Oil quantity for a 507 AC compressor

[SC-targa]

I'm swapping out a 507 type compressor for my original York in my 82 911SC.

How much oil does it require?

Thaks,

Jerry

[kuehl]

You should follow the compressor supplier's instructions so you do not void warranty.

However, general procedures:

1) If the system was running R12 in the past it usually used mineral oil. You can mix Ester with mineral oil, PAG does not mix as well. If you are unsure as to what was in there you are best to liquid AC flush the lines, condensers and the evaporator with the TEV removed. You don't flush compressors or driers. Flushing hoses and components, properly, meaning dropping hoses so they drain, taking out the condensers and evap, removing the TEV, is a 10 hour job. If you have stock factory hoses now is the time to think about replacing them instead. After flushing, you need to blow out all the components with air and let them toast in the sun to help evaporate the liquid AC flush solution. Interdynamics A/C Pro Power Clean and Flush, PN CA1, is a decent retail product, 16 oz aerosol can with nice flexible hose and rubber cone; you'd need about 5 cans or more, about $100 nominal retail.

2) A stock 2 condenser rotary piston compressor system typically needs 5-6 ounces in total. If you are starting out 'fresh', meaning all brand new components it's easy. You simply dump out all the oil in the need compressor (it could have 1 to 3 ounces in it); remove the hose connection port caps, if there is a drain nut, remove it, turn the compressor over on top of a clean large can, rotate the outer shaft nut 12 turns clockwise and counterclockwise to allow the pistons to help push the oil out of the open ports, tilt it in a few various directions to help drain. Put the drain plug back on.
You can put the 5-6 oz in the empty compressor, attach the suction hose before you flip it, get all the hoses and fittings snug, and then rotate the compressor shaft 12 turns clockwise to push most of the oil out into the high side so you don't liquid slug the reed valves on startup, or have the oil injected after evacuation.

3) If you are in a situation where you are unsure as to what refrigerant oil was in the system, always best to liquid flush. If you know for sure what kind of refrigerant oil was in the car, you can say:
3 oz for compressor swap,
1 oz for drier replacement.
1 oz for front condenser replacement
1 -2 oz for rear deck lid condenser replacement
1-2 oz for evap replacement.
3 oz for 5 pc hose replacement.
Now, if you add up those numbers its more than 5-6 total system, however, you are best to safely guess for single part component replacements than come up short and lock up a compressor. Worst-case scenario with too much oil is the evaporator becomes soaked with too much oil and you lose heat transfer efficiency.

I would suggest treating the AC system just like your engine, do everything right, don't take short cuts and you will have good reliability (performance is another topic).