1973 220d vacuum governor - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 01-14-2012, 10:37 AM Thread Starter
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1973 220d vacuum governor

Hi everyone, I am new to Mercedes-benz. Just picked up a very clean 220d with running troubles. Hopefuly someone out there had the same problem as i. It will run with the vacuum line from the intake to the injection pump off,but will die as soon as it is reconnected. Hate to send out the pump for something not related or out of adjustment.. TKS...
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post #2 of 2 (permalink) Old 01-14-2012, 01:53 PM
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Usually if you disconnect the vacuum tube to the governor, the engine will run to maximum rpm, and that is not a good thing if the engine has just started.

If the engine doesn't run with the tube connected, there is too much vacuum. The butterfly air valve in the intake must be adjusted (is a screw).

In the topic below, there is a lot of information about how the pneumatic governor works.
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