Markarian Senior Member Joined: 27 Jun 2012 Posts: 652 Location: Seattle Area Expertise: I love coffee
Espresso: ECM Technika IV Profi WT-WC Grinder: Baratza Forte AP, HG One Vac Pot: Bunn Trifecta MB Drip: Moka, Aeropress, Hario V60 Roaster: Behmor 1600
Posted Thu Dec 19, 2013, 6:40pm Subject: Wrong size gasket?
So I started seeing telltale signs the group gasket on my Technika wasn't forming a good seal anymore. Sure enough I took out the gasket and it was hard as a rock. I had ordered spares and went ahead and put one in, along with a new precision shower screen. Now my PF needs to be cranked all the way to the 4:00 position to seal! I was told that my machine uses a 8mm gasket but now I'm wondering if I should have ordered 8.5 or 9mm. Any advice? Thanks everyone.
Did the one that came out have a .5 mm paper shim above it? If so, is it still good enough to reuse, or destroyed in cleaning? The shims are only a dollar at even the most insanely overpriced retailers. (Teflon shims come in 1mm and 1.5 and will be more than a buck). If your current 8mm Gasket fits best with a .5mm shim, make your next gasket an 8.5mm.
In a pinch, you could make your own shims out of some heavy stock. I have to convert to inches for my brain to work, 1 mm is about 34 thou so half a mm is about 17 thou so that should not be too hard to find that is about 4 sheets of writing paper thick as an average sheet of paper is 5 thou give or take a little. You might even find some thin hard plastic to cut at that thickness and like SStones said, adjust the purchase of the next gasket accordingly.
In real life, my name is Wayne P. Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!
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