Plenum Pull Advice, Starter Rebuild, MAP Sensor Info

[Dynomite]

Originally Posted by mgbrv8

Dose the zr1 have a orfice tube in the a/c system and were? When I have the system open I Am going to replace the accumulator, Change the high pressure and low pressure switches with new ones, Flush the entire system, Rebuild the AC compressor, Straighten the fins on the condenser, And replace all the O-rings And then vacuum it down and check for leaks And then pressurize it with nitrogen and check for leaks. Can anyone think of anything that I'm missing On a complete r12 overhaul and re-installation??

Dave

There is a screen with "O" ring sitting in the vertical tube (high pressure side) of the evaporator.

[VetteVet]

Originally Posted by Dynomite

There is a screen with "O" ring sitting in the vertical tube (high pressure side) of the evaporator.

Cliff's got it right. If you break the fitting where the high pressure line(small diameter one) goes into the bottom of the evaporator housing, you will find the orifice tube down inside the line on the evaporator side. You can grab the little plastic tab with a pair of needlenose pliers and wiggle/twist the orifice tube/screen out.

Jep

[mgbrv8]

Originally Posted by VetteVet

Cliff's got it right. If you break the fitting where the high pressure line(small diameter one) goes into the bottom of the evaporator housing, you will find the orifice tube down inside the line on the evaporator side. You can grab the little plastic tab with a pair of needlenose pliers and wiggle/twist the orifice tube/screen out.

Jep

Thank you gentalmen I'm going to order a new ofice tube tomorrow and have it ready. In your opinions am I missing anything important not only with the a/c but with any of the other systems under the plenium. I just don't want to neglect anything under there.

Dave

[scottfab]

Originally Posted by mgbrv8

Thank you gentalmen I'm going to order a new ofice tube tomorrow and have it ready. In your opinions am I missing anything important not only with the a/c but with any of the other systems under the plenium. I just don't want to neglect anything under there.

Dave

A quick check of all fasteners under there wouldn't hurt. I found several loose bolts on the oil vapor housing. I used lock tight on the loose ones.

[mgbrv8]

Okay guys sorry its been a while its been hectic again I got my water pump on and most of the silicon hoses attached now for the ac system. I removed my compressor and broke open all the line as to replace all the orings. The compressor was actually leaking from one of the bolts that holds the whole assembly together that are located under the clutch so that means the copper crush washers were leaking. I flushed all the line with ac flush and remove my schrader valves and capped them to keep any moisture or contaminants out also and I cleaned up my compressor.


Dave

[mgbrv8]

Its very important to get your compressor as clean as you can because when you break it open in needs to be as sterile as possible. Its also important to find some tight fitting plugs that fit in the compressor ports as to keep moisture and debree out of the compressor.

[scottfab]

It's also a good idea to date and initial the outside case of the compressor for future reference.

[mgbrv8]

Originally Posted by scottfab

It's also a good idea to date and initial the outside case of the compressor for future reference.

Good point Scott

Dave

[mgbrv8]

Oh by the way for those that haven't rebuilt a A/C compressor I found a couple good videos while I was looking up the clutch bearing part numbers that are very helpful for anyone doing it for the first time. A quick note if you don't have good head pressure it is likely that you compressor has lost enough oil over the years that the pistons are worn out but there is still a chance that its just debris on the valve plates causing weak compression.

Video 1
http://www.youtube.com/watch?v=CD5lLC5v6PE

Video 2
http://www.youtube.com/watch?v=MangGmPZc6g

[Coupe89]

Originally Posted by mgbrv8

Oh by the way for those that haven't rebuilt a A/C compressor I found a couple good videos while I was looking up the clutch bearing part numbers that are very helpful for anyone doing it for the first time. A quick note if you don't have good head pressure it is likely that you compressor has lost enough oil over the years that the pistons are worn out but there is still a chance that its just debris on the valve plates causing weak compression.

Video 1
http://www.youtube.com/watch?v=CD5lLC5v6PE

Video 2
http://www.youtube.com/watch?v=MangGmPZc6g

Doesn't look that hard