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jjrbus
User
Jun 20, 2015, 8:16 AM
Post #1 of 7
(1833 views)
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Adding oil
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93 Toyota pickup with V6, converting to 134A. Every piece of my old system has been replaced except the liquid lines which will be flushed. So I am starting with zero oil in the system
The 93 Toyota pickup with R12 calls for 7oz of mineral oil. The 94 model with 134A that has all the same part numbers as the 93 calls for 7oz of PAG 46 oil. So it looks like i need 7oz of oil.
My question is where to put the oil, I find reference to put more oil into the vacuum line before the compressor than in the compressor. How much is more? When I install the compressor how much should be in it?
I see nothing about adding oil to the evaporator?
There is reference to adding oil up to 2oz to the receiver/dryer. There are 2 holes in the dryer, which hole, does it make any difference?
Obviously I do not know what I am doing so any input is greatly appreciated on this. Jim
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 20, 2015, 9:38 AM
Post #2 of 7
(1824 views)
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Re: Adding oil
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You want to distribute that oil charge throughout the system. I'd say put 4 oz in the compressor. Then add 2 oz to the receiver and 1 oz to the evaporator.
When you get it all together and ready to turn it on for the first time, rotate the compressor drive plate ten turns. This keeps the oil from slugging the compressor when you first turn it on.
Doesn't make any difference which hole you use in the drier.
If the new compressor has oil in it from the manufacturer, drain the oil out of it before you add 4 oz of PAG.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 20, 2015, 9:40 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 20, 2015, 11:32 AM
Post #3 of 7
(1814 views)
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Re: Adding oil
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Trying to pour oil into a dryer can be a pain and it may puddle in the bottom. I would just suck the last 2 or 3 into the low service port while it's under vacuum, unless that port is on the compressor. If it is, then go back to pouring it into the dryer. I agree with the 4 ounces in the compressor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jun 20, 2015, 11:32 AM)
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jjrbus
User
Jun 20, 2015, 2:50 PM
Post #4 of 7
(1805 views)
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Re: Adding oil
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Thanks for the quick responses. Would I need an oil injector to add the PAG to the low service port under vacuum?
I have noticed as I take this apart, there is no oil in the system, none, not a drop. I turned the compressor upside down and turned it, left it setting, no oil! I turned the receiver upside down in a cup left it all day, not a drop of oil came out.
If I had just added refrigerant and turned on the AC would the compressor have quickly burned out?
Would an AC pro have known this and added oil??
Expiring minds need to know. Jim
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 20, 2015, 3:05 PM
Post #5 of 7
(1799 views)
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Re: Adding oil
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You could draw some in using the low side hose from a set of gauges by disconnecting the hose from the gauges and submerging that end of the hose in a bottle of oil and then open the service port valve until it draws the correct amount of oil. Be sure to vacuum the system an addition few minutes after that to remove any air that entered with the oil.
I automatically add a couple ounces of oil to anything I recharge.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 20, 2015, 3:35 PM
Post #6 of 7
(1797 views)
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Re: Adding oil
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Quote">>The 94 model with 134A that has all the same part numbers as the 93 calls for 7oz of PAG 46 oil.<<"
Several vehicles simply pre retrofitted their A/C with almost no changes in the parts as they were good enough with either till they perfected the optimal efficiency of parts for what would become the standard, which is the lesser efficient 134a but as close as was practical if a change was to be.
Oil would have to be different type but does the same. When all is known empty such as this you do want fast oiling of the compressor. Same basic suggestions as said I just add that you want more "upstream" of compressor than "downstream" which has to complete the loop to get back to compressor. No lube for too long which isn't long can be a disaster,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 8, 2015, 3:01 PM
Post #7 of 7
(1683 views)
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Re: Adding oil
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Thread closed as continues on this page:
http://autoforums.carjunky.com/...s_F8/Update_P173855/
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 8, 2015, 3:01 PM)
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