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Help! Oscar sprung a leak.
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Discussions > Espresso > Machines > Help! Oscar...  
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tijolima
Senior Member


Joined: 20 Jan 2013
Posts: 12
Location: Mayotown, MN
Expertise: Just starting

Espresso: Nuova Simonelli Oscar
Grinder: Rancilio Rocky
Posted Fri May 16, 2014, 6:13pm
Subject: Help! Oscar sprung a leak.
 

I have had our NS Oscar for about 1.5 years and love it.  But today he sprung a leak and I am wondering if someone can offer advice.  This is the plumbed model.  The drip tray had filled and overflowed.  Tonight when I had a chance to pull the top open, I found that there are two lines that come off either side of the brew head that drain into the drip tray.  The line that comes off the left side (toward the steam wand) is the culprit.  When the water is turned on to the machine there is an immediate fast drip out of this drain line into the drip tray.  Any ideas on the cause of this and how to resolve it?  As to usage-we brew 3-5 drinks daily and I back flush weekly.  Thanks so much. Tim
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tijolima
Senior Member


Joined: 20 Jan 2013
Posts: 12
Location: Mayotown, MN
Expertise: Just starting

Espresso: Nuova Simonelli Oscar
Grinder: Rancilio Rocky
Posted Fri May 16, 2014, 7:00pm
Subject: Re: Help! Oscar sprung a leak.
 

Upon further research on this site, I believe this is likely the over pressure valve.  Can this be cleaned or has it likely failed and needs to be replaced?  The water leak occurs even with the machine turned off so I know it isn't an actual over pressure issue.
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plindy
Senior Member
plindy
Joined: 27 Nov 2002
Posts: 73
Location: Seattle
Expertise: Just starting

Espresso: NS Oscar
Grinder: SJ Pharos Lido HG-One
Posted Sat May 17, 2014, 3:08am
Subject: Re: Help! Oscar sprung a leak.
 

valve neplex mid way down the page
I believe it's an OPV for the HX , to protect the HX if the machine were brewing with pods
in a plumbed machine the group is at line pressure at all times, unless the pump and 3 way are engaged
the valve is a spring and silicone seal  , the seal can harden or the spring can weaken
the valve is set to open at 16,5 bar . old style valve body 16 mm , small drain hose
new style body 13 mm , large drain hose
Support the outside of the valve so that it does not turn in the group head , very easy to strip the threads of the valve  or the threads in the group head , and limited spaced for wrenches
if you are able to turn the drain hose end tighter , do
if not you will need a new valve , and thread locking or pipe sealant adhesive , not pipe tape
ensure all water has drained from base , raise rear feet , water on the brain is not good

Gluck

plindy: Oscar_Parts_Book_a.jpg
(Click for larger image)
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thebaz
Senior Member


Joined: 27 Mar 2006
Posts: 79
Location: Victoria
Expertise: I like coffee

Espresso: NS Oscar LaCimbali Domus
Grinder: Rancilio md50
Posted Sat May 17, 2014, 8:28am
Subject: Re: Help! Oscar sprung a leak.
 

One more thing to check is the line pressure to the Oscar. I had mine at about 350kpa and it was Ok for a while and then did the same thing as yours.
I have a better pressure regulator on my water supply now, set at around 120kpa and have never had a problem since.
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