SCREW ASSEM. 1M1831 - Caterpillar

This procedure is intended to give information on testing the water temperature regulator.Test Preparation
Drain the cooling system to a level below the water temperature regulator housing.
Remove the water temperature regulator from the water temperature regulator housing. Note: Refer to the literature that is supplied by the OEM of the water temperature regulator for the opening temperature and opening distance of the water temperature regulator.
Heat water in a pan until the temperature is equal to the opening temperature for the water temperature regulator. Test Procedure
Personal injury can result from escaping fluid under pressure.If a pressure indication is shown on the indicator, push the release valve in order to relieve pressure before removing any hose from the radiator.
Hang the water temperature regulator in the pan of water. The water temperature regulator must be below the surface of the water and away from the sides and the bottom of the pan.
Keep the water at the correct temperature for ten minutes.
After ten minutes, remove the water temperature regulator. Immediately measure the opening in the water temperature regulator. If the opening agrees with the distance that is specified by the OEM of the water temperature regulator, the water temperature regulator is operating properly.If the distance is less than the distance that is specified by the OEM of the water temperature regulator, obtain a new water temperature regulator.If the distance is less than the amount listed in the manual, replace the water temperature regulator.