Quincy 325 air leaks after system unloads
(Perry, MI, USA)
Quincy 325, the compressor pumps up good, when the system shuts down and the unloader opens air will leak from the intake value until the tank is empty.
I am thinking it could be the exhaust valve letting air flow back from the tank.
I know that there is no check valve in the tank and that the exhaust valve acts like a check valve.
325 5hp 2 cyl Quincy has Air leak.
by Helmuth Slisarenko
Inherited 325 5hp 2 cyl Quincy.
Has been sitting unused for 15 years.
Rotated flywheel manually - easy.
Changed oil, fired it up, runs quiet, builds pressure to about 80 PSI then starts to leak pressurized air from valve on top of cylinder head while running.
If I shut down electrical, leaking stops and holds pressure.
Suggestions? P.S. I am an automotive Technician (retired) but have never had to do any air compressor repairs before.
quincy 325 leaks air out of the unloader
by ron weddle
i have a Quincy 325 air leaks out of the unloader while building up pressure then purges air but it continues to leak air out of the unloader.
Put new diaphragm and new brass shaft with rubber like seal cleaned all valves but continues to leak the same as when the problem started. Help.