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Dove
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Joined: 28 Feb 2014
Posts: 3
Location: Canada
Expertise: Just starting

Posted Fri Feb 28, 2014, 1:02pm
Subject: Disassembling a shower screen
 

Hi
I have a Mokita espresso machine from 1996 and I'd like to disassemble the shower screen, however, the screen is attached with a shallow brass nut and I cannot get it opened. Does anyone know if that nut can be taken off?
I have tried taking off the bolts from inside the machine attaching the boiler to the group head but 1 out of the 4 bolts is stuck and I cannot take that off either, not even sure if I take off all 4 bolts the group head will come off. The machine seems to be working properly and the only reason I wanted to take those parts off is to get them cleaned, if those stubborn bolts and nuts will be stuck forever I will clean the machine from the inside with an espresso descaler.

Thanks

Dove: image002.jpg
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calblacksmith
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calblacksmith
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Posted Fri Feb 28, 2014, 1:35pm
Subject: Re: Disassembling a shower screen
 

Hello and welcome to the board.

That nut in the center of the dispersion screen should unscrew and allow the screen to be removed and give you access to the passages behind it.

If it has been a long time since it has been removed you might have a job of a time to get it loose. About the best you can hope for is to use a box end wrench on it, that will give you the most turning power to the screw head. If that fails, well, it is destruction time, a pair of vice grips MAY get it when clamped firmly but most likely, you will destroy the bolt and the screen will be damaged. If the bolt head breaks off then you will have to drill out what remains of the bolt from the group head (after you get it off) then if lucky, you will not need to retap the threads. Replace any damaged parts as needed.

 
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CraigA
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CraigA
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
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Posted Fri Feb 28, 2014, 2:57pm
Subject: Re: Disassembling a shower screen
 

calblacksmith Said:

About the best you can hope for is to use a box end wrench on it, that will give you the most turning power to the screw head. If that fails, well, it is destruction time, a pair of vice grips.

Posted February 28, 2014 link

Yeah, that brass hex head bolt head is pretty chewed up, but I think you'd have less chance of destroying it (but it SHOULD be replaced anyway), with a radiused 6 point socket.
The radiused corners of the socket transfers the torque force laterally away from the damaged corners of a nut & applies it to the faces of the hex, & allows you to get the bolt off.

You more that likely would have open box end wrenches like calblacksmith mentioned, & not the pro 6 point metric/sae sockets.

I don't know what size it is, & my pic is only for illustrative purposes to show you what the socket looks like inside. {;-)

CraigA: Radius corner socket1.JPG
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SStones
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SStones
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Posted Fri Feb 28, 2014, 4:15pm
Subject: Re: Disassembling a shower screen
 

CraigA Said:

I don't know what size it is, & my pic is for illustrative purposes to show you what the socket looks like inside. {;-)

Posted February 28, 2014 link

If it's the same as the similar looking Imat machines, it's a 14mm.
I think I have one around here somewhere, still attached to an old parts machine (I never throw anything away).  If trip over it, I'll measure it.
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stefano65
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Joined: 30 Oct 2004
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Posted Fri Feb 28, 2014, 4:45pm
Subject: Re: Disassembling a shower screen
 

yep 14mm
same as some single stage boiler Isomac and Elektra Nivola/cappuccina
What I did to one of my deep socket is grind it flat (most of them have a slightly rounded edge)
this will give it more "insertion" and therefor more to grab on

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CraigA
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CraigA
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
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Posted Fri Feb 28, 2014, 5:14pm
Subject: Re: Disassembling a shower screen
 

stefano65 Said:

What I did to one of my deep socket is grind it flat (most of them have a slightly rounded edge)
this will give it more "insertion" and therefor more to grab on

Posted February 28, 2014 link

Yes, & I did think about that when I saw the state & the thinness of his brass bolt, & that pic of the socket I posted.. {;-)

 
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Dove
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Joined: 28 Feb 2014
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Location: Canada
Expertise: Just starting

Posted Mon Mar 3, 2014, 9:35pm
Subject: Re: Disassembling a shower screen
 

Thanks for all your replies. No luck yet, but I will try other ways to get that sucker opened. To me it looks like most other machines have a screw attaching the screen to the top and that makes it much easier to get opened for regular maintenance. It doesn't seem the brass nut was a wise choice in using it for that purpose.
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fnacer
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Posted Mon Mar 3, 2014, 9:57pm
Subject: Re: Disassembling a shower screen
 

You can try a screw removal tool. The tool requires that you first drill a hole in the center of the bolt. And it's easier to do that if you have a replacement screw to gauge where and how deep to drill the hole. I used this method for the first time after battling an obstinate screw for several hours. And I felt very silly when the screw remover took all of 10 seconds to do the job.
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coffee_no_sugar
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Posted Mon Mar 3, 2014, 11:01pm
Subject: Re: Disassembling a shower screen
 

I like the idea of grinding a socket flat so it has more grip.  If you haven't tried it already, try unfreezing the bolt by tapping with a hammer or mallet.

As a last resort, you could remove the shower screen by any means possible.  You have to be very careful not to damage the brass diffuser disc underneath.  Once you have removed the shower screen, you have more room to use a wrench or vise grip.  

As for the 4 bolts holding the group in place, I had real problems with those too.  One of the nuts became so rounded that I had to removed by a dremel.  Later I found a hex driver that had thin walls.

Wesley
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alanfrew
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alanfrew
Joined: 19 Dec 2001
Posts: 642
Location: Melbourne
Expertise: Professional

Posted Mon Mar 3, 2014, 11:32pm
Subject: Re: Disassembling a shower screen
 

Dove Said:

Hi
I have a Mokita espresso machine from 1996 and I'd like to disassemble the shower screen, however, the screen is attached with a shallow brass nut and I cannot get it opened. Does anyone know if that nut can be taken off?
I have tried taking off the bolts from inside the machine attaching the boiler to the group head but 1 out of the 4 bolts is stuck and I cannot take that off either, not even sure if I take off all 4 bolts the group head will come off. The machine seems to be working properly and the only reason I wanted to take those parts off is to get them cleaned, if those stubborn bolts and nuts will be stuck forever I will clean the machine from the inside with an espresso descaler.

Thanks

Posted February 28, 2014 link

Removing group collar bolts needs an adapted 8mm socket, http://www.coffeeco.com.au/newsletter/june2012.html . To loosen the water distribution nut, use a medium flat head screwdriver and hammer. Turn machine upside down. Hammer a slot into one of the hex flats in the anticlockwise direction until the nut starts to turn. After cleaning, smooth out any burrs on the nut with a small file. The "damage" to the nut is purely cosmetic and doesn't affect function. See also http://www.coffeeco.com.au/articles/repair.html

Alan
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