Install in the reverse order of removal.
Tightening torque
21 Nm (2.1 kgf-m, 15.2 ft-lb)
Note. The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.