Drive Belt Tensioner Diagnosis

Engine Mechanical - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5150300

Step	Action	Yes	No
Caution: Allowing the drive belt tensioner to snap into the free position may result in damage to the tensioner.
1	1. Remove the accessory drive primary belt. Accessory Drive Primary Belt Replacement 2. Inspect the drive belt tensioner pulley. Is the drive belt tensioner pulley loose or misaligned?	Go to Step 4	Go to Step 2
2	Rotate the drive belt tensioner. Does the tensioner rotate without any unusual resistance or binding?	Go to Step 3	Go to Step 4
3	1. Use a torque wrench in order to measure the torque required to move the tensioner off of the stop. 2. Use a torque wrench on a known good tensioner in order to measure the torque required to move the tensioner off of the stop. Is the first torque reading within 10 percent of the second torque reading?	System OK	Go to Step 4
4	Replace the drive belt tensioner. Drive Belt Tensioner Replacement Is the repair complete?	System OK	—