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  1. #14
    Join Date
    Mar 2009
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    Mid-Mo
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    3,590
    Quote Originally Posted by welling service View Post
    I know how to check net positive oil pressure. The pump out put pressure is the one that falls. The suction remains constant. Read the post a little closer. I said that the discus has been replaced because it was the one with the busted rod. I have pulled the oil screen and it is clean and I have changed the oil also. It is a 4D model with two heads.
    Easy now. Jp was responding to Supertek saying it broke a rod.

  2. #15
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    Yes jpsmith1cm the discus was making a loud noise and jumping off of its mounts when the rod broke. The bearing was really worn as well as the crankshaft. If i remember right I found the bearing in two pieces after removing the bottom plate for a look see.

  3. #16
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    ryan1088 if you are implying that I was upset by jp's reply, i was not. I was simply stating that I knew how to measure NPOP and trying to clarify my first post. It looked like maybe I had not given enough detail info.

  4. #17
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    Art!
    For the right price i will sell you that bench grinder!
    It will cost you though!
    I just retrofit the controls and starter!!!

  5. #18
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by welling service View Post
    I know how to check net positive oil pressure. The pump out put pressure is the one that falls. The suction remains constant. Read the post a little closer. I said that the discus has been replaced because it was the one with the busted rod. I have pulled the oil screen and it is clean and I have changed the oil also. It is a 4D model with two heads.
    You'll forgive, then, my assumption that you don't know how to measure it because you didn't post it.

    As I said, output pressure of the pump is largely meaningless in this scenario.


    How fast does the pump pressure drop off?

  6. #19
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by welling service View Post
    ryan1088 if you are implying that I was upset by jp's reply, i was not. I was simply stating that I knew how to measure NPOP and trying to clarify my first post. It looked like maybe I had not given enough detail info.

  7. #20
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    JP

    are you insinuating that the cc pressure or suction pressure effects the pressure you would read off the top of the oil pump?

    are you insinuating that if the compressor was running on a bench with no refrigerant that his oil pressure would be less than 85 psi?
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  8. #21
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by supertek65 View Post
    JP

    are you insinuating that the cc pressure or suction pressure effects the pressure you would read off the top of the oil pump?

    are you insinuating that if the compressor was running on a bench with no refrigerant that his oil pressure would be less than 85 psi?

  9. #22
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    JP

    are you insinuating that the cc pressure or suction pressure effects the pressure you would read off the top of the oil pump?

    are you insinuating that if the compressor was running on a bench with no refrigerant that his oil pressure would be less than 85 psi?
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  10. #23
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by supertek65 View Post
    JP

    are you insinuating that the cc pressure or suction pressure effects the pressure you would read off the top of the oil pump?

    are you insinuating that if the compressor was running on a bench with no refrigerant that his oil pressure would be less than 85 psi?
    Whassamatter, stinky?

    You think that was so important that you posted it twice?

  11. #24
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,590
    He's one of "them" who has to make his point twice!

  12. #25
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,375
    Quote Originally Posted by supertek65 View Post
    JP

    are you insinuating that the cc pressure or suction pressure effects the pressure you would read off the top of the oil pump?

    are you insinuating that if the compressor was running on a bench with no refrigerant that his oil pressure would be less than 85 psi?
    The discharge pressure varies in direct proportion to the crankcase pressure.

    I wonder if the discharge pressure builds up to the point where the relief valve opens? maybe thats why it runs fine for a little while.

  13. #26
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    It starts up at about 85PSI and then drops to around 50 PSI. My CC pressure is about 25 PSI. I never see much variation in the suction pressure. It will run like this for various times and sooner or later trips on low oil pressure. It has run for two weeks one time before tripping. I have not had my gauges on it when it trips so I don't know if the pump output is going down or the CC pressure is coming up. I have done a piston blow by test and found no problem. The comp. pumps down just fine and holds. I thought maybe the OPC was bad so I installed a new one with the same results. The oil pump is newly installed because at first I thought the pump was worn and not maintaining pressure. I have never run up on this problem before and I don't mind saying I AM STUMPED!!

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