Changing the pump is fairly straightforward. Two things to remember, the bolt on the chain sprocket is a left hand thread and you'll need the locking tool to hold the pump cam in place for the swap.

You have to install the tool AFTER you rotate the engine to the proper location where you can see the indicator tab in the window of the pump.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250