Remove the drive belt.
(Refer to Timing System - "Drive Belt")
Remove the idler (#2).
(Refer to Timing System - "Idler")
Remove the drive belt tensioner (A).
Tightening torque :
25.5 ~ 30.4 N.m (2.6 ~ 3.1 kgf.m, 18.8 ~ 22.4 lb-ft)
Installation is reverse order of removal.