Remove the drive belt.
(Refer to Timing System - "Drive Belt")
Remove the drive belt auto tensioner (A).
Tightening torque :
42.2 ~ 53.9 N.m (4.3 ~ 5.5 kgf.m, 31.1 ~ 39.8 lb-ft)
The tensioner pulley (B) bolt has left-hand thread.
Install in the reverse order of removal.
Check the belt tensioner for excessive foreign substances, crack, damage or sticking of pivot shaft. Replace if necessary.