oil pressure problem

[ryan1088]

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.

[welling service]

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.

[welling service]

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.

[supertek65]

Art!
For the right price i will sell you that bench grinder!
It will cost you though!
I just retrofit the controls and starter!!!

[jpsmith1cm]

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?

[jpsmith1cm]

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.

[supertek65]

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?

[jpsmith1cm]

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?

[supertek65]

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?

[jpsmith1cm]

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?

[ryan1088]

He's one of "them" who has to make his point twice!

[valdelocc]

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.

[welling service]

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!!