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Is It The Compressor?
Year: 1981
Make: Mercedes Engine Size: 3.0L Refrigerant Type: R12 Ambient Temp: 79degF Pressure Low: 60 Pressure High: 125 I just replaced my R4 compressor with a new (not a rebuilt) Compressorworks compressor, along with the receiver-dryer. I have thoroughly flushed the entire system twice. I also carefully added oil throughout the entire system, including 90 Ml in the compressor. I turned the compressor over by hand for 40 revolutions. The system held a good vacuum overnight. Total evacuation time was 4 hours. When I started adding R12, I noticed that the low side was not going down as I would have expected and the high side did go up as high as expected. There was some cooling, about 5 degrees differential from ambient. One other thing I noticed was that both needles on my gauges were fluttering, something I haven't noticed before. Which brings me to the title of this post: Is it a faulty compressor? Did I do anything wrong in the installation? I have installed about 8-10 R4s and this is the first one that acted this way. Thanks for your help.
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!) |
#2
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yes.i'm sure you didn't have a loose belt which is the only other poss explanation.so those pressures show a very weak pump[perhaps the reed valves].
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
#3
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I replaced the suspect compressor tonight with a known-good used compressor. That was the problem. As soon as the compressor clutch kicked in, the low pressure went down and the high pressure went up to the expected values with steady gauge readings. I figure that the suspect compressor had one or more bad reed valves.
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Tom Evans 69 280SE 91K (wish I still had it) 73 220D 98K 78 300D 134K 78 300D 185K 81 300SD 301K (still have) 82 300SD 321K (still have) 84 300D 268K 84 6.2 Diesel GMC Suburban 225K (a whole different story!) |
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