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Old 08-17-2013, 03:12 PM
Benz in the Road Benz in the Road is offline
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Join Date: Aug 2013
Posts: 3
Saturday afternoon DIY repair of vacuum pump check valve. If you can recover the plunger, spring, and three-eared plate, this may be a short or long term solution for getting your vehicle back on the road quickly. It cost me 17 cents vs. 50 dollars for a new valve.

Got a .406 c-clip from the hardware store (pictured). My local Ace had them. Drilled out the center hole in the three-eared plate to a larger diameter (be careful, as the ears are sharp. I held mine with vise grips while drilling). I stretched out the spring out ever so slightly to make it longer, put the plunger and spring into the valve body, then rested the three eared clip on outer rim edge (it is originally welded to the inner edge) such that it was centered enough that it wouldn’t fall through. A small screwdriver works good for moving the plate around to the right spot. I then inserted the c-clip to pin the plate firmly to the outer edge of the rim. Added a dash of super glue on the plate ears and c-clip for added security (likely not necessary). When the glue dries, you’ll want to confirm smooth operation of the plunger by gently cycling it with a pencil or screwdriver.

You drill out the center of the plate because the c-clip effectively makes the passageway slightly smaller (you want to compensate for that). You stretch the spring because the plate has been moved away from its original position ever so slightly (you want to compensate for that, too).

Hope this helps somebody in a pinch.
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What should a vacuum pump check valve look like-check-valve-repair.jpg  
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