Having his own compressor

[pescador775]

Efe, it is very unlikely that the head clearances or valve clearances have changed. As you know they are set by metal shims. There is a slight possibility that the exhaust valves have worn but the intake valves are made from stainless steel and I have not seen any wear. Sometimes, the first stage intake warps which decreases the air intake and sometimes the first stage exhaust wears a circle at the area where it contacts the spring.
Pesky

 

[pescador775]

The frame on my compressor is steel. The pump is a Kidde type 890228M
which has been assembled from spare parts. The knob shown in the picture
is a clutch control which tightens or loosens the belt allowing the engine
to be started under no load if necessary. This setup works on electric
assemblies also as it reduces the strain on the boats generator at startup.
There is a redundant condensator/filter system which uses a commercial
cartridge. I don't like the expense of cartridges but that is what I had on
hand. I had to modify the carburator air cleaner on the Briggs engine to fit in the
frame. Originally, it had a big plastic lawn mower type. I do not like it when
things don't fit just right so.....