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#1
12-15-2013, 04:21 PM
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Am I looking at the amount of vacuum correctly
I pluged in my Mity Vac to the brown & blue hard line comming from the vacuum switch on the ignition. I cranked her up and then turned off the ignition. The Mity Vac jumped immediately to around 30, and then slowly went down. The going down part is what I'm wondering about. It looks like to me the vacuum would have to decrease and not stay at 30. The reason I did this is because she would not shut down when I turned the ignition off. Turns out that the small piece of rubber vacuum that connects the brown/blue hard line to the shut off on the injector pump was perry well worn out. Let me know about the vacuum going down.
Merry Christmas Hugh Sr. 1984 190d (W201) 123,645 
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#2
12-15-2013, 05:00 PM
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Vacuum going down isn't right. There's a leak either at the switch (ouch!) or the vacuum source on the brake booster line(?). 30" Hg, if that's what you're measuring is very high but I don't think it's a problem. 22-25" Hg is typical. Maybe 30 is on another scale. You might try your MityVac directly on the shutoff actuator to see how much vacuum it takes to stop the engine. 12-15" Hg should do it and it should hold indefinitely.
Sixto 87 300D
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#3
12-15-2013, 06:58 PM
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you want to test vac pump by itself to know what it is putting out. Also want to test each branch for leaks.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
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