THERMOSTAT

TM-5-6115-593-12 Power Plant Utility (MUST) Gas Turbine Engine Driven (AMERTECH Corp Model APP-1) Manual
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TM 5-6115-593-12 TO 35C2-3-463-1 4-80. THERMOSTAT. (See figure 4-53.) The thermostats are inside the thermostat housing mounted at the top front of the engine. a. Removal. Drain coolant and remove assembly (figure 4-53) as follows: (1) Remove bolts (1), washers (2), connection (3), gasket (4), bolts (5), and washers (6). (2) Loosen clamps (9), then remove outlet (7), tee (8), hose (10), and gasket (11). (3) Remove thermostat (13) and gasket (14) from housing (12). b. Test. (1) Suspend thermostat in a container of clean water. Thermostat must be must be completely immersed but not touching bottom of container. (2) Heat water gradually and stir so heat is evenly distributed. (3) Check temperature of water with reliable thermometer. Do not overheat. Observe thermostat as temperature increases. If the thermostat is functioning properly it should begin to open between 175 to 182°F (79 to 83° C) and be fully open at 205 F (96° C). (4) The thermostat is not adjustable. If it does not operate within the above limits, it should be replaced. (5) Install a new gasket (14) and thermostat (13) in housing (12). Be sure hole in thermostat is "up". (6) Install gasket (4), connection (3), washers (2), and bolts (1). (7) Secure gasket (11) and outlet (7) with washers (6) and bolts (5). Attach hose (10) with one clamp (9). Attach tee (8) with remaining clamp (9) and secure with washers (6) and bolts (5). (8) Refill cooling system; refer to tables 3-1 and 4-1. 4-81. COOLANT TEMPERATURE TRANSMITTER . (See figure 4-40.) To remove the coolant temperature transmitter, drain coolant into a suitable container by removing coolant drain plug and opening draincock. Refer to figure 4-54 and remove the nut, electrical lead, and washers; then unscrew the temperature transmitter from the water manifold. a. Inspection. Inspect transmitter for corrosion and leakage, and ensure that the connection is secure. The transmitter is not repairable and replacement is necessary when it fails to operate. If the engine is not overheating and unit shuts down as though it were, or if the engine continues to operate when running hot, the transmitter should be removed and tested as a possible cause of trouble. b. Test. The coolant temperature transmitter senses the temperature of the engine coolant to operate temperature indicator on control panel. (1) Suspend transmitter in a container of clean water. Transmitter should be inserted so that sensing element is completely immersed but connector end is out of water. (2) Set ohmmeter to Rx10 scale and connect ohmmeter between single conductor and case. Heat water gradually and stir so heat is evening distributed. (3) Check temperature of water with reliable thermometer. Do not overheat. 4-119

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