I am about to replace the vacuum pump in my 1991 300D2.5. This is the pump that mounts to the front of the engine. In the MBZ shop manual it says, "During installation make sure that the lift curve of drive flange is at its BDC." What does this mean???
With the new part came an information sheet that says, "Install vacuum pump only if the stroke curve is in perfect condition" I am lost, I was under the impression that this was a simple R & R job.
Does anyone have any experience with replacing a pump on a 124 diesel??

THE vacuum pump is spring loaded. If you try to install the pump when the engine is at the wrong place it wont bolt-up. You may have to bump the starter a few times so that the pump will fit flush with-out much pressure, or you could damage the new pump. NO big deal.

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I can't help much, sorry! Just wonder what's wrong with the old one? any symptom? I have one like yours model, it'll be good to know about it in advance. thanks!

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I was changing my oil and was letting the oil drain for while while I looked over the car. I noticed oil on a few of the components and looked up and saw the pump was wet and oil was dripping from the cover.

I just got done the pump and wanted to let everyone know it went well. When you pull of the pump, there is disc with waves in it. As the engines turns over, so does this disk. The pump has a spring loaded wheel that rides the waves in the diish, this causing the pump to go up and down with the cycle of the waves. If anyone else should want to relace thier pump and have any questions, just let me know.