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Ignition Distributor which Vacuum Port?

1773 Views 5 Replies 3 Participants Last post by  willy3oy
I am following the Vacuum diagram for my 500 SEC (with 500SL Engine) and I need to run a line to the Ignition Distributor to advance the timing. My distributor has 2 vacuum ports, both of which are currently connected to the vacuum system and are almost certainly going to the wrong places. Could someone please shed some light on whether I should be using the lower or upper vacuum port on the distributor as shown in my photo. And what is the difference between the 2 ports? I have done a lengthy search but cannot find any mention of this. Thanks

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I felt the same way about my car, and discovered that my unit was shot. Have you tested it to ensure that it’s functioning properly? I’m not exactly sure about your version but I believe it should hold vacuum at one or both ports? Perhaps someone else can jump in to confirm that?
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