It's been a few years since I had a Robert Bosch rotary injection pump off a german engine. If my memory is correct, I believe, that when you loosen the bolts that hold the drive hub to the drive gear, the injection pump will turn by itself because, as the drive shaft is turned near the start of injection the rollers are starting to rollup on the face cam and when the bolts are removed the plunger return spring will push the rollers back down the cam allowing the injection pump to be out of time.
Now-- about the dots on the idler gear being out of time. The idler gear has an odd number of teeth on it and if you turn the engine over many, many turns, sooner or later, the marks will align themselves again. This type of gear is called a hunting timing gear. Just follow the instructions in the service manual and time the pump correctly and she will run. I would also suggest that you check the timing of injection pump by aligning the correct mark inside the injection pump to the engine, using the marks on the flywheel insted of the front crankshaft pulley. That's my 3 cents worth. charlie
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