Compressor shelf life?

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Dave in Texas
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Location: Austin Tx area

Compressor shelf life?

Postby Dave in Texas » Wed Jul 13, 2016 2:51 pm

10+ years ago I bought an NOS York compressor manufactured in '75 for my '81 F100. (York factory tag reads: No. M1120857 R210L #16753 MFD 04-75)
For one reason or another I never had a need to use it. Drained 4¼oz clear/Brown oil from it today. Shaft turns w/wrench and makes compression.
Any reason I shouldn't add oil and install it?
My reason for using is to replace new comp that is making a LOT of noise. Worried it is faulty. Seemed to work kinda ok, but at high RPM really makes bad sounds.
Not sure how much oil to put in the NOS unit. Recent rebuild w/new evap/accum/conds/orfice tube and AC worked at idle but only managed to get to the high 50°s. My hoses have cut-offs at the compressor so I can isolate/change easy enough.
I've heard these bad noises before but only after years/years of use. Bad noises from new comp on day #1 after start, is very worrisome.
Help/advice very much appreciated. Thanks.
Retired IBEW Electrician. Veteran ('61-'67)
1981 F100 (bought new) 300-6 4-sp stock truck(R12)
1987 Coupe Deville (R134a)
2003 Harley Low Rider
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Re: Compressor shelf life?

Postby Cusser » Sat Jul 16, 2016 1:16 pm

I don't see any reason not to use it.
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Re: Compressor shelf life?

Postby admp » Thu Oct 19, 2017 2:06 am

The most important factor to a compressor’s shelf life is a positive holding charge. Holding charge is usually dry air, but nitrogen is used in some situations. The function of the holding charge is to keep moisture from infiltrating the compressor and oxidizing the internal components. Therefore, as long as a compressor maintains a positive holding charge, the shelf life of the compressor will be maintained.

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Re: Compressor shelf life?

Postby Walyo » Tue Aug 07, 2018 6:48 am

What is a positive holding charge? Thanks.
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Re: Compressor shelf life?

Postby ice-n-tropics » Thu Oct 25, 2018 1:35 pm

York shelf life is influenced by the position of the comp during storage.The box is marked to store with the shaft face down so that the face type shaft seal is immersed in oil. The compressor is shipped with a holding charge which should remain. The old spec mineral oil has much more tolerance for moisture than newer PAG. York common on old military diesel vehicles where noise isn't a problem.
hotrodac/Montalba TX

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