waid1017 wrote:I may pull an R4 from my local pic-a-part and re-seal it my self. As long as the compressor move freely and hear the compression strokes - suction and exhaust, it should be fine. Correct?
Nope - won't know how noisy/rattly it is until it's under load. The greasiest, nastiest, bottom of core barrel unit might be quiet while the new reman might sound like rocks in a blender. Unless you dealt with R4's when they were common in daily drivers 15+ years ago you don't appreciate what a headache they were.
The pics you have show a condenser with high side accumulator, so I assume the underdash is a TVX? Every R4 system (disclaimer: that I have worked on) was a cycling clutch / orifice tube with an accumulator that fed the compressor an oil mist on the suction side. No internal oil reservoir in a piston R4 so they don't tolerate low charge or no oil for very long.
If it's not a daily driver maybe longevity isn't a concern. The R4 that came on my DD went in the scrap pile in favor of a non-cycling V5. Wasn't even noisy by R4 standards. Sanden would have been easier but V5 was worth the effort.