Vacuum pump failed

[jetdriven]

I haven't seen a wet pump in a J. But I just did the rapco 215CC pump on mine and it came with a gasket with 12 holes instead of 4. Is this the gasket you're talking about?

[MIm20c]

I understand why vac driven AI's get a bad name. However, so far I have no complaints and just figure $0.30-.40 an hour maintenance cost. Probably about the same as replacement batteries for the electric backup AI units.  Honestly it gives me piece of mind to have a backup separate from my single battery and alternator. 

[carusoam]

Great photos TonyK! Thanks, for sharing them.

Best regards,

-a-

[MBDiagMan]

On September 9, 2017 at 1:48 PM, LANCECASPER said:

The coupler sheared

Just as he feared 

.. And as for the AI,

the pump would no longer suck it.

[MBDiagMan]

On the more serious side of the thread...

About a hundred hours after I bought my Cessna 140, the vacuum pump went out, yes Cessna 140, it is an instrument plane with a custom panel with six pack, center stack, glide slope, Etal....  The pump was a typical dry vane version.  The mechanic said they only last about four or five hundred hours.

[TonyK]

It's so nice and shiny.

 

[Hank]

That looks nice! Cool baby calipers, too . . .