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Espresso: Espresso Mods and Restorations
Does this connection need teflon tape, an o-ring, or nothing at all?
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humanoid37
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Posted Sat Jul 20, 2013, 2:07pm
Subject: Does this connection need teflon tape, an o-ring, or nothing at all?
 

Hi

Having completed the de-scaling, I am busy re-assembling my long term project - a Wega Nova EPU 1 (semi-auto sinlge group) and I got to this inlet connector block, which has 6 holes in it. 2 are plugged with hex-key caps. The other 4 are in use. What I don't understand is the connections. I only removed 3 of them for descaling and can't remember seeing any plumbers tape or O-rings. Looking at the untouched ones does not give me any clues either...

I can't see how these will seal properly without something! Any ideas? Pic attached... don't worry that pic is pre-descale... all looks much shinier now.

humanoid37: Wega Nova Inlet block.jpg
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frcn
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Posted Sat Jul 20, 2013, 2:45pm
Subject: Re: Does this connection need teflon tape, an o-ring, or nothing at all?
 

As difficult as those fittings likely would be once the machine is assembled, I would clean all threads and use teflon tape. if the machine is as old as that looks, it might have had some sort of liquid or paste sealant that all flaked off during disassembly. Normal precautions apply in terms of keeping the tape from getting past the ends of the fittings and into the machine.

 
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humanoid37
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humanoid37
Joined: 27 Oct 2009
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Location: Zug, Switzerland
Expertise: I love coffee

Espresso: Isomac Zaffiro, Wega Nova,...
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Posted Sun Jul 21, 2013, 11:52am
Subject: Re: Does this connection need teflon tape, an o-ring, or nothing at all?
 

Thanks frcn

I will proceed with the tape - that's how I started already... I reckon there was some kind of sealing paste used before.
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tracerbullet
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Posted Mon Jul 22, 2013, 12:08pm
Subject: Re: Does this connection need teflon tape, an o-ring, or nothing at all?
 

Keep in mind the direction you wind the tape and how the fittings spin into the rest of the pieces, so that it doesn't just unwind as you spin things together.

Personally I'd go with "pipe dope", it's designed for this kind of thing. I used to work Quality at an engine manufacturing plant, and I'd teach the new builders the difference between the tape and dope and why they needed to follow the manufacturing instructions when one or the other was called out in regards to oil & fuel related subassemblies. Tapes are basically a lubricant, a way of getting fittings to tighten in further. They didn't do a whole lot for preventing leaks, that had more to do with the threads mechanically deforming slightly into each other and anything under high pressure tended to still leak if you didn't really crank it down. Pipe dope on the other hand would provide a leak proof seal even when things were just hand tightened.

If you do go the pipe dope route keep in mind the type and how much you put on especially as mentioned in regards to getting it into your water flow.
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