Just picked up 32 of these cheap on Marketplace. They list R12 as the main ingredient. Anyone know what the percentage of R12 vs oil is in these?
Gunk R12 oil charge
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That's mostly just a oil charge. The old original compressors used mineral oil I think. Probably just enough R 12 to put 4 oz. of oil into the compressor.
R413
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You really need to know how much oil is in there. You don’t want too much oil. They don’t tell you on the can? Seems odd.
you can remove The oil pan on the compressor and clean it out. Good thing to do after 40-50-60 years. Specs in the FSM for oil capacity.
you can remove The oil pan on the compressor and clean it out. Good thing to do after 40-50-60 years. Specs in the FSM for oil capacity.
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Demonic
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Sold as band-aids to non-AC pros. The specs for the V2 Compressor are in most service manuals. There's an 1/8" pipe plug on one side, you have to take it out and make your own dipstick. It takes between 6 and 8 oz mineral oil w R12. Use Ester oil if converting to R134a. Do not use PAG oil, it mixes poorly with mineral oil.
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The volume of oil in these "quick charge" can was low....approximately 1-2 oz. Of oil and the balance of the weight was R-12. To add the oil to the system, AFTER attaching the piercing valve to the can, it was INVERTED and both the oil and R12 were added to the system thru the suction charge port. IF your system just needed R-12, keep the can upright to extract just the refrigerant and leave the oil behind. Since R-12 has been outlawed for sometime and not available, you have quite a find. BTW, the total oil charge in a typical R-12 system was only 8-12 oz and the oil circulated with the refrigerant. If too much oil was added, the result was usually higher head pressure or discharge pressure which sometimes caused the relief valve to open and a loss of refrigerant and oil. In a Mopar A/C system, refrigerant was added to obtain a "clear glass" on the receiver/dryer (no foam or bubbles) plus ~ 4 oz additional refrigerant. Just my opinion of course.
BOB RENTON
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Good information. Thanks Bob
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JUST BE CAREFUL IF/WHEN checking the compressor crankcase oil level ALL the system pressure must be relieved B4 removing the pipe plug. If the pressure is not relieved, ALL THE OIL AND REFRIGERANT WILL BE BLASTED IN YOUR FACE. Refer to the FSM for checking and/or adjusting the oil level. ALWAYS use cover goggles when working around a pressurized/working A/C system...... you absolutely DO NOT want refrigerant and oil in your eyes.
BOB RENTON
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oldbee
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For your edification, whenever a condenser or evaporater core was replaced; it was recommended to add 1-2oz. of oil directly to that part. Reason is that some oil was always laying in the bottom and Freon going past would pickup a little and spread thru the system. There's also some oil in bottom of dryer also.
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Thank you.....I am aware.....since the compressor (the old Chrysler Rv-2) has a small oil pump in back of the housing on crankshaft centerline, approximately 65% of the total oil charge moved with the refrigerant the balance remained the compressor to lubricate its internals. The oil movement in the system was due, largely, to differential pressure, with a small amount remaining in low spots including the dryer, as you noted.
BOB RENTON
Thanks for the extra reply's. I completely rebuilt the compressor, added 1 pint of oil in the sump. New lines, dryer, etc so the system was empty. I evac'd the system to 28" and it held for 48 hours. Today I charged it with 50oz's R12 per the manual and then went for a nice cool drive.
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