NOTE: The N14 CELECT™ and CELECT Plus™ engines has one engine coolant thermostat and one aftercooler thermostat. The N14 STC engines have two engine thermostats and no aftercooler thermostat. The artwork in this procedure reflects the N14 CELECT™ engine but is representative of all the engines.

Install the thermostat into the cover.

Install a new gasket onto the thermostat housing.

Install the thermostat cover and mounting capscrews.

Tighten the capscrews.

Install the coolant temperature sensor into the thermostat housing.

Install the thermostat housing assembly and mounting gasket onto the rocker lever housing and onto the water transfer tube.

Inspect the transfer tube o-ring. Replace if necessary.

Install the mounting capscrews and washers.

Tighten the capscrews.

Install the upper radiator hose and the air compressor coolant return line to the thermostat housing.

Tighten all hose clamps.