The rocker arms are the most common problem. The newer version has a MUCH harder wear area that is welded to the rocker arm. USE that version with a hardened cam from a 1990 OR later M103 engine!

IF you are using used parts MAKE sure to put rocker arms against the same cam lobe they have been riding on.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator