Originally Posted by
roylo
I had it set one day and it was fine. Drove it the next day (colder weather) and the tension was slightly tighter on it own and the belt came off in a flash.
Your belt tunnels need to be changed. All the problems people have had with belts and idlers come down to the belt tunnels getting warped, which misaligns the front belt idler, which randomly causes the belt to come off. One hard yard dart is enough.
If you search this thread, you will find many other users over the past six months who have had this problem.
It is also why so many of us have gone to the chassis brace, which (IMO) is misnamed. It's a belt tension stability device. Chassis under compression with the chassis brace:
Chassis under compression, one end of chassis brace removed:
