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Old 06-03-2001, 01:09 AM
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Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758

All reference is made to a '78 300D engine with York compressor.

I'll try to make this simple to understand so hopefully I'll get the answers I'm looking for. First off, I need a source or part numbers for "o" rings on my a/c hoses both ends coming out of the compressor as well as the filter dryer "o" rings. I also need p/n for the nylon seals on top of the compressor that the lines thread into.
The second question I would like to have answered is whether or not a York compressor uses an oil reservoir in the lower casing, and if so what oil is recomended in there, and at what point is considered full? Do you still add oil to a R34 refill? Any info on this compressor service would greatly be appreciated.


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Old 06-03-2001, 08:16 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
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Most A/C lines made AFTER 1981 can withstand the conversion from R12 to R134a, but not before. Expect to replace the lines as they start leaking. The o-rings are industry standard & so are most of the hose fittings so a *good* A/C shop should be able to made these lines & supply the o-rings.
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Old 06-03-2001, 09:12 AM
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Yes, You can do it.

Your moderator told you about the "O" rings being industry standard. Your hose material also is Industry Standard for refrigiration system.
When you have a leaking hose, don't throw away the most expensive part, the fittings; take it to a hose repair shop and have the hose material replaced using the fittings again.
I've done this for years and with out one failure.
As for the oil in the York compressor, yes it has a crankcase and the back plate with the fill plug must be in the proper position depending on the mounting of the compressor (vertical or horizontal).
If my memory hasn't failed over the years of York useage, the oil is Refrigiration 525 weight. If the compressor is noisy resulting from worn bearings, you may consider using refrigiration 1000 weight.
If converting to R-134a, the kit comes with a compatable oil charge. If you have lost oil through a leak, put in an additional Oil Charge.
Possibly another member may add to these hints.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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Old 06-03-2001, 10:09 PM
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Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758
Clarify the oils, can the compressor take the heat

Greetings Spiderman,

When you speak of oil in the crankcase of the York compressor, we are speaking of a seperate oil that is not under pressure that is poured into it aren't we? What weight is this oil, and where can it be gotten from? Do auto parts stores carry it? Secondly, if there is oil in the crankcase, then must there also be oil put into the freon system when it is charged? As far as the seals are concerned, do you think that the plastic or nylon seals on top of the York manifold are industry standard, they seem like they would only fit this unit. The last thing, is whether the York can take the increased pressures using R134 freon. Any input would be greatly appreciated.


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Old 06-05-2001, 11:50 PM
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Same Oil

Brother of The Benz, can do,
First, there are no seperate oils, the compressor oil is in suspension in the freon and circulates with the freon.
To check the oil level you close both service valves(if you have them) and remove the oil fill plug at the rear of the compressor. Using a probe, gauge the oil level. Remember if you have been running with a low freon charge then the majority of the oil will be trapped in the evaporator resulting from the freon not boiling over to the return line and back to the compressor.
This is why we always charge the system before we add oil for the oil of the fully charge unit will be circulating with the freon.
Refrigiration oil can be purchased from any reffer supplier.
The weights I referenced are unique to A/C oils.
If you are charging an empty unit freon and oil combined in the same container is available.
Good Luck it really is simple.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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Old 06-06-2001, 12:00 AM
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Join Date: Dec 2000
Location: Mark West, CA
Posts: 787
What I'm Being Told...

Is that the older systems set up for R12, will fail if converted to R134 or even the Freeze 12 refrigerant.

I have been repeatedly warned that the R12 systems will only continue to function properly with R12, and that the conversion to R134, or even to Freeze 12 will eventually result in compressor as well as other component failure, and that it is bst to just stay with R12...

My mechainic's bottom line, "Ask them if the will replace whatever components fail due to the conversion".
"We drive into the future using only our rearview mirror."
- Marshall McLuhan -

Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."
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