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Oscar group head steaming and pulsing water
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Discussions > Espresso > Espresso Mods > Oscar group head...  
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Apr 21, 2012, 8:36am
Subject: Re: Sirai pressurestat contacts
 

I collared the NS tech on the floor of the coffee show.  He felt that the Pstat should be fine if the machine is only 2 years old. (now 3)  He said it could be the left hand valve could be stuck or have scale in it or the water tank not seated right.  The tank not seated correctly would cause the water to flash steam.  I don't believe it is the tank because the water runs fine with the machine is cool. (but I will test that to make sure it is easy and no reason not to look at it)  I will probably take the left hand valve off next week and take a look at it.

 
Coffeenoobie

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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sun Apr 22, 2012, 9:19am
Subject: Re: Sirai pressurestat contacts
 

As I thought it was clearly not a tank seating issues.  I want him to be right and be a fast easy fix.  But I can't shake the feeling that I am right.  The only valve I can find on the left side of the tank is part number 07300370 that is a safety expansion valve.  I will have to take the case more apart to get to it so I will have to do it tomorrow.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Apr 23, 2012, 5:19pm
Subject: Re: Sirai pressurestat contacts or it could be a valve issue
 

Just in case anyone is interested there seemed to be nothing wrong with my 2 way valve but the one on the safety valve on the left side of the boiler has a small plastic part # 01000090 that is on the inside of it and it has a cap on the inside of it with feet.  I believe those feet would normally be together and stay inside the spring and the hole inside the other part.  When I opened the valve they were at strange angles sticking out of the spring.   I believe that to be wrong and I am getting another part while I have the machine open.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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side
Senior Member


Joined: 24 Apr 2012
Posts: 18
Location: Sweden
Expertise: I love coffee

Posted Wed Apr 25, 2012, 11:20am
Subject: Re: Oscar group head steaming and pulsing water
 

I hope everything will be fixed with the machine...
I really enjoy reading about fixing machines. Well i guess i like fixing a lot of things :p
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Wed Apr 25, 2012, 11:38am
Subject: Re: Oscar group head steaming and pulsing water
 

Thanks, I will post when the parts come in and get it working.  I hope by the weekend.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Fri Apr 27, 2012, 7:57am
Subject: Re: Oscar group head steaming and pulsing water
 

Updated with photo.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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side
Senior Member


Joined: 24 Apr 2012
Posts: 18
Location: Sweden
Expertise: I love coffee

Posted Sat Apr 28, 2012, 1:53am
Subject: Re: Oscar group head steaming and pulsing water
 

Do you have a  pic of the machine as well?
Not sure what kind of machine it is :)
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Apr 28, 2012, 8:24am
Subject: Re: Oscar group head steaming and pulsing water
 

Let me google that for you.

http://nuovasimonelliusa.com/oscar.html

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,156
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Sat Apr 28, 2012, 9:14am
Subject: Re: Sirai pressurestat contacts
 

Coffeenoobie Said:

I collared the NS tech on the floor of the coffee show.  He felt that the Pstat should be fine if the machine is only 2 years old. (now 3)  He said it could be the left hand valve could be stuck or have scale in it or the water tank not seated right.  The tank not seated correctly would cause the water to flash steam.  I don't believe it is the tank because the water runs fine with the machine is cool. (but I will test that to make sure it is easy and no reason not to look at it)  I will probably take the left hand valve off next week and take a look at it.

Posted April 21, 2012 link

Helen, my original Pstat died in less then 2 years, opinion is it had something faulty going on with it. The new one has had no issues and hopefully I won't have any issues for much longer.

So how is your machine doing? Hope all is up and running.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Apr 28, 2012, 9:17am
Subject: Re: Oscar group head steaming and pulsing water
 

The NS tech said "is it like it is flash steaming?" and I said yes, and he said clean the valve on the left hand side of the boiler.  When I opened it, it was in parts and the green part was sticking out funny. I put it back together but did not install it and ordered a new one anyway.  So far, so good.  It has fixed the flash steaming issue and it was on over night yesterday with no issues.  Did you see the photos/updates I added to the first post?

I am also worried I have not seen the flash pressure since I fixed it.  I just had it on for 10 mins or so then I opened the steam value and there was a dip in steam power then it gave me full steam.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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