Inspect Belt Tensioner

RXA0073092-UN-09JAN04

RXA0074277-UN-29MAR04

RXA0073094-UN-09JAN04

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

SERVICE INTERVAL—1500 Hours

IMPORTANT: Inspect all belt tensioner and pulley systems in this manner.

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

1. With belt ON the drive, perform the following checks:

   1. Check to see if tensioning arm (A) is against free arm stops (B). Replace belt if this condition is seen.

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

2. With belt OFF the drive, perform following checks:

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

   4. Replace tension mechanism if there is:

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

   Item	Measurement	Specification
   Belt Tensioner Mounting Cap Screw	Torque	70 N·m (52 lb-ft)