Unboxing the Bosco Sorrento - Page 9

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LObin

#81: Post by LObin »

IamOiman wrote:Today I woke up to a very slight leak emitting from the lower fitting of the water level sight. This prompted me to turn off the machine, take off its panels, and wait for it to depressurize. It was a simple fix that required two 24mm wrenches to very slightly tighten the glass fitting while holding the other. It was much looser than I expected it to be, though for a new machine I knew that sometimes fittings could become loose over time from repeated heating and cooling cycles. The machine is running again while I keep an eye for any continuing leaks but I do not expect any.

This issue did allow me to admire the boiler and pipes underneath the panels since I do not take them off often.
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"Beauty attracts the attention but personality captures the heart..."

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IamOiman

#82: Post by IamOiman »

I relubed my group today. There was discussion on how long the piston seals would last and what material they were, and I decided to check it out. I thought I did not need relubing but after applying some (I use Danco food safe silicone grease) in a small amount the difference was startling. Taking out the group required unscrewing 4 allen bolts then grunting and twisting but going back in lubed up it just gently slid in. I realized also the upper group sleeve flares open a bit. This allows the piston gaskets to catch the bore more easily and this is also a design feature on the Faema Zodiaco groups. Also taking off the top decorative cap shows grounds making their way in. This was a good time to clean that out. Now that I think about it the group was probably lubed during its construction in October 2018 and I just did not think about it until this week. JohnB was insightful in pointing this out.
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The piston gaskets are as others have described in the past: silicone but more rigid than Cafelat (I have those on my Gaggia and could compare the two). There are four pistons and the arrangement shown below.
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I also decided to take off the cap bolt on top that was described as holding the lever fork when pulling down. I will see how that fares.
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-Ryan
Using a spice grinder violates the Geneva Convention
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JohnB.
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#83: Post by JohnB. »

Was your piston missing the white teflon guide ring or had you just not reinstalled it when you took the photo?
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IamOiman

#84: Post by IamOiman »

It did not have one in the first place, I forgot to mention that
-Ryan
Using a spice grinder violates the Geneva Convention
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cccpu

#85: Post by cccpu »

Beautiful machine... really starting to feel the urge to spring for a spring leva after seeing these Bosco shots and an Izzo Alex on another thread...

One of the most aromatic shots I've ever had came from a commercial Bosco in a shop in DFW area... Anyone else have similar experiences?
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JohnB.
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#86: Post by JohnB. »

IamOiman wrote:It did not have one in the first place, I forgot to mention that
That seems odd. Maybe they did away with it on the later machines?? It would be interesting to hear if it is missing on John or David's Sorrento.
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mathof

#87: Post by mathof »

IamOiman wrote:It did not have one in the first place, I forgot to mention that
A few months ago I pulled the spring assembly out of my L1 to lube the seals and discovered that the white teflon ring had somehow become misshapen and was protruding from its groove. I took it out, put the newly lubed assembly back in the group and ordered another teflon ring. Although I now have the replacement, I haven't got round to re-installing it. The mechanism works smoothly without it.

Espresso_Monkey

#88: Post by Espresso_Monkey »

cccpu wrote:Beautiful machine... really starting to feel the urge to spring for a spring leva after seeing these Bosco shots and an Izzo Alex on another thread...

One of the most aromatic shots I've ever had came from a commercial Bosco in a shop in DFW area... Anyone else have similar experiences?
Do it :twisted:
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bettysnephew

#89: Post by bettysnephew »

JohnB. wrote:That seems odd. Maybe they did away with it on the later machines?? It would be interesting to hear if it is missing on John or David's Sorrento.
The piston on my machine did not have the teflon ring. The groove was left open like in the picture. I looked at the bag that holds my spare seals and there is no teflon ring in it either. Apparently a running production change.
Suffering from EAS (Espresso Acquisition Syndrome)
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IamOiman

#90: Post by IamOiman »

In my Ascaso order I got a few bits for the Bosco, notably a bottomless pf with the wood handle. The ears are ~0.5mm taller if you get the default Astoria/CMA portafilter, so it will not lock in at 6 o'clock but is still secure. Taking a closer look it appears the ears on the Bosco PFs are 5.5mm. You could file the ears down I suppose. The handle takes an M12 thread and removing the original black handle was simple enough. Just take a heat gun and a strap wrench and it will get through any thread seal. I can now put my fancy tall glasses under the group, which before required a dish for me to pull my shot then pour it into the glass.

The part number for the wood nut handle is V..2153. They also make an M10 thread version (V..2062).
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-Ryan
Using a spice grinder violates the Geneva Convention
LMWDP #612