Unable To Remove Leaking AC High Pressure Valve | FerrariChat
Buy

Unable To Remove Leaking AC High Pressure Valve

Discussion in '308/328' started by Lawrence Coppari, Apr 15, 2024.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
    Full Name:
    Lawrence A. Coppari
    #1 Lawrence Coppari, Apr 15, 2024
    Recently I noticed that the high-pressure valve on the York compressor was leaking so I want to replace it. Problem is that I am unable to remove the screw in valve core after having unscrewed it. I can see the threads sticking out, and I know the core is fully unscrewed because I can feel it when I continue to turn it. Yet I cannot remove it. I tried grabbing it with needle nose pliers, but it did not budge when I pulled on it a little. The system is discharged because I have replaced the shaft seal in the compressor.

    Any suggestions? Am I wrong to assume this valve core comes out like a tire valve core, merely by unscrewing?
     
  2. versamil

    versamil Formula 3
    Rossa Subscribed

    Apr 28, 2013
    1,227
    Gaston, Oregon
    Full Name:
    Brian Healy
    #2 versamil, Apr 15, 2024
    They certainly unscrew just like a tire schrader valve. The entire fitting unscrews off of the compressor- why not remove it and then just shove the schrader valve out from the opposite side. Change the o-ring where the fitting mounts to the compressor. If you have changed to R-134 these o-rings are different types of rubber than the originals. They're forty years old, change ALL the o-rings

    Did you do the seal with the compressor in place?
     
  3. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
    Full Name:
    Lawrence A. Coppari
    #3 Lawrence Coppari, Apr 15, 2024
    No, I had the compressor out last spring when I did the timing belts so that's when I replaced the seal. I would only drive the car in the mornings when it is cool or on cloudy days during the summer. The last seal lasted 8 years. Just a few minutes ago, I got the little bugger out using a hook and pulling rather hard. It did not act like a tire valve. They come out easily. Had I not succeeded in getting it out I was going to remove the entire fitting like you suggest. I have some R-12 so that's what is going back in once I evacuate the system. Thanks for the advice.
     
  4. versamil

    versamil Formula 3
    Rossa Subscribed

    Apr 28, 2013
    1,227
    Gaston, Oregon
    Full Name:
    Brian Healy
    #4 versamil, Apr 15, 2024
    So out of curiosity, could you figure out WHAT was holding it in? Did the small seal or packing on the schrader valve swell up and get caught on the threads?
    I've never had a valve get hung up, they just slip out.

    Good you have R-12! Retrofits cause other problems.
     
  5. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
    4,334
    Sydney
    Full Name:
    maurice T
    #5 maurice70, Apr 16, 2024
    That’s exactly what has happened, the seal swells up and becomes a real bear to pull out, If you are lucky then needle nose pliers will get it out but i have seen them damage the threads in the process.
    What you can do is buy a 1/4 female to 1/4 male adapter that has a Schafer in it and just screw in on the fitting leaving the old leaking bit inside, otherwise you have to pull it all apart..
     
  6. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
    Full Name:
    Lawrence A. Coppari
    #6 Lawrence Coppari, Apr 16, 2024
    Mine was swollen. The sealing portion (frustrum of a cone) had a ridge on the larger diameter end where the Shrader valve seats. It was interfering with the threads. The high-pressure side was more difficult to get out than the suction side. My Shrader valves came with the car. I bought the 328 in early 1988. New valves are now installed, and a vacuum has been applied. I'll let it sit until tomorrow to see if the vacuum holds.
     
    maurice70 likes this.

Share This Page