Hi All,

Anybody know off hand how much oil to put into an A6 compressor after rebuilding? I am finding either 2 ounces or 6 ounces out on the web. The A/C system works fine except keep losing freon out of rear housing seal and front seal. I pulled the compressor off, sealed off the system and pulled vacuum down and holding at 28 inches. I am not replacing any other components as the system works fine. Just resealing the compressor and re-installing. I would say approx 2 ounces or so drained out but I do not know how much it has lost over the years. 2 ounces just seems a bit low.

Joe

 

I recently rebuilt my system and fitted a new A6.
The AC shop put 6 oz in.....the first time. The compressor lasted 20 minutes!
We then put in 300ml (10oz) and a new compressor and alls well.
Im sure when you vac it down you remove all the oil so it needs a full charge, consult the manual. Check the oil in the new compressor is compatible with what you top it up with.

 

If I recall (did not just check), the CSM tells you to measure the oil that comes out of the pump when you remove it, and replace it with the same amount.

It has always seemed frustrating that they don't give any more detail, but they don't, so relying on the experience of others is a good idea.

Essentially, replace what came out - if you sucked a lot out when you pulled a vacuum, add more, if you didn't add less (I know that's not very helpful).

- Eric

 

It's difficult to say with a system that's been in service with an oil leak. Measuring what was in the compressor upon removal can give a clue. As the oil circulates with the refrigerant, it is throughout the system. The following unit replacements usually require the addition of oil:
drier: 1 ounce
condenser: 2 ounces
evaporator: 3 ounces
The compressor originally was charged with 10.5 ounces, but often operates with less.
Due to a tendency toward seizure, I usually tend to put more rather than less oil in it. But do not put in more oil than the compressor's crankcase will hold.
Before running the compressor: After installation is complete, turn the compressor by hand, in its usual rotation, about 10 turns. This will clear any oil which may have gotten into the cylinders during handling. Those reed valves are for pumping gas, not liquid.

 

Is the compressor capacity 10.5 oz. if it is full? I will be recharging another car that I have replaced everything with new, clean, dry components. New dryer, new condenser, new evaporator, lines , and when I have broken in the engine, I will buy and install a new A6 and charge the system. I was told that when I buy the new compressor, it will come full of oil, and it will circulate through the system, and I do not add any to the various components.

 

The last time we fitted a new compressor ( I did the install) the installer instructed me to drain the compressor and remove the Thermal expansion valve ( this is the lowest point on my system)and drain the lot. His rational was any oil added will be quantified and will be correct for the gas being used without contamination issues. I was surprised how little came out of the pre filled compressor ( mine has dual belts so the A6 came from a Rolls Royce supplier ).
Hope it helps

 

Update on rebuild. Spent most of the time cleaning off 40+ years of crude then anything else. I found 2 sites that stated the sump holds 6 ounces of oil. Since I did not drain the rest of the system and the pump assembly had some oil in it I added 5 1/2 ounces back in. Put everything back together. Evacuated the system again, turned the compressor buy hand for a while and charged the system. By the time the site glass was clear, nice cold air was coming out of the vents. So far no obvious leaks Thanks everyone for your input!