AC R4 pump questions
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Joined: Mar 2001
Posts: 89
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From: ca
AC R4 pump questions
I had the hood up on my '87 and could hear some noises by the AC pump and the idler pulley. With the belt loose, I found some play in the idler pulley and also the clutch pulley. The clutch pulley spun very freely and I could hear a little bearing rattle. I tried to turn the pump by the clutch plate and found it to be very tight and difficult to turn.
The air had been working fine, but with the tightness and bad bearing I decided it was time for a new compressor.
Here are my questions. After removing the 134 and the pump from the car, the pump seems to turn over much easier. Did I just pull a good pump when all I needed was a Clutch bearing? I does take a fair amount of pressure to get it to start spinning, but then turns freer.
When I bled off the 134, the pressure was 55 on both side and the ambient was just below 50 deg.
When I drained the compressor, I got almost no oil. I did let it sit overnight and ended up with a measured 1/2 oz. I was expecting more. Is that a normal amount?
The air had been working fine, but with the tightness and bad bearing I decided it was time for a new compressor.
Here are my questions. After removing the 134 and the pump from the car, the pump seems to turn over much easier. Did I just pull a good pump when all I needed was a Clutch bearing? I does take a fair amount of pressure to get it to start spinning, but then turns freer.
When I bled off the 134, the pressure was 55 on both side and the ambient was just below 50 deg.
When I drained the compressor, I got almost no oil. I did let it sit overnight and ended up with a measured 1/2 oz. I was expecting more. Is that a normal amount?
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
since your system is only pushing around 7 or 8 ounces total refridg. oil which is dispursed throughout the AC system, finding 1/2 ounce in compressor is OK. The good news is that your compressor was not dry.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
also, if you had 55psi on both your low and high side, this is normal if you had not been running the AC for awhile. With the compressor turned off, the entire system will come to equilibrium.
If you were running your AC and got those measurements, then you have a problem.
Since you have opened up the system completely to the elements, make sure you put a vacumm pump on for at least 30 to 45 minutes after you have re-assembled. Harbour Freight has a decent 2.5CFM vacuum pump for around $90.
http://www.harborfreight.com/cpi/cta...emnumber=98076
If you were running your AC and got those measurements, then you have a problem.
Since you have opened up the system completely to the elements, make sure you put a vacumm pump on for at least 30 to 45 minutes after you have re-assembled. Harbour Freight has a decent 2.5CFM vacuum pump for around $90.
http://www.harborfreight.com/cpi/cta...emnumber=98076
Last edited by MikeC4; Dec 20, 2008 at 03:00 PM.
