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Vball5153
Senior Member


Joined: 9 Dec 2003
Posts: 40
Location: Cincinnati
Expertise: I love coffee

Espresso: Isomac Millennium
Grinder: Solis
Posted Wed May 18, 2011, 12:43pm
Subject: Isomac expert needed
 

The rush of pressure and water that is usually released into the drip tray after I pull a shot with my Isomac Millennium isn't happening. That seeming lack of pressure is accompanied by soggy pucks in my portafilter. Can anyone diagnose my problem and suggest a solution that I may be able to handle on my own? Twice, I've had to pack up the machine and send it off for service, which is a real pain.
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frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,412
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Wed May 18, 2011, 1:22pm
Subject: Re: Isomac expert needed
 

Do you do a clear water backflush after each session?
Do you chemical backflush every two or three three months? (depending on usage pattern)

Most, depending on the age of the machine, the internal seals in the group may need replacing. They look like faucet seals washers- rubber with a hole in the center. Not difficult if you are handy. The one that is most likely the culprit is the lowest one (at the bottom, inside the lower protrusion of the group), but might as well replace all three as they are inexpensive, and as long as it is apart...

Here is a pic of an entire E-61 group. The red arrow is the part I am thinking needs to be checked.

frcn: E61groupALLweb.jpg
(Click for larger image)

 
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frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,412
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Wed May 18, 2011, 1:27pm
Subject: Re: Isomac expert needed
 

And here is that part disassembled.
1 - the replacement seal
2 - that is where the seal goes
3 - place the washer on
4 - then screw the shaft back on.

The wood is a jig I made. It holds the main body of the part while you unscrew the retaining portion of the shaft (I don't know the correct names of the parts offhand). Check a parts catalog for you machine as yours may differ slightly.

frcn: E61-3_3waysealEWB.jpg
(Click for larger image)

 
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MikeReilly
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Joined: 28 Oct 2007
Posts: 304
Location: Vancouver Island
Expertise: I love coffee

Espresso: Cimbali Junior Gaggia...
Grinder: Pharos CC45 Mazzer Mini
Drip: Cuisinart
Roaster: Behmor, I-Roast 2, Popper
Posted Wed May 18, 2011, 3:07pm
Subject: Re: Isomac expert needed
 

Sounds like the 3 way valve isn't doing it's thing.  If you pull the PF out right after a shot you might even get a portafilter sneeze.  Might need just some serious backflushing with detergent or could need to be taken apart and cleaned out well.
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stefano65
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stefano65
Joined: 30 Oct 2004
Posts: 1,412
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Wed May 18, 2011, 3:21pm
Subject: Re: Isomac expert needed
 

Do you do a clear water backflush after each session?
Do you chemical backflush every two or three three months? (depending on usage pattern)

2-3 months to backflush with detergent is lot of time
I personally suggest  (on home machines) once per week at the most every 2 weeks


ether you have a lot of gumming up or your springs and plunger are weak/worn

also is your pump reaching pressure (9-10) while brewing?

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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stefano65
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stefano65
Joined: 30 Oct 2004
Posts: 1,412
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Wed May 18, 2011, 3:21pm
Subject: Re: Isomac expert needed
 

frcn Said:

Do you do a clear water backflush after each session?
Do you chemical backflush every two or three three months? (depending on usage pattern)

Posted May 18, 2011 link

2-3 months to backflush with detergent is lot of time
I personally suggest  (on home machines) once per week at the most every 2 weeks


ether you have a lot of gumming up or your springs and plunger are weak/worn

also is your pump reaching pressure (9-10) while brewing?

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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Vball5153
Senior Member


Joined: 9 Dec 2003
Posts: 40
Location: Cincinnati
Expertise: I love coffee

Espresso: Isomac Millennium
Grinder: Solis
Posted Thu May 19, 2011, 7:30am
Subject: Re: Isomac expert needed
 

I'm the guy with the Isomac. Yes. I regularly clean/flush the machine with Cafiza espresso machine cleaner. But I've had the machine for many years. It may just be time to replace the washers. I'll do it. Final question for you helpers: Am I right that this problem has nothing to do with the pressure stat (Is that the right name for the part?)? The word pressure buried in pressure stat makes me think about that question. Thanks.
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frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,412
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Thu May 19, 2011, 8:26am
Subject: Re: Isomac expert needed
 

Vball5153 Said:

Am I right that this problem has nothing to do with the pressure stat (Is that the right name for the part?)? The word pressure buried in pressure stat makes me think about that question. Thanks.

Posted May 19, 2011 link

The pressurestat is a mechanical device that senses the pressure inside the boiler and based on that pressure it turns the heating element inside the boiler on and off (pressure thermostat as it were). Because the boiler is a sealed chamber, pressure is an indirect measurement of temperature. This has no effect on the problem you are having.

Based on the age of the machine, be sure that you also get a small packet of Dow111 silicone lube. Stefano, who replied above, has all the parts you will need at his online store/website http://www.espressocare.com

Here is an article I wrote about how the pressurestat works:
 http://www.frcndigital.com/coffee/pressurestat.html

 
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