ISM, ISMe, and QSM11 – 013-021   Belt Tensioner, Automatic (Alternator)

• Remove the alternator drive belt. Refer to Procedure 013-005 in Section 13.

Remove the mounting capscrews and the belt tensioner from the bracket.

WARNING  Belt tensioner is spring loaded. Do not attempt to disassemble the tensioner. Personal injury can result.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

Check the tensioner for dirt buildup. If tensioner has dirt buildup, remove and use safety solvent to clean belt tensioner.

With the engine off, belt still installed, check that neither the top or bottom tensioner air stop is touching the cast boss on the tensioner body. If either of the stops is touching a boss, remove the belt.

Pivot the tensioner through the full range of motion. Tensioner must move with resistance, if not replace tensioner.

If this check is okay, check the belt part number. Make sure that the belt is correct for this option number.

Check the belt tensioner pulley and body for cracks. If cracks are found, replace the tensioner.

Spin the tensioner pulley. The pulley must spin freely. If pulley does not spin freely, replace the belt tensioner.

Inspect the belt tensioner for evidence of the pivoting tensioner are contacting the stationary circular base of the tensioner or the alternator bracket. If so, the pivot bushing is excessive worn. Replace the belt tensioner.

Install the belt tensioner.

Install and tighten capscrews.

• Install the alternator drive belt. Refer to Procedure 013-005 in Section 13.