The Espresso Machine Restoration site
A non-commercial site for those interested in espresso equipment repair and restoration.
|La Marzocco 1 Group Linea AV overhaul
|Manufacturer: La Marzocco srl., Florence, Italy
Model: Linea, 1 Group Semi-Automatic, 220V, Single Phase. 2300W
Approx Date of Manuf: 2001 serial 19XXX
Date acquired: November 2004
Working condition: Yes, taken as working condition, all handles, trim and pump in place.
Notes: Part of a maintenance agreement to overhaul the machine completely every 36 months.
Actually the machine was running well but it has been in operation for 3 years and was due for an overhaul. There
have been of late a few niggling little things like a few gaskets going here and there creating a few leaks which is to
be expected of a machine in service 24/7 for 3 years.
My main concern was the limescale visible through the sight glass which is a great indicator of what is inside the
machine. Also the group to boiler gasket had perished slightly and some scale was creeping through. Although
that was a poor component (the silicone rubber gasket) to replace it every few years is quite acceptable. Actually I
just want to show that with routine maintenance BEFORE anything major happens you can get your machine back
within a week in the same condition as it left the factory. This is a combination of having the skills and tools to do
the job, but also having a piece of equipment so well constructed that it should last a lifetime.
|Cleaning and descaling
Alright everything was completely stripped down and dismantled. What follows is my usual procedure:
Dismantle components (valves, flowmeters) and clean in an ultrasonic bath.
Descale all parts (especially boilers) in an acid bath.
Whilst the boilers are descaling (usually 3-4 days) I will clean the small components one final time in another
ultrasonic bath - this time with an acid solution.
The frame is washed down and repainted if necessary. The stainless steel panels are repolished and rebrushed.
|Clean components and reassembly
Without blowing my own trumpet it has taken me years of experience and experimenting to be able to get
components that clean.
|The completed machine
Sorry again no pictures showing it being built. Before rebuilding the brew boiler was tested under pressure for
48hours before going into the frame. That gasket between the group and boiler is tricky.
|Good for another 36 months
I have to say that this machine is pretty much as good as when it left the factory. In fact with the new CEME p-stat
installed and the new safety valve it is the same as current spec Lineas.
|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.