A closeup of the adjusting and indicating features of the temperature regulator is shown in figure 3-10. The procedure for adjusting a temperature regulator is as follows: Rotate the manual crank pin until the indicator pointer is in

Figure 3-10.Scale and Indicator plates of temperature regulator.

the THERMOSTATIC POSITION. Turn the adjusting wheel until the pointer is opposite 2 on the scale plate. Loosen the locknut and unscrew the valve stem until it is free of the thermostatic stem. Then turn the adjusting wheel until the pointer is opposite 8 on the scale plate. (Note: The preceding steps should be performed with the ther-mostatic bulb removed from the ships piping and when the bulb temperature is below 100F.) Again rotate the manual crankpin until the lower end of the seating sleeve is flush with the lower end of the thermostatic stem. With the seating sleeve and the indicator pointer in this position, loosen the screws in the indicator plate and slide the plate up or down as needed to align the THERMOSTATIC mark in the center of the plate with the indicator pointer. Then retighten the screws. (The marks COOLER CLOSED and COOLER BY-PASS on the indicator plate are only approximate.) Screw the valve stem into the thermostatic stem and turn it until the cooler pop-pet valve seats firmly. Turn the adjusting wheel until the pointer is opposite 2 on the scale plate.

Turn the valve stem one full turn into the thermostatic stem and retighten the locknut.

With the manual control on the THERMOSTATIC position, turn the adjusting wheel in a direction to bring the pointer to number 9 on the scale plate. Run the engine at warmup speed until the temperature of the fluid, as indicated by the thermometer in the line with the thermostatic bulb, rises to the desired temperature. (The desired temperature must be determined in advance from applicable instructions.)

With the engine running at warmup speed and the temperature at the thermostatic bulb at the desired value, turn the adjusting wheel until the cooler poppet just begins to leave its seat. This action is shown by the movement of the mark on the valve stem downward from the COOLER CLOSED mark on the valve position indicator. Valves adjusted in accordance with this procedure will normally maintain the temperature of the fluid at the thermostatic bulb between the desired value and a temperature approximately 20 higher, under any conditions of engine load or injection temperature. This 20 difference is the temperature rise required to cause the poppet valve to move through the necessary travel.