Hi sonn, where are you running into trouble? Do you need a routing diagram?
Ok, I've attached the procedure below. There were two different types of tensioners. The instructions cover both. Let me know if there's anything that isn't clear to you. When retightening the 1st version tensioner pay close attention to the adjustment. If you overtighten the belt you could ruin the tensioner. If the belt is already overly loose the tensioner may already be bad if you have the 1st version design.
Remove And Install Poly V-Belt