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NS Oscar leaking water from around portafilter
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Discussions > Espresso > Machines > NS Oscar leaking...  
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nes1909
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Joined: 1 Oct 2013
Posts: 6
Location: Finland
Expertise: I love coffee

Posted Tue Oct 1, 2013, 5:09am
Subject: NS Oscar leaking water from around portafilter
 

Hello,

I have a 5 months old, unmodified NS Oscar. I'm now having this problem, where there's quite a large amount of water leaking around the portafilter. The leaking starts with some pressure, right before coffee starts dripping, and ends up with water dripping from the edges of the portafilter into the cup. The water seems to be clear.

I've had this same problem once before, but got it fixed by changing the gasket. However, this time it doesn't seem to work. I'm using a naked filter, and I'm also noticing some blind spots, which I haven't really had before.

Also, today I noticed for the first time that after closing the steam wand (as a part of the starting procedure), there was some water still dripping from the steam wand for about 20-30 seconds.

For the record, I did the backflush with some cleaner, about a week ago.

UPDATE:

Did a shot with lighter tamping, and the leaking was almost completely gone. Could tamping too hard cause the machine use more pressure, and therefore some of the pressure could leak between portafilter and gasket?
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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 Tue Oct 1, 2013, 9:23am
Subject: Re: NS Oscar leaking water from around portafilter
 

if you put the gasket in upside down they leak. flat side down the  ns up

 
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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nes1909
Senior Member


Joined: 1 Oct 2013
Posts: 6
Location: Finland
Expertise: I love coffee

Posted Tue Oct 1, 2013, 11:13am
Subject: Re: NS Oscar leaking water from around portafilter
 

Coffeenoobie Said:

if you put the gasket in upside down they leak. flat side down the  ns up

Posted October 1, 2013 link

Yeah I put it NS/logo side up, so that's not the case this time.
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Markarian
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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 Tue Oct 1, 2013, 11:22am
Subject: Re: NS Oscar leaking water from around portafilter
 

NS gaskets seem much stiffer than the "soft" gaskets I've experienced since moving to my E61 machine. To get my PF to properly engage, I ALWAYS had to brace my arm against the Oscar's side and really crank it on there.

What kind of basket are you using? Are there any dents in the rim?
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nes1909
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Joined: 1 Oct 2013
Posts: 6
Location: Finland
Expertise: I love coffee

Posted Tue Oct 1, 2013, 11:32am
Subject: Re: NS Oscar leaking water from around portafilter
 

Markarian Said:

NS gaskets seem much stiffer than the "soft" gaskets I've experienced since moving to my E61 machine. To get my PF to properly engage, I ALWAYS had to brace my arm against the Oscar's side and really crank it on there.

What kind of basket are you using? Are there any dents in the rim?

Posted October 1, 2013 link

I'm using a double shot basket, should be in an excellent condition without any dents etc.

But it might be just me not cranking it hard enough, since for that one shot I managed to get without leaking, I was really cranking it harder than usual, holding the machine in place with the other arm. I cranked the handle way over 90 degrees compared to front of the machine, when I usually leave it at about 90 degrees. Interesting though, that previously it has been working fine without cranking that much, this leaking thing only started few days ago.

Will try again in the morning.
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Oct 1, 2013, 8:19pm
Subject: Re: NS Oscar leaking water from around portafilter
 

I will bet you a milk shake you have it in upside down.

 
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
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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 Tue Oct 1, 2013, 11:02pm
Subject: Re: NS Oscar leaking water from around portafilter
 

nes1909 Said:

Could tamping too hard cause the machine use more pressure, and therefore some of the pressure could leak between portafilter and gasket?

Posted October 1, 2013 link

This should never cause a leak at the gasket. The Oscar has what's called a Neplax valve (which you should never, ever mess with, or even look at funny) that is designed to open at 15.5 bar in the event the pump builds up more pressure during the brew cycle than the plumbing can handle. If your gasket is new, and installed correctly, it may have cracked and you could just have ended up with a dud. I know changing the gaskets on the Oscar is a pain, but you may just have to shell out another nine bucks and try again.

BTW, when you said a doubleshot basket, are you talking about something nice, like a VST or Strada, or the stock Simonelli baskets that are shaped like a cereal bowl? If the latter, you might want to look into something with a smoother finish, like the aforementioned VSTs.
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nes1909
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Joined: 1 Oct 2013
Posts: 6
Location: Finland
Expertise: I love coffee

Posted Sat Oct 5, 2013, 2:07am
Subject: Re: NS Oscar leaking water from around portafilter
 

Coffeenoobie Said:

I will bet you a milk shake you have it in upside down.

Posted October 1, 2013 link

Well you just lost a milkshake :D I checked online for the correct way before inserting the new gasket, and yes I put it NS up :D


The solution was so simple, that I'm embarrassed to admit it: I just didn't crank the handle hard enough. For some reason I have to crank it a lot harder than what I've been doing earlier.
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nes1909
Senior Member


Joined: 1 Oct 2013
Posts: 6
Location: Finland
Expertise: I love coffee

Posted Sat Oct 5, 2013, 2:09am
Subject: Re: NS Oscar leaking water from around portafilter
 

Markarian Said:

This should never cause a leak at the gasket. The Oscar has what's called a Neplax valve (which you should never, ever mess with, or even look at funny) that is designed to open at 15.5 bar in the event the pump builds up more pressure during the brew cycle than the plumbing can handle. If your gasket is new, and installed correctly, it may have cracked and you could just have ended up with a dud. I know changing the gaskets on the Oscar is a pain, but you may just have to shell out another nine bucks and try again.

BTW, when you said a doubleshot basket, are you talking about something nice, like a VST or Strada, or the stock Simonelli baskets that are shaped like a cereal bowl? If the latter, you might want to look into something with a smoother finish, like the aforementioned VSTs.

Posted October 1, 2013 link

I only have the stock one :( Will look into those you mentioned, and order one :)
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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 Oct 5, 2013, 8:18am
Subject: Re: NS Oscar leaking water from around portafilter
 

A new gasket needs a break in time and it is a bit more springy at first.  I am glad you figured it out, I was pretty sure it was something very simple and basic.

 
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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