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Coating new Orings during r12 to 134a conversion

posted by  rstarkie on  Thu Aug 17 07:00 CST 2017
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last visit: Fri Oct 24 10:14 CST 2014
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Still waiting for the new expansion valve for the 89 240 AC conversion.

I will be replacing as many Orings in the system as possible. Prior to embarking on this conversion I read through many posts on the subject. I remember one that indicated that coating any new Orings with Ester oil was an invitation for leakage. It was recommended that mineral oil be used instead. I can't find any reference to this on additional Google searches.

Anyone care to weigh in on this topic of the proper oil to lube the new Orings with? I am not excited about purchasing a container of mineral oil for the small amount I would need for this task.

Randy








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    Coating new Orings during r12 to 134a conversion

    posted by  Michael Yount on  Thu Aug 17 11:30 CST 2017
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    last visit: Thu Oct 23 20:03 CST 2014
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    Best I can offer is that the oring lube should be compatible with the refrigerant type/system oil being used.








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      Coating new Orings during r12 to 134a conversion

      uid 27's pic
      posted by  Art Benstein on  Thu Aug 17 12:21 CST 2017
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      last visit: Fri Oct 17 20:10 CST 2014
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      I didn't know about this recommendation to use mineral oil on O rings where HCFC-compatible oil (PAG, Ester) would be used, but a quick search "auto ac o ring lubricant" resulted in this #1 result.

      http://www.aircondition.com/tech/questions/69/What-Oil-to-use-on-O-rings%3F

      "When replacing A/C system O-rings, it's always recommended to lubricate all O-rings with clean 525 viscosity mineral oil. Oil on the O-ring surface helps protect the O-ring during the assembly of fittings. The use of PAG and Ester oils are not recommended for this purpose. Many PAG and Ester oils attract moisture, which is said to promote corrosion at the fitting. ..."

      Pull up the link to read the rest, with comments on Nylog and Krytox.

      I've just wet them with silicone grease in the past, but I'm not a good example to follow -- my cars all leak. :)
      --
      Art Benstein near Baltimore

      "No news is good news until you need to know the news" -Tonya Stevens







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