RV2 compressor question

[panhead]

Good day folks,

I'm working a 68' dart with a slant 6 and factory ac.
I vacuumed down the system and let it sit for about an hour or so and decided to check the oil level while I was waiting and when I pulled the fill plug out, I had a massive sucking sound and noticed that I had lost all vacuum in the system, gauge was at zero.

So, my question is: is this normal, or do I have a faulty RV2 compressor (rings, valve plates or both)
Any insight would be greatly appreciated.

Thank you for your time

 

[RustyRatRod]

Good day folks,

I'm working a 68' dart with a slant 6 and factory ac.
I vacuumed down the system and let it sit for about an hour or so and decided to check the oil level while I was waiting and when I pulled the fill plug out, I had a massive sucking sound and noticed that I had lost all vacuum in the system, gauge was at zero.

So, my question is: is this normal, or do I have a faulty RV compressor (rings, valve plates or both)
Any insight would be greatly appreciated.

Thank you for your time

Yeah, you opened the system.

 

[panhead]

I guess I should vacuum the system down again and let it be...

 

[Jim Kueneman]

It is not quite like an engine, the case of the RV is at the same pressure (vacuum) as the system.

 

[panhead]

It is not quite like an engine, the case of the RV is at the same pressure (vacuum) as the system.

Thank you very much. That makes sense. I'm new to the A/C world. trying to learn from the shop book and asking questions.

I did vacuum the system down again and was holding 30 inches over a period of three days.

 

[70dart340]

If you use a micron gauge, you can see very small increments of change in vacuum.

 

[Jim Kueneman]

Thank you very much. That makes sense. I'm new to the A/C world. trying to learn from the shop book and asking questions.

I did vacuum the system down again and was holding 30 inches over a period of three days.

You have a very tight system (and AC gauges!).. My rule of thumb is if it holds for 4-5 hours it will be fine.

 

[67Dart273]

The ONE (or two) big issues with vehicular AC is the shaft seal and the hoses. Hoses can leak right through the hose wall, and heat and all the "climate" under the hood does not help. The shaft seals can leak from corrosion, and lack of use, which probably is related to dirt intrusion and corrosion.

I simply don't understand how or why so many cars today with the compressor "down on the ground" survive. Even my 01 Cummins, which was a 2WD has the compressor very low mounted.

In newer vehicles such as K cars or anything of the 80's and later, as well as modern stuff, the connectors are very poor. Those stupid flange connectors on the compressors, with too thin bosses and not enough fasteners. If I remember right, the two lines on the compressor on my old Dodge 600 K car had ONE bolt