanic to view through to check operation of valves, and thus plugged during normal operations.
That's the best I can do.
Unlike air compressors, refirigeration compressors do not have oil control rings fitted to the pistons as oil control is not impoertant in the seald system of a fridge as all of the oil is eventually returned to the compressor.
This is a problem with air as you will loose oil and it will contaminate the compressed air, use the wrong oil and your air receiver may become a bomb in waiting.
I just dragged home this great Kelvinator twin cylinder compressor that I'm hoping to turn into an air compressor. The hook-up ports are a bit of a puzzle though. I expected to see one inlet and one outlet per cylinder. And I expeted them to be symmetrical. Instead, it looks like this.
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I'm guessing 1 & 2 are inlets and 3 & 4 are outlets. But what are 5 and 6? Why is 1 at the cylinder top while 2 is at the cylinder bottom? And what are the funny valve-like attachments at 1 & 2?
When I hook it up to a motor the inlets and outlets should become obvious. But a person wonders why they do it the way they do,
Any insights?
