72 Corvette POA Valve

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Sailfish95
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72 Corvette POA Valve

Postby Sailfish95 » Sat Mar 23, 2019 11:03 am

I just rebuilt the original AC R12 system on my 72 Corvette. The rebuilt works well and has not leaked any refrigerant in 6 months. The only issue I have, is the bottom connection on the POA valve is oozing oil on the bottom connection 1 1/4" nut. What would cause the fitting to leak oil and not R12, also how tight should this nut be?
Thanks
Ed
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Tim
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Re: 72 Corvette POA Valve

Postby Tim » Sun Mar 24, 2019 1:32 pm

Solidly snug, do not over tight. If you're leaking oil. You will be leaking refrigerant. Something like http://www.ackits.com/lubricant-silicone-o-ring-lube-24139?search=bva may help seal up the connection.
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Sailfish95
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Re: 72 Corvette POA Valve

Postby Sailfish95 » Wed Mar 27, 2019 4:30 pm

Thanks Tim, Does this lube replace the mineral oil that is used on the seals. The system was sealed about 6 months ago and the sight glass, has no bubbles. I tightened the nuts up and I did slow down the oil leak, still watching to it. If I dont need to open the system what is the best procedure to add oil? Thank for your help.
Ed
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Re: 72 Corvette POA Valve

Postby Dougflas » Wed Mar 27, 2019 9:34 pm

Oil can be added with an oil injection tool. If the refrigerant level is correct, you'd connect from high side to low side. Then you'd use high side to push oil in low side. This does take experience to do it this way as you do not want to slug the system.
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Cusser
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Re: 72 Corvette POA Valve

Postby Cusser » Thu Mar 28, 2019 6:27 am

You might be able to find some R-12 containing oil charge still available https://www.ebay.com/itm/R12-REFRIGERAN ... SwWXlcgCUy
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Tim
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Re: 72 Corvette POA Valve

Postby Tim » Thu Mar 28, 2019 10:43 am

Sailfish95 wrote:Thanks Tim, Does this lube replace the mineral oil that is used on the seals.


I would not take apart a connection that is not leaking. If you need to open the system. Yes, this is what I would use on the o-ring and threads.
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Sailfish95
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Re: 72 Corvette POA Valve

Postby Sailfish95 » Thu Mar 28, 2019 1:21 pm

Thanks for all the info guys. You guys are great
Ed
Sailfish95
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Re: 72 Corvette POA Valve

Postby Sailfish95 » Thu Mar 28, 2019 1:32 pm

Has anyone had any experience with tool, which injects oil in a closed system. It does not use the hi side pressure to inject the oil, but an internal piston pressure of the tool. I would think this would be easier to use than some tools that use the hi side to push the oil.
Ed

https://www.amazon.com/gp/product/B07JH ... 5J4JFKVT56
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Tim
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Re: 72 Corvette POA Valve

Postby Tim » Thu Mar 28, 2019 6:33 pm

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Sailfish95
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Re: 72 Corvette POA Valve

Postby Sailfish95 » Fri Mar 29, 2019 2:05 pm

Tim,
Thanks for the advice. I order the injector you recommended, with some mineral oil ID: 12738 . Is there a method I should follow when injecting the oil;
inject into the low side on the POA valve?, compressor off or on? How much oil injected per application?
Thanks for you help
Ed

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