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? about the fit of O-Rings on connections

79vetter on Sun July 03, 2011 10:26 AM User is offline

Year: 1979
Make: chevy
Model: corvette
Refrigerant Type: r-12

I have new HNBR o-rings for the a/c job that I am doing. On the connection from the accumulator to the compressor (hose) I am concerned about the way the o-ring fits in the connection. O-rins size that I have on the male side fits loosely...When I try to install the hose , the O-ring is sitting on the rim of the female side. I would think that the o-ring should go inside of the female side - if this makes sense.
My question how do you know which size o-ring to use when making a connection. Some o-rings sizes will fit loosely - smaller sizes obviously fit tigher.

Here's the male and female sides - shown without O-rings

Edited: Sun July 03, 2011 at 10:47 AM by 79vetter

tomw on Sun July 03, 2011 3:19 PM User is offlineView users profile

The O-ring would sit on the male fitting and stay on the female side of the ridge. The sealing would take place between the ridge -the O-ring- and the female fitting. The male tubing should be a pretty snug fit into the female to assure that it lined up correctly, and the O-ring stayed in place. The O-ring should be trapped such that it will stay in place and be supported by the metal of both fittings. The torque to seal properly is not very much.

simplificate and add lightness

79vetter on Sun July 03, 2011 5:59 PM User is offline

thanks for the reply - let me ask this in a different way so its clear to me:

when installing an o-ring on the male side, does the correct o-ring usually need to be stretched out (smaller than the fitting) in order to be slid onto the fitting - or is the correct size a gentle fit with no streching? I have different sizes and thicknesses in my o-ring kit from o'reilly's. - so I am unsure if I should use a smaller size o-ring that stretches when installing but is tight onto the fittting.

chris142 on Sun July 03, 2011 9:45 PM User is offline

Slightly stretched

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