Review on Enhanced Performance ACDelco Professional Automatic Tensioner – Model 38159 by Albert Bohimia

Looks great and rolls smoothly. One caveat: When installing this tensioner, it's easy to put the left-hand bolt (when looking at the front of the engine) in the wrong hole. There is a threaded hole just above the left tensioner flange where you can put a bolt and it WILL tighten against the face of the tensioner flange. However, when you start screwing it on, it won't feel good - it won't seat properly because it won't fit through the tensioner flange hole! This mistake can easily happen when working in the dark and/or after a beer or three. OVERALL: When you remove the stretcher, look at the holes it fits - there is a third hole above the left one. Do not put the left screw in this hole.