This is profesional recipe for repairing, so please if you can not continue in any point consult profesionals in your area!!!
After you open uper parts of Gaggia clasic the valve wil be visible. At first we remove plastic knob, than we disasemble the pipe holder nut from valve body 17 mm key and after that we take out no 5 alan key screws and take it apart from boiler. When you observe valve you will see that the axe is blocked with presing the metal of body, we need to grind-cut it loose from the body and unscrew it till comes out from body. Than body of valve is preparing for opening dents 1/4'' for blocking knob. Than we decalc and wash the parts, the axe when is dry we join it in one electric drill and take wery fine sandpaper to sand the conical part of axle, we need to coninue sanding until we loose the trace in axle, for testing we insert inn the axle and blow, after we see that we change the o ring in the axle , grease it with silicone grease and insert it inn, find one washer enough to fit inn the knob and to have hole enough small to block exiting of axle.after we put axle , washer and knob we glue it to be sure for unscrewing. We apply teflon over the rubber fitting at valve and we return valve in his place and screw it tight to boiler, than carefuly we insert the plastic knob and the pipe. We turn it on for testing and see does it leak anywhere, after sucsesful test we unplug the power, assemble completely and make one espresso for pleasure and drink it.
- Feel free to ask me aditional questions about it.
There is a gasket in there it needs to be replaced.
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