Place the thermostat in the block.
Install the thermostat (B) with the jiggle valve upward.
Install the new O-ring (B).
Install the water inlet fitting (A).
Tightening torque :
18.6 ~ 23.5N.m (1.9 ~ 2.4kgf.m, 13.7 ~ 17.4lb-ft)
Fill with engine coolant.
Start engine and check for leaks.