I talked with the folks at Terrell Machine in TX that does my vacuum advance can rebuilds, They said they have not had good luck trying to rebuild these as their material is too stiff.
I am thinking of asking Steele Rubber what the minimum order would be for new rubber for these cans. With new rubber Terrell should be able to rebuild them.
From: John Grady <jkg@xxxxxxxxxxxxxxxxx>
Sometimes the pull of the rod centerline is not aligned well or precisely with the lever on the air box very on these vacuum cans. Then it sticks due to side loading or scraping on the rubber bushing in the can..Erratically of course.. Maybe someone correctly spaced it out with a spacer, non factory, but aligned the rod to be straight with the force and centered on the can, can at right angle so it worked again .
Very related, I found that coating the rod very lightly over the bushing in-out travel part with Dow Corning silicone grease does wonders for these actuators. The rubber gets hard and does not seal well, then the actuator becomes weak due to vacuum leaking around the rod at bushing . The silicone grease helps all of that to work again, reduces friction, softens rubber and helps seal leak. At one time I was looking at adapting similar GM actuators that use bellows, (over this problem) so no leak is possible (better design frankly) ------those , or some, have one vacuum line with a spring load the other way.
Yes ---ours stay where they are when you shut it off. Check the rubber feed hose at engine fitting and at the firewall, they crack from heat under the hood. ,
Just FYI, the stock can seem to work Ok with grease even with hard bushings
Hope this helps,
On Wed, Mar 15, 2023 at 11:37 PM Rich Barber <c300@xxxxxxx> wrote:
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