Auxiliary Drive Belt and Drive Belt Tensioner—15 L Engine

Inspect all belt tensioner and pulley systems in this manner.

Pulley and dust shield can be serviced separate from spring tensioner. Spring tensioner is serviced as an assembly.

1. With belt ON drive, perform following checks:

   1. 
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      Use long-handle 1/2 in drive tool to test tensioning arm (A). If belt is against free arm stops (B) replace belt.

   2. Examine belt tracking mark on pulley. Replace belt tensioner if tracking mark is considerably wider than belt.

2. With belt OFF drive, perform following checks:

   1. Do not pry between pulley and spring case.

      Release tension on belt using a long-handle 1/2 in drive tool. Remove belt from alternator pulley.

   2. Release tension on tension arm (A).

   3. Rotate tension arm slowly using a 1/2 in drive tool. Arm should rotate smoothly between arm stops (B); if not, replace tensioner.

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   4. Replace tension mechanism if there is:

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        A - Tension Arm

        B - Free Arm Stops

        C - Metal-to-Metal Contact Between Arm and Spring Case

        D - Metal-to-Metal Contact Between Arm and End Cap

        Metal-to-metal contact is present between rotating and stationary parts at location (C and D) on tensioner.

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      • Cracks or broken spring case or broken stops.
      
      

3. Apply thread lock and sealer to cap screw and install belt tensioner in engine front cover at mounting hole. Tighten to specification.

   Belt Tensioner Mounting Cap Screw	Torque	70 N·m (52 lb·ft)