So...bought a used MK20, put it on a full tank, turned it on and immediate high pressure hissing ensued. Air coming out of ambient ports which I guess is the HP piston stem oring failing but also a jet of air coming from under the rubber end cap (out of a tiny hole in middle of hex fitting). Never seen that before, could the HP seat be so mangled that the air gets around it in the retainer and out of the hole (which I presume is used to push the seat out of retainer during servicing)?
Spectacular MK20 leak
- Thread starter p_kos
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hp seat and or the piston knife edge is mangled
It needs to be serviced, once opened up you can see what the problems are, o-ring missing one the seat or just worn out/broken, maybe someone used the wrong o-rings, really doesn’t matter since a proper rebuild will fix it.
Should be
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