Ryobi 2HP 240 V 120 l/min 50 l.

Acquired cheap at a local auction a few years ago.
It looked in good condition and pumped up to about 90 PSI without any issues.
Used it on and off for the intervening years, then left idle for a couple of months.

Now it only pumps to 15 PSI.
The check valve holds the 15 PSI no problem for several hours.

A very experienced friend and I fiddled, and eventually removed the sense pipe to the regulator.
The air from the cylinder would not blow past a finger held over the exposed orifice.
We concluded the problem is in the head.

Removed the head.
The inlet valve looks fine, nothing suspicious that would explain the failure.
There were fine burrs around the valve seat, stoned off with a small stone.

The gasket is tightly held to the head, and suspected of being glued.
It is about 5 mm thick and a 3-piece sandwich, gasket-shim-gasket
Visible through a port is what could be an edge of the outlet valve.

Piston and cylinder look to be in good shape, with oil detectable on the cylinder walls.

How can I safely get the gasket off the head ?

Would a razor-blade start it lifting ?

Am I barking up the wrong tree ?

Keep well,
John.

PS
Got two photos, but the system won't let me upload them.
Could be I have filled my allocation.
I will sort that out and post them tomorrow.


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