About 80% of the amount of R-12 that was originally "spec'ed". (Sorry, I don't know that figure!)
As you add refrigerant, the system will start to cool.
The large (suction) line leaving the evaporator will be at ambient temp. As you add R-134, the line will eventually start to cool. When this happens, you are getting close to the correct charge. If you continue to add refrigerant, eventually, the suction line will be cool and have condensation all the way to the compressor.
Charge it beyond the condensation getting CLOSE to the compressor, and you risk liquid getting into the compressor and breaking things.
I tend to UNDERCHARGE these sytems a bit, as the compressor is already working harder than originally, since R-134 runs a higher "head pressure" for a given condensor temperature.
I feel that a systeem cooling at perhaps 90% of capacity is better than trying for 100%-plus, and blowing a line or a compressor.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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