Drive Belt Tensioner: Testing and Inspection
Drive Belt Auto-tensioner InspectionSpecial Tools Required
Belt tension release tool Snap-on YA9317 or equivalent, commercially available
1. Turn the ignition switch ON (II), and make sure the A/C switch is OFF.
2. With the engine OFF, check the position of the auto-tensioner indicator's pointer (A). Start the engine, then check the position again with the engine idling. If the position of the indicator moves or fluctuates very much, replace the auto-tensioner.
3. Check for abnormal noise from the tensioner pulley. If you hear abnormal noise, remove the auto-tensioner, and replace the tensioner pulley.
4. Turn off the engine. Move the auto-tensioner (A) in the direction shown with the belt tension release tool (B) to relieve tension from the drive belt (C), then remove the belt.
5. Move the auto-tensioner within its limit with the belt tension release tool in the direction shown, check that the tensioner moves smoothly and without any abnormal noise. If the tensioner does not move smoothly or you hear abnormal noise, replace the auto-tensioner.
6. Attach a torque wrench (A) to the pulley bolt. Align the indicator on the auto-tensioner housing with the edge of the indicator rib on the tensioner base by using the torque wrench, and measure the torque. If the torque valve is out of specification, replace the auto-tensioner.