On the W108 chassis like yours the motor mount should have what looks like a nut welded to mount where the arm sits. From picture shown I can't see one. Looks like SL mounts instead.
(maybe the fan was too low & hitting the shroud)
------------------
MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar

[This message has been edited by M.B.DOC (edited 11-02-2000).]