43-0618 is referenced in the IP timer section but is not to be found in the 124 CD FSM. It's in the 126 CD FSM but it's a single pager with nothing of value -

Preliminary work:
Remove visco-drive fan coupling

V-belts ... remove (only on engine 603.961)
Vacuum line [to brake booster] ... screw off, screw in, counterhold on threaded fitting
Hex. head bolts ... screw out, screw in. Remove vacuum pump together with seal.
Vacuum pump ... check for proper function

Cripes, not even a torque spec!

Sixto
87 300D