I've been searching and haven't found any posts with my issue. I connected a pressure guage to my portafilter last night. Let the machine warm up and tried to take a reading. It leaked thru the top of portafilter? I had just cleaned the shower screen and thought that I may have disturbed the gasket, so I put my blind basket in and, everything was fine? I put the double basket in and water was coming out of the top of the portafilter. Grabbed some beans and ground and tamped and pulled a shot. No leaks???? Put the gauge back on the PF and leaks? Would not give a pressure reading. The double basket was in place when I put the PF on. Any thoughts?
With the pressure gauge in place, you need a seal between the basket and the PF as well as between the basket and the gasket - normally the pressure is contained by the coffee grounds and the basket, but with no grounds, the PF body is the part that has to be sealed to the group and that has to hold the pressure. The PF may have cut outs in the edge under the basket lip, or there could just not be a good seal there. If there's no cutout, try cleaning the inside of the basket lip and putting some teflon tape on the PF edge. Otherwise, you'd be best to do the test without the basket in place if you can get a good seal that way.
Also, the blind pressure (i.e. when the PF is terminated by the gauge) will be higher by at least a bar (and possibly more) when brewing a shot. This could be enough to cause the leak between the basket and the gasket that doesn't appear normally.
Agree, no basket. The leak is between the basket and PF. Of course the PF without the basket will rotate farther around to lock and may not seal as easily as the basket, different lip shape. 10 - 10.5 bar static and that will be about 9 bar in use. You can add a valve to the PF gauge plumbing and set the leak to about simulate your brew rate and set to 9 bar.
Let me explain, I searched specifically for a leaking portafilter while pressure testing and found no posts that specifically addressed my situation. I did however find info on the yahoo board that specified that the basket needed removed. I hope that is more understandable?
To everyone else thank you for the feedback. I got the pressure gauge connected and reading appropriately. You definitely don't want the basket in place and you need to make sure the PF is tight. From many searches, I also found that a lot of posters recommend adjusting the OPV 270* CC will get you close. My unit was close to 16 bar before adjustment. I made the 270* adjustment and it was at a solid 10.5 bar. Not saying that it will work for all but it was pretty accurate for my unit. Thanks again!
Good to hear that it all worked. Have you done the Silvia V1 wand yet? The OPV is a great mod for brew and makes the Classic much easier to use. Silvia wand is similarly helpful for steam. And then PID.....
You have made your machine easier to use. Not wanting to overstep the thread, but you may want to try something like Redbird Espresso or Redbird Blue Jaguar. Easy to obtain by USPS and easy to brew. Fairly known and consistent, and often recommended on CG. I use both.
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