Hello, my dear brothers and friends. today I had to open the hood and tape a cable. However, I started the engine. One thing caught my attention, when I approached the right side of the engine (the belt pulley timing set part is not the opposite side, towards the gearbox side), when you rub two small iron together, it sounds like a vikivikivki or a weak sound is in that way. what is the reason for this sound? Thanks in advance for your valuable comments.