TM 5-4320-300-14Table 4-2. Organizational Maintenance Troubleshooting - ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONWARNINGHot coolant may be released when radiatorcap is removed. Allow engine to cool beforeremoving cap. Open cap part way to ensurethat pressure in cooling system is released,then remove cap.a. Remove and test the thermostat. Remove radiator cap and open draincock at bottom right ofradiator. Drain the cooling system to a level where the coolant is below the thermostat.Disconnect the radiator hose at water outlet elbow after loosening clamp. Remove bolts,lockwashers, water outlet elbow, gasket, and thermostat. Check the operation of thethermostat by immersing it in a container of hot water. Place a thermometer in the container,but do not allow it to touch the bottom. Agitate the water to maintain an even temperaturethroughout the container. As the water is heated, the thermostat should begin to open whenthe temperature reaches 167-172°F (75-78°C). The opening temperature is stamped on thethermostat.-The thermostat should be fully open at approximately 190-192°F (88-89°C).If thermostat is faulty, replace it. Remove any old gasket from gasket surface of thermostathousing and the water outlet elbow. Install new gasket and position water outlet elbow. Installmounting bolts and lockwashers. Tighten bolts to 23-26 ft-lbs (31-35 N•m). Position upperradiator hose on water outlet elbow and tighten hose clamp snugly. Pour collected coolantback into radiator and install radiator cap. Start engine and check for leaks. If leaks appear,tighten hose clamp on water outlet elbow.4-46
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