THERMOSTAT

SHAFT AND BEARING

Figure 5-lnstolling Water Pump Shaft and Bearing

2. Press the seal into the housing as shown in

Figure 6, using a suitable adapter to press against the shoulder of the seal.

3. Press the impeller on the shaft. When the rear face. is nearly flush with the housing, check the clearance between the rear of the impeller and the face of the housing. Use a straight edge and feeler gauge. The clearance should be 0.015 to 0.025 inch. This is necessary to prevent the impeller from rubbing on the pump cover during operation.

4. Place the pulley hub fan mounting face on the base of an arbor press. Place the shaft (previously pressed into the pump body and impeller) into the pulley end of the hub. Position a short piece of :;;8 or 1/2 inch rod between the arbor press ram and the impeller end of the shaft, then press the shaft into the hub. Be careful not to push against the impeller, since this might move it out of its proper position on the shaft. figure 6- lnstamng Seat in Housing

NOTE: When correctly installed, the pulley hub shoultZ just dear the shaft bearing, with· out any bind.

5. Install the pump cover and a new gasket, and s«ure with the three bolts.

D. Installation

1. Position a new gasket on the pump body, then attach the pump to the cylinder block with the three bolts and lockwashers. Tighten the holts to 10-15100. torque.

2. Connect the hose, close the radiator drain cock, and fiU the radiator with coolant suitable for the prevailing temperature.

3. Install the fan and generator belt and adjust the belt tension to 1/4" deflection under 15-20 100. pressure, Figure 7.

The thermostat used in the Ford Tractor is a spring and cartridge type, and is mounted in the cylinder head water outlet elbow. The thermostat regulates the temperature in the cooling system by controlling the flow of coolant through the system. When the engine is cold, the thermostat is closed and the coolant does not circulate through the radiator. As the engine warms up, the thermostat gradually opens, and is funy open at normal operating temperature.

The thermostat on gasoline or LP-Gas models should start to open at 157 0 to 162°F. and be fully open at 177° to 182"F. The thermostat on four diesel models start to open at 178" to 182"F. and be fully open at 202"F.