93 300D 2.5 - Bad Injector Timing Device

[svengruber]

I need advise. My vacuum pump failed this past week while my wife was driving the car. It apparently broke while on the interstate and presented no real symptoms until it was time to hit the brakes (i.e., lost power breaks) Since she was out of town, we figured a vacuum line had just come off or the like....long story short, she continued with her trip and just used a lot of leg strength for brakes and the shut off level on the engine to turn it off...the car probably went another 100-150 miles before getting back home.

I've since determined it was the vacuum pump that was the culprit. Got a new pump and in the process of putting it on now. Removed the old pump and sure enough it came out in pieces. I'm pretty sure I have all the pump parts accounted for, but have now discovered the stroke curve on the injection timing device appears non-smooth and damaged. Question #1 - I assume if it isn't smooth as new, it needs to be replaced too, yes?

I have a parts engine and just removed the timing device from it. The part looks to be in perfect condition. I've read the MB bulletin (07.1-8014, attached) for removing and installing a new timing device which indicates you remove the camshaft sprocket and chain tensioner to provide enough chain slack to remove the timing device (i.e., don't have to unlink the chain). Everything makes sense until the last few steps regarding locking the injection pump and any IP adjustments. I don't have the locking tool nor really understand how to do that. Question #2 - Is there an alternate way or any tricks to remove/install a timing device without locking the pump and having to re-time the IP? Question #3 - with vacuum pump already removed, any idea how many hours a good mechanic would take to remove and replace the timing device, ballpark)?

Thanks for the help. BTW, this is my 2nd round of vacuum pump failure.
svengruber