 Did altitude just blow out 2 MPS's?, Put the in my checked baggage...now won't hold vac. |
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| FlacaProductions |
 Aug 20 2025, 11:19 AM
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Senior Member  Group: Members Posts: 1,998 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California 
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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 |
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| FlacaProductions |
Aug 20 2025, 04:50 PM
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#2
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Senior Member Group: Members Posts: 1,998 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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Here's the pics.
First time I've had one open but nothing looks amiss to me - tell me what I'm missing and what i should look at. diaphragm appears in tact to me. cell seems good...from what i can tell. The ONLY thing that I can MAYBE see is that the 4 bolts holding it together didn't seem overly tight. They were tight - just not as tight as I thought they should be. Seemed well-sealed tho...and clean. I doubt the tightness of the 4 bolts had anything to do with it.    [attachmentid=951886]  Attached thumbnail(s) 
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Posts in this topic
FlacaProductions Did altitude just blow out 2 MPS's? Aug 20 2025, 11:19 AM
flipb The cargo hold in modern jets is pressurized. The ... Aug 20 2025, 11:25 AM FlacaProductions They were well packed and padded.
F me. Aug 20 2025, 11:33 AM ctc911ctc Considering that the ALPS and the Rockies were tho... Aug 20 2025, 01:01 PM
emerygt350
Considering that the ALPS and the Rockies were th... Aug 20 2025, 01:17 PM ctc911ctc Thinking back I broke one by selecting PRESSURE ra... Aug 20 2025, 01:21 PM ctc911ctc
I think the danger would have been in the expans... Aug 20 2025, 01:36 PM JamesM
I think the danger would have been in the expans... Aug 20 2025, 09:33 PM FlacaProductions I just put two vacuum pumps on each one here in LA... Aug 20 2025, 01:17 PM FlacaProductions This might have just been a bridge too far for me. Aug 20 2025, 01:21 PM FlacaProductions that's the thing. no more diaphragms. Aug 20 2025, 01:23 PM burlybryan Your bag wasn't searched and the MPS's ... Aug 20 2025, 01:43 PM ChrisFoley Here's what I thought of:
The reduced atmosphe... Aug 20 2025, 02:35 PM JeffBowlsby
Here's what I thought of:
The reduced atmosph... Aug 20 2025, 05:40 PM JeffBowlsby
Here's what I thought of:
The reduced atmosph... Aug 20 2025, 05:50 PM emerygt350 The whole thing is a sealed area. Two forms of mo... Aug 20 2025, 02:36 PM ChrisFoley
The whole thing is a sealed area. Two forms of m... Aug 20 2025, 02:37 PM FlacaProductions I’ll crack the unsealed one asap and report back... Aug 20 2025, 02:50 PM Spoke The MPS senses the difference in pressure from amb... Aug 20 2025, 02:53 PM emerygt350 The diaphragm itself is a sealed vessel. Containi... Aug 20 2025, 03:15 PM FlacaProductions RE: Did altitude just blow out 2 MPS's? Aug 20 2025, 04:50 PM FlacaProductions AND....how do i put it back together?! Aug 20 2025, 04:57 PM rjames If the diaphragm isn't cracked and the seals a... Aug 20 2025, 05:06 PM FlacaProductions I could use some of that tequila right now. Aug 20 2025, 05:17 PM JeffBowlsby Post photos of the front/back of the diaphragm ple... Aug 20 2025, 05:20 PM emerygt350 You can test if the cell is doing what it should b... Aug 20 2025, 05:33 PM FlacaProductions I don't see any breaches. I've held it up... Aug 20 2025, 05:51 PM ChrisFoley
I've gently flexed it all around and don... Aug 20 2025, 06:09 PM FlacaProductions No cracks. I would think that it’ll tear or clic... Aug 20 2025, 07:41 PM FlacaProductions Well. It’s back together and it’s holding SOME... Aug 20 2025, 08:59 PM Olympic 914
Well. It’s back together and it’s holding SOM... Aug 21 2025, 08:46 AM Superhawk996 Grease the paper gasket (very lightly) that is a f... Aug 20 2025, 09:18 PM IronHillRestorations My guess is your suitcase got tossed by baggage ha... Aug 21 2025, 05:25 AM bdstone914 I once shipped a good MPS and it was dead on arriv... Aug 21 2025, 05:40 AM FlacaProductions Rats.
Both of these were shipped to me and they w... Aug 21 2025, 07:18 AM |
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