Good morning, with my V40, the starter defect was when a new one was installed, apparently the tensioning roller has disassembled into its individual parts and when starting the timing belt has skipped. Since then, the motor can only turn around 1/4. It is fitting during the start process and it did not work any more accordingly. How big is the chance that it will run again when a new strap is laid on? and if the head has to go down, what does one need of material and seals afterwards for assembly? Thanks already.