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Compressor new seal lubrication type?

bearing01 on Fri June 27, 2008 12:34 PM User is offline

Hey all,

I'm putting new seals and gaskets in a Bosch-Behr wing cell vane type compressor.

I have read that you shouldn't put PAG on O-rings when installing fittings. My books say to use "regular refrigerant oil" on O-rings and elsewhere it says to use petroleum based refrigerant oil. The shaft seal is the 2-piece spring loaded seat type. It's an R134a retrofit and I'll be using PAG in the end.

Question: When putting her back together should I use PAG, Mineral oil, or something else like Nylog on all the compressor O-rings and seals?

TRB on Fri June 27, 2008 12:38 PM User is offlineView users profile

Nylog is fine of you have it. Otherwise mineral oil.

PS: Chick puts Nylog on his corn flakes. I personally think that's a little much.

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GM Tech on Fri June 27, 2008 12:55 PM User is offline

Pag oil attracts moisture- don't want to rust up connections

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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