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Tool Talk Discussion Forum

Quincy Compressor Problem

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Glenn F.

10-20-2005 17:33:19




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I have a #308 two stage Quincy compressor. It is leaking a little air back through the intake. What is causing this? Thanks, Glenn F.




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XXXRogerXXX

10-21-2005 10:02:11




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 Re: Quincy Compressor Problem in reply to Glenn F., 10-20-2005 17:33:19  
It is likely that this is a Qunicy model that uses no check valves, but rather, relies on the compressor valve plates to hold tank pressure. In this configuration, the unloaders hold the intake valves open for loadless starting, and to evacuate air from the cylinders on shut down. What can happen on these models, other than dirt on the valves, is that the valve guides which hold the springs and plate can sometimes wear out of round after many years, so the plate will not center on the seat properly, leaving a small, crescent shaped slit for air to leak back through. If this is the case, you will need new valves.

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XXXRogerXXX

10-21-2005 13:16:25




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 Re: Quincy Compressor Problem in reply to XXXRogerXXX, 10-21-2005 10:02:11  
I should clarify that it is the exhaust valve plates that are performing the check valve function in this arrangement.



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Steve Crum

10-21-2005 08:37:08




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 Re: Quincy Compressor Problem in reply to Glenn F., 10-20-2005 17:33:19  
Fix or replace the check valve between the compressor and tank and make sure your pressure switch bleed off the releases the pressure off the heads at shutdown, is working properly. Most compressors are not designed to start with pressure on the heads and start much easier without the pressure on the heads. Some compressors will blow a head gasket or head or break a rod if forced to start with head pressure.
"Ain't pretty" (or cheap) to fix one of these mishaps, especially on a Quincy compressor.

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Jay87T

10-21-2005 04:14:27




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 Re: Quincy Compressor Problem in reply to Glenn F., 10-20-2005 17:33:19  
Just need more info, but it sounds like you have a check valve problem.



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Glenn F.

10-21-2005 04:41:19




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 Re: Quincy Compressor Problem in reply to Jay87T, 10-21-2005 04:14:27  
I have been noticing it drops pressure slowly. Yesterday I went up and looked at it when it shut off, (165 lbs.) and I could hear a slight hissing through the air intake. I took off the air filter and put my thumb over the opening and it builds up pressure. Thanks, Glenn F.



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cactus farmer

10-21-2005 05:13:47




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 Re: Quincy Compressor Problem in reply to Glenn F., 10-21-2005 04:41:19  
Pull the valves and go thru them,decarbon them, check for weak and broked springs and lap them flat. Do both cylinders,you will see a faster recovery time when it is running to top off the tank.



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