M3 very slow Leaking under the power wheel!

[srkhan]

My M3 is very slow leaking,
when i put my ear on power wheel hiss is there!
soapy water cant detect that hiss! behind the power wheel.

stranger things !

 

[Bigragu]

It’s leaking from where the power plenum enters and bolts onto the trigger block, more than likely. It’s either the two o rings of the front beak that insert into the plenum or air leaking where the valve rod exits out of the plenum.
Either of those require complete disassembly.

So the air you’re hearing is actually coming from inside the hammer spring micro adjustment slot

 

[srkhan]

its done! thank you. one orig was missing from the factory !