I've got a 1980 300td with the vacuum-control-only transmission. It stopped shifting, period -- when it tries to shift up out of first I lose drive completely.

I just did what I ought to have done first, checked the main vacuum feed to the booster. The needle is shaking/twitching between 2 and 10 units. What I find odd is that the car shuts down fine and the brakes feel fine.

Questions:

1. If I understand correctly, the vacuum reading should be 20+ and steady, going into the brake booster?

2. There is no noise from the vacuum pump. Can I assume this is a diaphragm issue only, or should I get a rebuilt pump and be done with it?

3. Anyone have a link to instructions on doing the diaphragm? I am not having much luck using the search engine.

In the past I've left work in the vacuum pump to the indy but I'd like to try this one myself, this time around....

Thanks

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22