Air Compressor ID

[Gordon]

I acquired an old air compressor. Don't ask. Sometimes I just do dumb things. It is 2 1/2 bore x 2" stroke. The valves are leaking and I have not been able to repair them and I cannot find out who made the compressor so I cannot find replacement valves. I am not really understanding what is going on. I cannot get over 50 PSI and when I shut it off it leaks back through the intake port. Anyone identify this thing?

 

[Gordon]

Thanks to someone on another forum I have determined that it is a Quincy model 210. I have also determined that the cost of the parts to fix it cost more than the thing is worth.

 

[Scott_M]

Hi Gordon
I rebuilt my compressor and yours looks to have the same type of valve arrangement. before I rebuilt it from the bottom up I did a valve job a couple of years ago. Here are the valves and springs I took out for the recent rebuild.

The big ones are 50mm and the smaller high pressure valves are 32mm.

I had a bad leak down problem and did the valve job. The Valves are simply big hard disks. when I did the valve job it was simply a matter of lapping them on a glass plate with some wet / dry sandpaper. It worked well and solved my leak down problem and kept me happy for several years until I thought I was getting blow by on the rings so I rebuilt the whole thing.
The valve job only took a few hours and cost nothing, may be worth a try.

Scott

 

[Gordon]

This one is a little bit more complicated than that. The disk is broken and the spring (2.4) is in three pieces. part 2.1 and 2.2 are press fit together. I tried doing what you did but it did not really work. There is also a LOT of leakage pass the rings into the crankcase. If I put pressure of 20# at the output it blows the dip stick out of the crankcase.

 

[Scott_M]

That does sound pretty whipped.
I just wanted to make sure you knew the "servicing" of the parts was not too bad if serviceable.

Scott

 

[Thommo]

Unless there is some sort of sentimental connection to it or if you have a specific urge to rebuild, I think she’s due for the scrap yard.

 

[stevehuckss396]

OK Gordon if the expense is keeping it from being an air compressor scrap the heads and turn it into an IC engine.

 

[Richard Hed]

Unless there is some sort of sentimental connection to it or if you have a specific urge to rebuild, I think she’s due for the scrap yard.

Or better yet, put in the foundry scrap pile.

 

[minh-thanh]

stevehuckss396 !
I have watched a lot of videos on youtube about similar engines, but your engine is beautiful, do you have a video of it running?

 

[stevehuckss396]

No I do not. If I ever get it out and run it I'll try to remember