I took apart Jone Jenz's bad MPS to find out why a AA rebuilt MPS would go bad in a short time (one year). It didn't hold any vacuum at all.

Hmmm, this diaphram repair/replacement is pretty suspect.

I will play with this to see if I can get it to work at all and how it compares to a good known MPS.


Geoff

How is the center stop attached to the diaphragm Geoff? It looks like solder or epoxy?

Both solder and epoxy. The diaphram is brass instead of copper. Handmade too.

Geoff

Looks like it is made from a soup can lid

I wonder why it lost vacuum? It would seem relatively simple to just reseal the thing up so that the vacuum was tight. I observe that the diaphrgm shown is dry and clean of any sealant for and airtight seal. Maybe thats the repair for this one?

Interesting to hear that AA is rebuilding these...We had thought that only Bret Instruments in Santa Ana was doing them.

I am R&D-ing a copper replacement diaphragm as we speak. I need to figure how to get the center stop fitting off of the original diaphragm and then onto the new diaphragm, it should be easy after that. No luck so far...but I'm not done yet...

lol, you kill me sometimes Karl.


Geoff

Yes Jeff, I think that is why this one leaked as there is no sealant. I will mount it in another MPS and give it a try. It was also missing the 2.0l spacer.
Maybe I should try to make one out of a soup can lid too?
Geoff

I present to you, the People's Exhibit A

Geoff, I wasn't trying to be funny... .first thing I thought was a lid from a can...

So now I see the demon that lurked inside my engine bay! Thanks for the pics.

Demon, ha! You had the typical AA horror story to get that POS too!

Oh, Karl they pleat the soup can lids for strength just like the MPS diaphram


Geoff

Geoff, we still need to chat about supplying you with cores.


B

New diaphragms would be the shiznit!