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Bill OH · 11-13-2023, 11:44 AM

With the vacuum control on the distributor and the vacuum line disconnected, I advance the point plate by hand, then put my finger over the vacuum connection and the release the point plate and if the plate does not fully go back, the diaphragm is good. If the plate goes back to zero, then the diaphragm has a leak.

11-13-2023, 11:44 AM	#12
Bill OH Senior Member Join Date: May 2010 Posts: 454	Re: Bleed down on vacuum advance question With the vacuum control on the distributor and the vacuum line disconnected, I advance the point plate by hand, then put my finger over the vacuum connection and the release the point plate and if the plate does not fully go back, the diaphragm is good. If the plate goes back to zero, then the diaphragm has a leak.