Did altitude just blow out 2 MPS's?, Put the in my checked baggage...now won't hold vac. Options

[FlacaProductions]

Brought two of my 3 MPS back to L.A. from Indiana while I await the arrival of my LCR55A so that I could do some bench plotting and tuning only to find that neither one of the now holds any sort of a vacuum.

Both ran fine in the car before flight - just needed some adjustment. One has the factory plug replaced with a Tangerine model - the other is still factory sealed.

Did being in the unpressurized cargo area in my checked baggage blow them both?

That would really stink....

Brian

[FlacaProductions]

Well. It’s back together and it’s holding SOME vac now.
Like 20 seconds worth but that’s better than the NONE of before.
I’m suspecting the rubber seal around the outside?
As I first mentioned, the outer four bolts seemed a little looser than I thought they should be but this is the first time I’ve had one apart.

[Olympic 914]

Well. It’s back together and it’s holding SOME vac now.
Like 20 seconds worth but that’s better than the NONE of before.
I’m suspecting the rubber seal around the outside?
As I first mentioned, the outer four bolts seemed a little looser than I thought they should be but this is the first time I’ve had one apart.

There is no time, when it is running that the diaphragm is required to hold an absolute vacuum. It is constantly pulling vacuum and changing.

Although many will disagree with this, IMHO a 20 sec leakdown should not or only minimally effect the running.