If they have only noticed one 'dimple' timing mark, on one cam, it's entirely possible the other was assembled at any point.

This is only my interpretation reading through.

Agree with above comments on accessing the valves via injector when removed, not possible - it may be doable via the inlet/exhaust ports as though?

__________________
David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)