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element removal....well, trying to!
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,427
Location: Northern California
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Posted Fri Aug 30, 2013, 11:54am
Subject: Re: element removal....well, trying to!
 

jannus Said:

ok, so at about 200 degrees F I will notice waterdrops on the metal?  It rings a bell, so I must've seen if somewhere!  :-)

Posted August 30, 2013 link


No...
Slowly heat the metal. At around 200-210, if you drop small drops of water on the metal they should sizzle and steam. They are used as an indicator of temperature. The idea is to get the metal hot enough to expand but not become distorted or softened.

 
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jannus
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Drip: yup
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Posted Fri Aug 30, 2013, 2:33pm
Subject: Re: element removal....well, trying to!
 

frcn Said:

No...
Slowly heat the metal. At around 200-210, if you drop small drops of water on the metal they should sizzle and steam. They are used as an indicator of temperature. The idea is to get the metal hot enough to expand but not become distorted or softened.

Posted August 30, 2013 link

uhm....yes...that makes vast amounts more sense than what was circling in my head!
thanks for clarifying.  :-)
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jannus
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Joined: 19 Mar 2013
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Location: South Africa, Cape Town
Expertise: I like coffee

Espresso: NS ElliMatic & few...
Grinder: mazzer sj
Vac Pot: nope
Drip: yup
Roaster: nope
Posted Tue Sep 3, 2013, 2:01am
Subject: Re: element removal....well, trying to!
 

As a follow-up:  This turned into quite a mission.  It turns out that neither the element, nor the HX tubes, nor the drain plug (!) have EVER been removed on this machine.  It took someone with more tools and brute force (and a quite violent blowtorch) to get everything out.  I've taken the element in to be tested, and after some baking by the specialist, small amounts of moisture was effectively removed.  Overall, it is fully ok and not leaking, so I can reassemble.

Obviously when I reassemble the beast, I don't want to leave problems for the next guy who disassembles (seeing as it very well might be me).  I considered using coppaslip on all the joints, but that's not food rated afaik.  Would food grade silicone grease work?  I have Rocol Sapphire Aqua-Sil (not to try promote anything, I just want to know if anybody can confirm that it's up to the task!)

Click Here (www.rocol.com)  

It's drinking water rated, 200 degrees C usability, and supposedly "no stain" effect on copper, so I reckon it should be ok?  Most importantly, it's what I actually already have...  Heck, if I have to go through this amount of suffering again to disassemble some time in future, I'll not be very impressed with myself!  

Oh, and one last question - on the HX tubes seal at the boiler it's just copper on copper, no gasket, no nothing?  At the element side it's got a fibre washer of some sorts, so I made a stop by the plumbing shop for that.

Cheers!
Jan
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PeterWWbeagle
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Posted Thu Sep 5, 2013, 9:04pm
Subject: Re: element removal....well, trying to!
 

frcn Said:

I learned that watching a BMW motorcycle mechanic change the output bearing on a transmission cover. The bearings are just a press fit into the aluminum and he used a propane torch to heat the alloy until the water danced. At that point he turned the cover over, gave it a tap on the bench, and the bearing fell out on its own.

Posted August 30, 2013 link

Ah, brings back childhood memories of my mother screaming at me when she found a crankcase in the oven and rod bearings in the freezer.
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,427
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Fri Sep 6, 2013, 11:19am
Subject: Re: element removal....well, trying to!
 

PeterWWbeagle Said:

Ah, brings back childhood memories of my mother screaming at me when she found a crankcase in the oven and rod bearings in the freezer.

Posted September 5, 2013 link

And that brought back memories of me baking the aerosol orange color HT paint finish on an exhaust header and muffler for a VW bug in 1970.

 
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PeterWWbeagle
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Posts: 70
Location: Denver
Expertise: I love coffee

Espresso: Quick Mill Anita,CMA...
Grinder: Super Jolly, Mini, Macap
Vac Pot: Aeropress
Posted Fri Sep 6, 2013, 1:30pm
Subject: Re: element removal....well, trying to!
 

It worked, didn't it?

And it seemed perfectly reasonable way back then?
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jannus
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Joined: 19 Mar 2013
Posts: 71
Location: South Africa, Cape Town
Expertise: I like coffee

Espresso: NS ElliMatic & few...
Grinder: mazzer sj
Vac Pot: nope
Drip: yup
Roaster: nope
Posted Tue Sep 17, 2013, 2:11pm
Subject: Re: element removal....well, trying to!
 

Just as a final comment, I managed to assemble everything, and it all seems to be good!  :-)
No leaks, heat, steam.....and this shall lead to coffee.  I will post a separate thread with pics and details on the mods done.  Stil WIP though... :-)

Thanks for all the help!
Jan
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