Quote:
Originally Posted by Bearly Flying
Scott, I watched the diaphragms as the vacuum pulled back on the linkage, there was no apparent changes to the diaphragm, buckling or stretching that I could observe. No I did not measure anything, I'm not equipped to get that detailed in my garage.
My initial thoughts were that the diaphragm was being stressed by the sideways motion of the arm, but that is not the case as far as I can determine. When the diaphragm first starts moving the arm does move as it centers itself, but it does that in either case, after that the arm moves in a linear path, no sideways movement at all. There is a slight vertical movement due to the arc of the bellcrank, but again it is the same in either case.
If there is anything else you can think of to test, I have everything exposed now.
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You might do a leak down test of each diaphragm. Since these kind of actuators are specifically designed for a straight and linear pull your eventual failure will be a leak. Also while in there I'd put a new check valve in. That is where dirt likes to accumulate. And look for any arcing evidence on the ignition wires. I like to wipe them off and inspect that they are down all the way on the coil.