Hello, after changing the valve shaft seals (in the built-in condition of the head) logically changed the timing belt incl. water pump. But now I suddenly have side abrasion of the timing belt…. ????!!!! This has rubbed off at the turning roller on the inlet side.. The cause I could “see” so far is the following…: The old rollers have a straight bending edge…so this edge so that the ZR does not slide down… the new rollers have nac h up a small offset…so now the ZR-back has rubbed off until the steel strip insert has arrived at the a little offset outer edge… That’s not normal??!!!! I let the engine run with open cover… and with the help of one of the removed rollers the ZR is pushed away from this edge in operation. After releasing the ZR again quite quickly to the stops (as these would be a chip roll, WaPu and crankshaft wheel) . ..Well, what now? At the old ZR-KIT, with the straight edges was nothing with abrasion… what now? Thank you and greeting