CYLINDER HEAD GP 8N6796 - Caterpillar

Gauges provide indications of engine performance. Ensure that the gauges are in good working order. Determine the normal operating range by observing the gauges over a period of time.Noticeable changes in gauge readings can indicate potential gauge or engine problems. Problems may also be indicated by gauge readings that change even if the readings are within specifications. Determine and correct the cause of any significant change in the readings. Consult your Caterpillar dealer for assistance.Your engine may not have the same gauges or all of the gauges that are described below.
If no oil pressure is indicated, STOP the engine. The engine will be damaged from operating without oil pressure.
Engine Oil Pressure - This gauge indicates the pressure of the engine oil. The engine oil pressure will be highest after a cold engine is started. The engine oil pressure will decrease as the engine warms up. The engine oil pressure will increase when the engine rpm is increased. The engine oil pressure will stabilize when the engine rpm is stable. The typical range for engine oil pressure at low idle rpm is 186 to 344 kPa (27 to 50 psi). The typical range for engine oil pressure at rated rpm is 275 to 600 kPa (40 to 87 psi).
Oil Filter Differential Pressure - This gauge indicates the difference in pressure between the inlet side and the outlet side of the engine oil filters. As the oil filter elements become plugged, oil filter differential pressure will increase. Replace the engine oil filter elements when the oil filter differential pressure reaches 105 kPa (15 psi).
Jacket Water Coolant Temperature - This gauge indicates the temperature of the engine coolant at the outlet for the jacket water. The jacket water coolant temperature may vary according to the load. The jacket water coolant temperature should never be allowed to exceed the boiling temperature of the pressurized cooling system. The operating range for jacket water coolant temperature is 88 to 100 °C (190 to 210 °F). Higher temperatures may occur under certain conditions.The engine should operate within the normal temperature range. The sensor for jacket water coolant temperature must be fully submerged in order to detect the temperature correctly. If the engine is operating above the normal temperature range, perform the following procedure:
Reduce the load and the engine rpm.
Inspect the cooling system for leaks.
Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load and rpm.
High inlet manifold air temperature increases the risk of engine damage. Maximum inlet air temperature is 115 °C (235 °F).
Inlet Manifold Air Temperature - This gauge indicates the inlet manifold air temperature to the cylinders. The sensor for inlet manifold air temperature is located after the aftercooler.Maintain the aftercooler in good condition. Ensure that the inlet manifold air temperature of an engine at operating temperature does not vary by more than 4 °C (7 °F) from the maximum inlet manifold air temperature.
Inlet Manifold Air Pressure - This gauge indicates the air