COVER AS 4176138 - Caterpillar

During the engine warm-up period and at frequent intervals while the engine is operating, the engine gauges should be observed for proper readings as explained in the following paragraphs:
GAUGES
1-Water temperature gauge. 2-Ammeter. 3-Diesel engine crankcase lubricating oil pressure gauge. 4-Fuel pressure gauge. Oil Pressure Gauge: Immediately after the engine has started, check the crankcase lubricating oil pressure gauge (3) to see that it is registering. When the engine is running at rated engine speed the gauge should register in the "Operating Range". A lower pressure reading is normal at low idling speeds. If no pressure is indicated, investigate at once. Water Temperature Gauge: The indicator on the water temperature gauge (1) should register in the "Operating Range". The water temperature regulators within the diesel engine cooling system are designed to give an approximate minimum coolant temperature of 160°F. (71°C.). The maximum operating temperature will vary according to the air temperature and load factor, but should never exceed boiling temperature at the prevailing altitude. Fuel Pressure Gauge: The indicator on the fuel pressure gauge (4) should register in the NORMAL (green) range. See the topic, CARE OF THE FUEL FILTER. Ammeter: On engines equipped with a charging generator the ammeter (2) should be checked to see that the indicator is registering in the charging range (indicator on the + side of zero). If the indicator registers in the discharging range (indicator on the - side of zero) investigate at once. If the ammeter shows no charge it may be that the circuit breaker is open. To close the circuit breaker press the reset button and again check the ammeter to see if it is registering in the charging range. When it is necessary to close the circuit breaker after each start, it indicates the voltage regulator is not functioning properly. See the topic, GENERATOR REGULATOR.