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How much to tighten O-ring fittings

Posted: Sat Apr 14, 2018 9:35 am
by Osiris610
How tight should I make automobile O-ring A/C fittings? Is finger-tight enough?

Thanks, Mike Whalen

Re: How much to tighten O-ring fittings

Posted: Sun Apr 15, 2018 6:59 am
by Cusser
I do tighter than finger tight, but not gorilla; so that's not much help.

With an O-ring, the compression forces the O-ring to expand and seal. So I'm saying firm, and when you pull a vacuum or check with bubble solution after refrigerant fill, you should know if you need to tighten a tad more.

Use new refrigeration O-rings only, and oil them with a small amount of refrigeration oil before installing.

Re: How much to tighten O-ring fittings

Posted: Sun Apr 15, 2018 9:58 am
by Osiris610
Just what I needed to know. Thanks!

Re: How much to tighten O-ring fittings

Posted: Mon Apr 16, 2018 4:52 am
by pete_89t2
One other point you need to know about installing O-rings is to never install them dry. Always lube them with whatever compressor oil your AC system uses prior to installation.