The guide pin for the TENSIONER rail isn't threaded at all! I always screw a TAP into the pin until it grabs & then pull out on the tap.
The rt cam gear must be un-bolted to remove the tensioner rail & then re-torqued back on after replacement.
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)