Stop driving that car & get that chain replaced NOW!! MB issued a Service bulletin(SI) in Dec 1994 (up-dated Nov 1995) on that exact problem. Have had to repair many damaged engines DUE to chain Breakage. SI number 05/93.
The original chains were SUB-STANDARD quality!!
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)