Quincy 325 question

[MEngineer]

I recently got my Quincy 325 hooked up and fired it off. She purrs nicely.

My problem is:

When it cuts out there is a massive hissing coming out of the intake and it bleeds off the pressure in the tank.

Does this indicate that it needs its valve seats honed?

If not, what do I need to do to get it stopped?

Thanks in advance!

 

[jrsulo]

Tank check valve

 

[Fluxion]

Sounds like the seats need honed. Would probably be a good idea to replace the diaphragm and gaskets too. A head rebuild kit is pretty cheap on ebay. What's the ROC on your pump?

 

[Lwel9226]

Tank check valve

LynnW

 

[A_Pmech]

QR 25's do not have tank check valves, they are not needed.

It's time to dress the valves.

 

[CNGsaves]

Sounds like "that old compressor" is toast.

Put it on pallet to bring to Fastenal. I'll pay for shipping up my way !!

 

[jrsulo]

QR 25's do not have tank check valves, they are not needed.

It's time to dress the valves.

Did not know that !!!!!!!!

 

[mrpizza]

The valves are little metal discs. You can lap the disc and seat on a piece of glass with some wet sandpaper. Works real good.

 

[MEngineer]

My name plate is missing, but as far as I can tell it is a ROC 13 or 14...something in that neighborhood.

CNGsaves - thanks for the offer, but my chances of sending you my Quincy are less than a snowball's chance in hell.

I have replaced all the gaskets as I had it apart for other reasons.

I evidently was cutting corners when I did not dress the valves when I had it apart earlier.

 

[redmondjp]

As stated above, the 325 does not normally use a tank check valve, although my 325 apparently did come with one from the factory (it's covered with the OEM blue paint that matches everything else on the unit).

You can add a tank check valve as a short-term fix, but it does sound like the valve seats need cleaning up. This is the downside to compressors with steel poppet valves - if not used regularly, they can rust and then become leaky. You don't have that issue with stainless reed valves.

 

[pcmeiners]

Check on the pulley end of the crankshaft, the ROC may be stamped there.