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The Oscar Saga Continues: Backflush Explosion
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Discussions > Espresso > Machines > The Oscar Saga...  
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 658
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 Wed Sep 26, 2012, 5:25pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

Well, I decided to have someone look at it locally. I brought it into the shop and the repair guy took it apart in front of me. Here's what happened:

-My descale worked for the most part, and the heating element and inside of the boiler looked like a shiny new penny.

-There was a piece of something stuck in the 3 way valve

-The rattle is NOT the pump

-There were some shiny flecks of copper that came out of the brew group after the tech rinsed out the boiler manually

-As you guys have suggested, the tech told me that I may have to grind finer because the pressure is now higher now that it's been descaled

-He accidentally got some water on the circuit board, so the machine needs to dry out before we can continue on it.

-My roommate suggested that the rattle could be the HX itself, inside the boiler, since we couldn't find the rattle no matter what.

I'll report when I get the machine back, hopefully tomorrow.
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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 Sep 26, 2012, 7:03pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

How do you feel after seeing him pull it all apart?

 
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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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 658
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 Wed Sep 26, 2012, 9:42pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

Honestly, I'm praying it still works when we put it back together tomorrow. Seeing the machine go pop when water got splashed on the board was pretty disconcerting. But this guy has a Synesso on one side of my Oscar and a Faema 3 group to the other side so I know I'm dealing with a pro who's passionate.
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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 Thu Sep 27, 2012, 9:24am
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

Well, I was hoping you would say that you felt like you could do it now that you have seen someone else do it.  I am sure everything will work out.  I don't have access to any one that works on Oscars in my area.  Stefano is not to far to go but he doesn't work on Oscar.  He has been help when I needed a question answered and I now know I can get a lot of the general parts like the pump from him.

 
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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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 658
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 Fri Sep 28, 2012, 2:09am
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

So I spent a few hours at the shop with the tech while we went through Oscar. We dampened the teflon tube that runs from the pump to the solenoid with some electrical tape because it was wearing against the plastic housing. He rinsed out the boiler and it's squeaky clean now. We put the thing back together and it has much stronger flow.

On your collective advice, I dialed my grinder one macro setting back and started experimenting with dosing 19.5 grams in my standard NS Double Basket. At setting 2J I pulled a perfect shot--60ml in 27 seconds with a mottled layer of crema on top (see below, beans aren't super fresh and the crema had sit for almost a minute). After that, each shot has been close to that and I think I might be situated now. My friend managed to get the Silvia tip to sit flush on the steam wand, so no more rubber O-ring to worry about getting milk under.

My only worry at this point is I asked the tech if I could bum a new group gasket off him because I assumed the old one needed to be replaced. He said sure and threw in a gasket that was MUCH thinner than the one that was in mine! Now, keep in mind mine was set up for pods when I got it, but I was never able to get the PF past the 7:30 o clock position. Now, depending on my basket, I can crank it almost to 5 o clock and it was leaking at first! Is this normal with new gaskets? Do they need to break in?

I've learned a LOT about my machine and feel better about working on it myself, but would like to think I'll be situated for quite a while and I can just focus on making coffee and enjoying it. Aside from the gasket thing, I think I'm almost there.

Markarian: IMG_0474.JPG
(Click for larger image)
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GVDub
Senior Member


Joined: 25 Jan 2008
Posts: 881
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600+
Posted Fri Sep 28, 2012, 4:56am
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

NS makes a couple of portafilter gaskets and I believe that, like my Ellimatic, Oscar takes the 4.5mm thick one, rather than the 7.5mm that most of their other machines do. I have to use a gasket shim (available from Espresso Parts, as well as other sources) if I want my pf to lock at the 6 o'clock position.
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Markarian
Senior Member
Markarian
Joined: 27 Jun 2012
Posts: 658
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 Fri Sep 28, 2012, 10:07am
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

The gaskets were marked on the bag as being for the Mac series.
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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 Sep 28, 2012, 1:36pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

Glad to hear you are feeling better about working on your machine. That is a really good thing.

From espressoparts where I got my last one:

NUOVA SIMONELLI APPIA/MAC/PROGRAM/PREMIER/OPTIMA/OSCAR FLAT GROUP HEAD GASKET SKU: S_2

72 x 58 x 7mm. Yes, they've switched back to the flat style. Fits all commercial models (except the Aurelia which uses S_418), as well as the Oscar model. For the home units, such as the Ellimatic or "Elli" use S_1

 
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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stefano65
Senior Member
stefano65
Joined: 30 Oct 2004
Posts: 1,415
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Fri Sep 28, 2012, 2:13pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

Coffeenoobie Said:

 And Stefano in Eugene doesn't work on Oscars.

Posted September 20, 2012 link

Really? I didn't know I do not work on Oscars
where did you got this impression?

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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frank828
Senior Member


Joined: 23 Feb 2011
Posts: 581
Location: Los Angeles
Expertise: Professional

Posted Fri Sep 28, 2012, 2:17pm
Subject: Re: The Oscar Saga Continues: Backflush Explosion
 

I'm using that gasket from espressoparts an I'm also having to crank the pf pretty far past 6 if I don't want leaks.  

I'd ideally like it closer to 6 but I don't mind how it is now.  Just took some getting used to.
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