Timing belt change Alfa Romeo 147 1.9 JTD 16V

Hello people =)) I am at an Alfa Romeo 147 1.9 JTD 16V and would like to know something about the timing belt change ! Prehistory: I was torn from the yard with 5-6km/h when driving backwards =((( of course I screwed down the valve cover see 2 tipping levers broken ! I opened the cover pulled out the defective timing belt and saw that the V-belt has loosened like spaghetti and wrapped itself firmly at the bottom of the KW au so on the alternator also ! I made everything of course clean so far ready for the new timing belt and 2 new tilting levers. When dismantling the tensioning roller I noticed that the threaded rod is loose so can be easily moved back and forth is that normal ??? ??? ??? ( threaded rod where tensioning roller comes on it ) Of course I change tensioning roller, deflection / guide roller and water pump ! I know you have chewed this topic very often =))) but I want to vo n you know could have survived the valves ? Can I just renew the tilt lever and go on ???? MFG