Drive Belt Auto-tensioner Inspection

Special Tools Required

Belt tension release tool
Snap-on YA9317

 or equipment, commercially available
  1. Check whether there is a change in the position of the auto-tensioner indicator before starring the engine and after starting the engine. If there is a change in the position, replace the auto-tensioner.
  1. Check for abnormal noise from the tensioner pulley. If you hear abnormal noise, replace the tensioner pulley.

  1. 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.

  1. Clamp the auto-tensioner (A) by using two 8 mm bolts (B) and a vise (C) as shown. Do not clamp the auto-tensioner itself.
  1. Set the torque wrench (D) in the pulley bolt in the direction shown.
  1. Align the indicator (E) on the tensioner base with center mark (F) on the tensioner arm by using the torque wrench, and measure the torque. If the torque value is out of specification, replace the auto-tensioner.
    NOTE: If the indicator exceeds the center mark, recheck the torque.
    Auto-tensioner Spring Torque:
    32.5−39.7 N·m (3.31−4.05 kgf·m, 23.9−29.3 lbf·ft)