In what state is the timing belt without removing the plastic shroud or valve cover is impossible to know. But even then, the outside of the belt will show nothing. To determine what degree of wear it has, inspect its inner side, turn it inside out to do so. When checking the belt, pay attention to the rollers as well. Often, they become the cause of a cliff even of the highest quality belt. If the timing belt is worn, inspect and change the rollers if necessary before replacing it. Before inspecting roller bearings, it is necessary to remove the belt, as it is impossible to determine their condition without this.
After determining the condition of the timing belt and making sure it is necessary to replace it, buy the valve cover gasket. Prefer only original details. Do not use a sealant when replacing the gasket. Also note the crankshaft and camshaft glands. If they have traces of oil leakage, change them. There is no disaster in the oil leak, but when it hits the timing belt will accelerate its wear. Sealers also install without using sealant and choose only original ones.
When replacing the timing belt, pay attention to the pump. It also carefully examine whether there are no traces of leakage on it, and check the bearing condition. Without removing the belt, it is almost impossible to determine the undercurrent of the pump, as it is screwed to the cylinder block and the undercurrents of the antifreeze evaporate for a short time. If there are traces of antifreeze on the pump when the belt is removed, replace it as there is a risk that the antifreeze will increase. Also, don’t forget to check the drive belts. If they have cracks on the inside side, replace them as well.