ACS Vesuvius Evo Leva

Systemic

Nylon washers work perfectly preventing any damage (unlikely) to the chrome surface of the group. If you want to go full obsessive, washers can be sanded down on one side to make a snug fit for the slightly angled surface of the group.

DenisS

Systemic can you point out the washers? I want to buy some for the group, mine is already heavy damaged after not even 100 shots.

LMSC

DenisS Sorry, that’s the wrong one. I’m not sure of that fit. Please ignore. I do not know what the size is, as I haven’t removed it.

Systemic Please share the link for the correct size. Most of our groups will be like Denis’s.

I guess, those nuts are unscrewed clock-wise,
is that correct please ? I would expect those nuts to be very tight.

Edit : Grease won’t prevent any damage, IMO. I have also gently greased, like you have.

LMSC

DenisS Here

DenisS

The diameter of these in is only 6.4mm, these fit the big shaft holding the grouphead piston assembly?

I did clean all the parts,put new grease in, centered the assembly so it wont drag, but it wont work.

Let me be clear:

DenisS

The spring tensions the piston and its shaft and there will be a small rotating movement involved when you compress and decompress the spring. This rotation movement is taken and stopped by the upper sliding mechanism of the lever. That is why you see the damage there. Normally to fix it you would need some sort of shims/spacers that are put at both ends of the spring, so they take away the twisting and the parts move free. That would fix the noise too.

You can then after adding the two shims/spacers screw the piston nut less so the travel distance remains the same for the spring compression.

Adding small teflon/plastic shims at the upper part will partially fix the problem. Maybe someone with better english skills in technical terms can put this into an easier to understand post. Thanks

Cuprajake

same happened to my brand new londinium - hence why it went back, well one of the reasons

Systemic

Domed nuts securing the top half of the group only need to be pinch tight. There is no water seal and their purpose is secure the lever assembly. I fitted nylon washers as I don’t like chrome on chrome contact. I got the washers from RS online - link here
https://uk.rs-online.com/web/p/tap-washers/0280537?cm_mmc=UK-PLA-DS3A-_-google-_-CSS_UK_EN_Fasteners_%26_Fixings_Whoop-_-Tap+Washers_Whoop-_-280537&matchtype=&pla-301736204368&gclid=Cj0KCQiAk4aOBhCTARIsAFWFP9E0Se4CUs5gpTF022NIWYtoDaB0ZBC4ZpyVqUgrpCtqdlcebyAXs1waAmN7EALw_wcB&gclsrc=aw.ds

I am pretty sure the bolt threads are M10 - @DaveC can you confirm.

This is what mine looks like

LMSC

Systemic Its the same as I had shared it with Denis. I had thought you found one to add to the sides of the lever shaft. 😊

Thx

Norvin

DavecUK The Evo is a type of space frame (is that the right word) of stainless steel

A type of Monocoque?

Systemic I am pretty sure the bolt threads are M10 - @DaveC can you confirm.

They’re M6 × 1.0. They take a 10mm spanner.

LMSC

Norvin Do we unscrew the bolts clock-wise ?

Eiffel

I’d say unibody, as in car design 🤔

Eiffel

@LMSC,
The 4 Acorn nuts linking the two halves of the brew group have a standard thread (i.e., they unscrew anti-clockwise when viewed from the top, as usual)

LMSC

Eiffel Sorry. No. that’s not I was asking. The question was removing the lever shaft bolts (as per Denis’s pictures).😊

I also think Norvin’s reply was also for those 4 Acorn nuts.

Elcarajillo

@ systemic, is it an optical illusion or is that nut split ?

DavecUK

Elcarajillo I thought it looked like a reflection of a piece of toast…no it’s an illusion.

Systemic

Elcarajillo

Optical delusion

Giphy - searching spanish GIF

Norvin

Yes, I was referring to the stud that holds the acorn nuts.

If you are talking about the shouldered bolts SM231 and SM230 on this diagram, they look like a smaller diameter goes into the bearings SM124 so the shoulders will be smaller than the thread. Any shims will need to be the diameter of the shoulder, not the thread. There’s not much room, if any, for any shims there on my machine.

LMSC

Norvin Thank you for the diagram. I’m not sure either; we need to check! It will be good if we are able to squeeze a nylon washer on each side.

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