I changed the timimg belt using the diy procedure and it was a life saver. I tensioned the belt according to the instructions and turned the engine over manually a couple times. The tension was then low, so I reset it using the procudure. The car starts and runs fine, but when I have checked the belt tension a couple times since, it is always on the high side of the window. Is this normal? If not, can I readjust the tension with the upper timing belt cover removed, or do I need to take it all apart and do it with the lock pins in etc.?