On a 1995 Oldsmobile Achieva, the belt tensioner is
automatic. There's no adjuster bolt in the traditional sense. The tensioner is spring-loaded and uses a pivoting arm. To replace the belt, you'll need to use a tensioner tool or carefully leverage the tensioner arm to release enough tension to remove or install the belt. A ratchet and socket (often a 15mm or 1/2 inch drive) on the pivoting arm of the tensioner may be required. There are usually indentations, holes, or a specific area designed for a tensioner tool (or a strong pry bar, used carefully) to push the tensioner to one side.
Caution: Be extremely careful when attempting to release the tension. The spring is powerful, and the belt can snap back with force. Always use safety glasses, and never put your fingers where they could be pinched or caught. If you're not comfortable performing this, it's best to take it to a mechanic.
Consult a repair manual specific to your 1995 Oldsmobile Achieva for diagrams and detailed instructions. This will show you the exact location and the best method for releasing the tensioner.
