Originally Posted by FYVMMF

This is NOT correct! The locking tool will not pop into place as the IP camshaft is rotated! If the IP is off the pump it would have its camshaft rotated until the blade shaped indicator is visible and centered in the opening and then the locking tool is installed so that the indicator blade fits directly into the slot on the tool's spring loaded head. Any attempt to rotate the IP with the tool either correctly in place or incorrectly in place is ill advised, the 603/602 FSM details the Injection Timing Device R&R in section 07.1.10 11- 240
If during your inspection of the timing device you have ascertained that the damage is confined to the timing device's rotating cam and you have another timing device in good condition and available, you should consider simply replacing the rotating cam only.

To do that you would basically go about it the same was replacing the timing device itself, the advantage is that you can mark the position of everything and restore it back into the same position without altering the timing conditions.

Turn the engine until the crank indicator reads 15 deg ATDC AND the IP indicator blade is visible and centered, install the locking tool.

Remove the valve cover, use a nylon tywrap the secure the timing chain into place on the sprocket. Using carb cleaner or brake cleaner spray the timing device sprocket and the chain on it, mark that position on the sprocket and the chain with quick drying paint marker. Counter hold the timing chain at the cam sprocket using a bar or large screw driver through the holes in the sprocket's center, remove the left hand threaded center bolt on the timing device, spray the area behind where the bolt head would be, mark the position of the timing device and the nose of the IP.

Remove the cam sproket bolt it is a regular righthand bolt, and the cam sprocket, let is hang down into the timing chain chase, remove the timing chain tensioner.

You will now have enough slack in the chain to use a self made thin sheet metal shim to slip between the timing device sprocket and the chain, that will allow you to pull the timing device forward of the IP nose and out of the engine.

Once out of the engine you can disassemble the timing device itself and swap your good rotating cam into place for the damaged one. Then you can reassemble everything in the reverse order lining up the paint markings on the timing device sprocket and the timing device thereby avoiding any timing alteration issue.

The cam sprocket is tywraped to the chain so that can't chang, the crankshaft should not have changed and the IP should not have changed.

Get all that together and rotate the crankshaft a couple times to make certain, then rotate it enough to position the rotating cam so that the vacumn pump's roller is in one of the cam's valleys and install the new vacumn pump and gasket.