Centinel System – Repair Manual – 013-021   Belt Tensioner, Automatic (Alternator)

NOTE: The belt tensioner is spring-loaded and must be pivoted away from the drive belt. Pivoting in the wrong direction can result in damage to the belt tensioner.

All accessory belt routings are not depicted. Tensioner and tensioner bracket locations are representative.

Remove the capscrew and belt tensioner from the bracket.

WARNING  When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. Hot steam can cause serious personal injury.

Check the tensioner for dirt buildup. If this condition exists, the tensioner must be removed and steam-cleaned.

With the engine turned off and the alternator belt installed, verify that neither the top nor bottom tensioner arm stop is touching the cast boss on the tensioner body. If either of the stops is touching a boss, the alternator belt must be replaced. Check to make sure the correct belt part number is being used if either condition exists.

Check the tensioner pulley and body for cracks. If any cracks are noticed, the tensioner must be replaced.

Check the tensioner for dirt buildup. If this condition exists, the tensioner must be removed and steam-cleaned.

Check that the bottom tensioner arm stop is in contact with the bottom tensioner arm stop boss on the tensioner body. If these two are not contacting, the tensioner must be replaced.

Inspect the tensioner for evidence of the pivoting tensioner arm contacting the stationary circular base. If there is evidence of these two areas contacting, the pivot tube bushing has failed and the tensioner must be replaced.

Install the tensioner and capscrew.

Using a 1/2-inch square drive, lift and hold the tensioner. Install the drive belt and release the tensioner.