Head Gasket #09A374

Head gasket (above the valve plate).

If the compressor pump doesn't seem to pressurize as quickly as it should or is leaking in between the head, valve plate, cylinder or crankcase while running, there's a good chance you need to install new gaskets. You can spray soapy water on the pump while it's running to inspect if there are any bubbles forming, which would indicate a leak.