Engine Mechanical problem
1985 Toyota Supra 6 cyl Two Wheel Drive Automatic 138000 miles
I had the main belt pulley vibrate loose and throw all 3 belts. When I try to tighten it, the bolt just loosens back out within 30-45 seconds and the belts quit spinning. There doesn't feel like there is a key or anything that the pulley needs to attach to. Is this a major fix or a minor one.