Removal & Installation (Diesel Engine Belt Tensioner)

1. Remove nut from front of tensioning lever. Install a large mandrel or vehicle wheel lug nut wrench into hole on top of tensioning lever. See Fig 1.
2. Push mandrel or vehicle lug nut wrench to left until tension is relieved from tensioning lever bolt. While holding mandrel or vehicle lug nut wrench, remove tensioning lever bolt. Slowly release pressure on mandrel or vehicle lug nut wrench, releasing belt tension. Remove belt from alternator pulley. To install, reverse removal procedure. No adjustment is necessary for belt tensioner.

Fig 1: Identifying Belt Tensioning Device Components (Diesel Engine)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA