Articles / Things to do and look for when draining oil from a compressor
It is important to know how much oil one drains out of compressor and how much oil might be left inside it, so that one can determine how much oil to add to the system. Adding to much or too little oil can damage the air conditioning components and result in costly repairs.
A few things to note when draining oil from a compressor:
1) At what ambient was the comp drained at? Hot = more drained oil, Cold = slow/ less oil.
2) Were the ports / caps removed to prevent a vacuum?
3) Was the oil drained and measured from the cylinder head as well as the compressor body?
4) Please remember that depending on the temp at time of draining that approx. 1/2+ oz will remain in the compressor.
5) When the compressor was drained was the compressor crank turned or rotated?
6) How long was the compressor drained?
All of this is part of delivering a professional service to the customer and ensuring that comebacks are minimised. One must be wary to overlook detail in an effort to save some time, as it might cost more than what you would be saving.