The following information is offered without guarantee (my knowledge is chassis, not engine).
According to the MK manual (which is for an inline Minimec pump, not a CAV rotary pump), there is a 'coupling' (like a dog-clutch), probably with a rubber insert.
Provided that you do not disturb the pinch-bolts that secure the halves of the coupling, you should be able to remove the injection pump and replace it without disturbing the timing.
That is how I read the manual which describes how to
adjust the timing:-
Quote:
Rotate the engine until the coupling flange bolt adjacent to the clamp bolt is accessible, and slacken the bolt.
Rotate the engine until the spill-timing mark on the coupling approaches the pointer on the pump.
Continue to rotate the engine until the spill-timing mark on the flywheel is against the pointer in the clutch housing timing aperture.
With the engine in this position, the timing mark on the coupling should be in line with the pointer on the pump. To reset the pump timing, slacken the second coupling bolt and rotate the pump coupling to bring the marks into alignment.
Tighten both coupling bolts.
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So, don't disturb the timing and you should be OK.
Edited to add:- read the next post before proceeding to remove the pump.