Excerpts from the Toyota Manual
- Check that belt tensioner moves downward when the drive belt is pressed down at the points indicated in the illustration with approx. 98 N (10 kgf, 22.0 Ibf) of force.
- ... operate drive belt tensioner 3 times with full stroke. HINT: Take 3 seconds or more for 1 full stroke.
- Check the alignment of the belt tensioner pulley to make sure the drive belt will not slip off the pulley. If necessary, replace the belt tensioner. Check the belt tensioner operation.
After installing a belt, check that it fits properly in the ribbed grooves. Check with your hand to confirm that the belt has not slipped out of the groove on the bottom of the pulley.
After installing a new belts, run the engine for about 5 minutes and check the belt tension.