Engine Size: 350
Refrigerant Type: R12
Country of Origin: United States
I'm keeping my A/C unit operating on R12. Before I install the compressor how do I proceed with amineral oil flush so it has the best chance for survival.
Do I just stand it on end to let the old oil out? Put new oil in..rinse and repeat? Seeings how the drain plug is offset, I wont get all the oil out of it that way.
Furthermore, when I fill it up with the new oil, do I pre-measure the amount ( I believe it is 10 oz) and put it in the back? Sorry if this is too basic I'm learning as I go.
Turning the hub of the compressor will help pump some oil out. Use the drain port and the suction & discharge ports including letting it sit ports down. The more times you use fresh oil the better chance you have on removing the oil oil. Drain it flush it twice with intended oil and then fill to capacity is what I would suggest.
I pretty much did what TRB states above when I replaced my '88 Mazda B2200 compressor in 2003. That rebuilt compressor (Air Pro from AMA, by the way) came filled with an ester-type oil (I confirmed that at work in a minute with our FTIR spectrophotometer) and I used mineral oil to flush it a few times, draining and refilling each time. Then I added correct amount and re-installed, then pulled vacuum and added R-12.
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