Most of the 2.5"s have the modified chain tensoiner as well as a double-row timing chain.
Camshafts never(rarely) go bad on any 16v's.
Takes me 1 to 2 hrs to adjust all of the valves.
I do that at least 4-5 times a year on the racecar.
You MUST be very careful un-bolting & re-torquing the camshafts & the camshaft bearings.
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)