Hole In la Peppina HELP!!!

A haven dedicated to manual espresso machine aficionados.
User avatar
eslimc

#1: Post by eslimc » Aug 23, 2012, 4:36 pm

Hello,
I just received a FRESH START Clean and Lube Kit and a set of new seals before that from our friends in Orphan Espresso. So after dissemble it I find a bump on the piston walls, I put a little pressure on it and bang! a hole in the wall!! On the other side of the hole is where the Screw on the front of the Cast Base goes, the metric allen one. I dont know what to do next, any advice??
Image
Image
Image

Regards,
Ernesto

User avatar
DJR

#2: Post by DJR » Aug 24, 2012, 12:31 am

It's going to be tricky to repair. One possibility is to fill the hole with a larger screw (retap) and then take it to a auto machine shop or motorcycle shop and see if they can clean up the cylinder. They might have the abrasive tools to do so.

No one I am aware of has proven what metal the La Peppina is made of. Is it aluminum? Is it Zamak? Zinc alloy? It would be nice to know.

User avatar
TomC
Team HB

#3: Post by TomC » Aug 24, 2012, 12:49 am

That looks tough. A permanent repair might be tricky. I think your best bet would be to email Doug and get his input. He might have an idea. I would think that using two different metals wouldn't work there, since they will expand and contract at different rates/different temps and just crack and fail somepoint shortly thereafter. Plus they would likely corrode quicker. Good luck though!

pacificmanitou

#4: Post by pacificmanitou » Aug 24, 2012, 1:31 am

I would think the allen screw would plug the hole well enough. The base is pretty tight, leakage shouldn't be a problem. I wonder if some product like jb weld is food safe enough to plug the hole. Personally I would buy a broken machine and part it out, or replace yours and part your current one out.
LMWDP #366

User avatar
SAS
Supporter ♡

#5: Post by SAS » Aug 24, 2012, 11:23 am

Some Advise:
If the cylinder is aluminium, there are "weld" rods (Super Alloy 1 and others) that are for pot metal and aluminium repairs, which melt using a propane torch. You heat the repair, scrub with a stainless wire brush, and with skill, fill the hole and a bit beyond.

That would be the easy part. Finishing the inside of the cylinder would be a bigger challenge.

Best wishes.
LMWDP #280
Running on fumes.

pacificmanitou

#6: Post by pacificmanitou » Aug 25, 2012, 11:27 pm

Is the cylinder aluminum? Ive heard of it being Zamak, but not aluminum.
LMWDP #366

User avatar
eslimc

#7: Post by eslimc » Aug 27, 2012, 2:19 pm

Thank you everyone, I took the advice of taking the part to a motorcicle shop and the fix it, La Peppina is back! for 350 mexican pesos and a regular job, not very nice for is working again.

Ernesto

User avatar
Carneiro
Supporter ♡

#8: Post by Carneiro » Aug 27, 2012, 4:52 pm

I think it's my fault the Zamak idea. Once I've wrote this as a metal shop told me it was Zamak. But some time later I've weighted the group and estimated the volume using a recipient with water and the density is very close to aluminum. Zamak should be 99% zinc and zinc has a much higher density...

So, I think it's an aluminum alloy, but who knows which? Probably one very prone to corrosion... :mrgreen: