Ac oil
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Intermediate
Joined: Apr 2022
Posts: 47
Likes: 13
Ac oil
iHI-EVERY ONE that time again HOT 1970 small block I upgraded to the new stuff new every thing except compressor and hoses so it holds vacuum GREAT now do I need to take my compressor off and put 6oz of oil in it plus how do you put 1oz in the dryer and every thing else there are no moving parts in them.how do the ac shops do it I'm sure they don't take the compressor out I have a good vacuum that has no leak so I have to take it all apart 
thanks bob
thanks bob
Le Mans Master
Joined: Jun 2019
Posts: 7,658
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From: Indiana
Add the oil while you had connections apart, not difficult to remove again at least the ones you can get at. Use new o rings and lube. Move compressor by hand to make sure oil does not lock it up before running and not adding all oil in it. While compressor off assume you emptied oil and cycled new oil if different (mineral oil r12) a few times.
i like vacuum overnight or compressed air 100psi then vacuum to check for leaks. If leaking compressed air allows bubble detection.
i like vacuum overnight or compressed air 100psi then vacuum to check for leaks. If leaking compressed air allows bubble detection.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
There are oil charge cans that are charged with 134a and 1 oz of oil. If you still need all 6 ozs of oil then yes open it up and put oil in. You will have to vacuum it down again after opening it up to get water vapor out.
If you put a lot of the oil in the compressor I would lock up the clutch with 12volts and rotate the compressor to get the oil moved along before you vacuum it down on the same port you just put the oil into. Just don't want to suck it out. Also a good idea so that a slug of oil is not trying to be compressed on initial compressor start up after charging.
IF you're still using old lines, condenser, evaporator, and now 134a I would use the ester oil vs the PAG oil due to residual mineral oil in the old components from R12 use. Oh, I see you changed the condenser and evaporator it appears, but still old hoses. I would still use the ester oil.
If you put a lot of the oil in the compressor I would lock up the clutch with 12volts and rotate the compressor to get the oil moved along before you vacuum it down on the same port you just put the oil into. Just don't want to suck it out. Also a good idea so that a slug of oil is not trying to be compressed on initial compressor start up after charging.
IF you're still using old lines, condenser, evaporator, and now 134a I would use the ester oil vs the PAG oil due to residual mineral oil in the old components from R12 use. Oh, I see you changed the condenser and evaporator it appears, but still old hoses. I would still use the ester oil.
Thread Starter
Intermediate
Joined: Apr 2022
Posts: 47
Likes: 13
HI REELAV8R OR ANYBODY that want to chime in.i really don't know the correct size for the ac lines gasket is there a chart that will help me pick out the correct size so I don't guess at it. I took off the compressor and put in 6oz of oil have to replace tomorrow so I plug the lines because I don't know how long to keep the dryer un plug THANKS FOR ALL THE HELP BOB
