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more about the diaphram
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Posted by Monster (more from Monster) on Tue, 7 Nov 2000 09:35:05 Share Post by Email
In Reply to: Need more boost..., Gary C., Mon, 6 Nov 2000 22:32:47
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You asked how to tell if the used distributor diaphram you bought was good. It's a simple device, really -- just an actuator rod sticking out of a can with a hose on it. Apply suction or pressure to the hose and the rod moves in and out. If it's bad, the diaphram is probably broken; you won't be able to draw or hold vacuum on the line, and the actuator rod won't move.

Replacing one is not too difficult, but it's a little tricky. You take off the distributor cap, then take off the old diaphram which is held on by a couple of tiny screws. As you detach the old diaphram, you will be disconnecting the actuator rod from a little post inside the distributor.

The whole "trick" to installing the new one is to make certain you get the actuator rod onto this little nub again. You have to do it by feel, since you can't see what's going on in there. You'll see the little moving reluctor at the top edge of the distributor housing; I hold onto that with my fingertip while I try to fish around and thread the actuator rod onto its post. If you do it right, the reluctor won't move around freely once the diaphram is on there. It may take you a few tries to get it, but persistence will pay off and you'll know when it's right. Once you've got it in place, replace the mounting screws and test it by applying suction to the line. If the reluctor moves, you've got it. Replace the distributor cap, and you're ready to reset the timing.

Good luck, Gary.
- = M = -

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