Author Topic: Refurbished Gaggia Classic shot times DECREASING with each shot  (Read 1285 times)

Offline KCcoffeegeek

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #15 on: September 25, 2017, 10:13:05 AM »
Tried the infernal pressure gauge again... filled it up with more water and caused leaking around the gasket. That POS does NOT work LOL Anyway, backed off the OPV another 1/4 turn, maybe a little less than 1/4 and finally she's behaving the way I am used to from my other Gaggias. I may open the OPV just a smidge more, even, but that's it for now.
Steve Agocs
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Offline JojoS

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #16 on: September 25, 2017, 10:31:44 AM »
Were you using the pressure gauge with a filter basket?
« Last Edit: September 25, 2017, 10:33:38 AM by JojoS »

Offline SusanJoM

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #17 on: September 25, 2017, 11:10:00 AM »
Were you using the pressure gauge with a filter basket?

That sounds like the most likely scenario.
 
It is counter-intuitive, but you have to test the pressure without the basket in the portafilter.

“Not everything that can be counted counts, and not everything that counts can be counted.”
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Offline KCcoffeegeek

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #18 on: September 25, 2017, 12:28:17 PM »
Yes. Didn't think I'd get a good seal without it.

Were you using the pressure gauge with a filter basket?
Steve Agocs
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Offline JojoS

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #19 on: September 26, 2017, 08:56:17 AM »
I hope you got that all sorted out by now. Don't use a filter basket with your pressure gauge.

Offline KCcoffeegeek

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #20 on: September 26, 2017, 02:01:28 PM »
Tried without the filter basket and it still didn't work. Just ran for a while, needle moved a bit, the gauge filled with water and then water started exploding from around the gasket. I'm over it. I'm in the ballpark and that's good enough for me. If I waste one more second with this stupid gauge I'm going to lose my mind.
Steve Agocs
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Offline D4F

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #21 on: September 26, 2017, 02:13:28 PM »
The flow method is reasonably accurate, corresponding to using a gauge.  Don't lose your mind over it :)

For any others wondering, look at the PF edge, it is fairly narrow and takes a fair amount of pressure to seal.  With the basket, the water leaks between the basket and PF, metal to metal.  You can brew with a basket because the pressure is in the basket, not the PF.  Gauge moves the pressure to the PF as the gauge seals the PF outlet.  Many of us learned this by the same experience.

Offline KCcoffeegeek

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #22 on: October 02, 2017, 08:10:18 AM »
Couldn't get this stupid PF gauge to work no matter what. Gave up on it and went to the blind test. I ended up more or less backing out the inside of the OPV about 4.5 full turns from bottoming it out when I initially put it back together. LOL
Steve Agocs
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Offline JojoS

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #23 on: October 02, 2017, 10:27:32 PM »
Mind posting a picture of your pressure gauge? It will be useful for us to know where it went wrong.

Offline Classicisti

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #24 on: October 10, 2017, 12:14:07 PM »
Have to agree w/ everyone on the PF gauge, as I found in my own trials, that NO PF basket works best and, i'd fill my PF gauge to the rim with water, before I put it into the machine. I would also slightly lock the PF into place a little bit tighter (maybe 1/2 to 1 inch past where it normally locks in...) to get a better pressure seal between the PF gasket and PF gauge. It's also why I put a spigot valve on my PF gauge, so i could let excess pressure (and air) vent.

It would take at least 10-15 seconds of the pump running, for enough pressure to build to start the PF gauge needle moving, then it would shake for about 5-10 seconds, then level out and hold pressure perfectly, until I opened the spigot valve to release pressure (while the pump is still running) and I'd check the pressure one more time to make sure its where I wanted it (8.75 to 9 Bar).

YMMV but it does take several seconds for teh pressure to build and stabilize in the PF gauges. It also makes a little bit of a mess with water, which is why I always did my annual OPV pressure check near the sink with a towel on standby!

Patience is key with PF gauges, hope this helps you out KCcoffeegeek ;D

Offline SusanJoM

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #25 on: October 10, 2017, 12:33:25 PM »

If you source a liquid filled gauge, use the correct connectors, and leave the basket out of the portafilter, checking the pressure is a piece of cake.

http://www.gaggiausersgroup.com/index.php/topic,1633.msg14169/index.php?action=ezportal;sa=page;p=9

Water in the portafilter?  Why would you do that?  The point is to replicate a shot.  You don't start a shot with water in the PF.

Creativity isn't always your friend....
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Offline D4F

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Re: Refurbished Gaggia Classic shot times DECREASING with each shot
« Reply #26 on: October 10, 2017, 01:03:48 PM »
The gauge is a sealed Bourdon tube

http://www.gaggiausersgroup.com/index.php/topic,63.msg2067.html#msg2067

Liquid filled gauges have oil in the gauge around the gears and in the housing to damp needle vibrations.  Water does not significantly enter the tube.  If so, the tube leaks and can not measure pressure.  It may be possible to fiddle and get air out of the bourdon tube and replace it with water, but it must not be needed to transmit pressure as that is not the instruction.  If you fill the chamber with water you may damp the vibration, but the chamber may not be water tight, not made for it. It may get some water as the gauge hangs upside down or at least with water overhead.

 

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