www.espresso-restorations.com The Espresso Machine Restoration site A non-commercial site for those interested in espresso equipment repair and restoration.

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La Marzocco 2 Group Linea AV overhaul Part 2

Before pictures

After pictures

You want something a little different?  Here you go.  These are the mounts that the boilers are resting on and fixed too.  They do get grubby and dusty.   I was playing around with different metal patterns....that is the steam boiler autofil solenoid.

Inside the groups was very much what I had expected with some mild scale build-up.  The groups were soaked in warm citric for a day or so, any longer and their nickel plating comes off.

Inside the groups was very much what I had expected with some mild scale build-up.  The groups were soaked in warm citric for a day or so, any longer and their nickel plating comes off. Sometimes if you are in a jam you can get away with reusing gaskets - not with the group cover o-ring though.  That is a one shot deal.

Let me try and show you the brew boiler.  The flange gasket between the group and the boiler is tricky, this one a silicone rubber has now been abandoned in favour (again) of the Novus Supra ones.   The paper ones seem to last longer than the silicone ones.

After I removed the nuts holding the group to the boiler the groups still would not come off.  Even gentle tapping with a wooden mallet didn't seem to work.  In the end I had to very carefully pry with a small screwdriver in the space with the gasket.  You have to be careful not to damage the boiler or the brass and not to break the studs.

Once I have put the groups back onto the boiler (which it self is a long and complicated procedure) I then pressure test the boiler for at least 24 hours to make sure that gasket is working as it should. Only then do I put it back into the frame.

No idea what possessed me to do this to the boiler mounts.  I thought it looked fancy and a little bit different!

Usually it is rather dirty inside the top panel but the fan on the AV models makes it just that bit worse.

The top panel (above the fascia switches) is usually the 2nd worst panel on the machine in terms of damage.  The worst is always the panel with the sight glass as it gets banged by the portafilters and scartched by the steam valve when people push it in too far.

Total time taken was 4 days 13-16 Dec 2004 New parts - all new gaskets, new p-stat and contactor switch, new cooling fan, new 1.8bar safety valve, new group diffusor screens x 2 and 2 new white steam bezel inserts.

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This website is created by Paul Pratt, Hong Kong 2004. If you would like to use any of the images or text I am sure I will say yes, but please ask first!   Email me here.