Check the condition of all of the gauges. If a gauge is broken, repair the gauge or replace the gauge immediately.
Record the Data and Review the Data
Check the oil pressure and the fuel pressure on an hourly basis during normal operation. Record the data in a log. Compare the new data to the data that was previously recorded. Comparing the new data to the recorded data will establish the normal gauge readings for the engine. A gauge reading that is abnormal may indicate a problem with operation or a problem with the gauge.
Normal oil pressure at low idle rpm and at operating temperature is 172 kPa (25 psi). Normal oil pressure at rated rpm and at operating temperature is 448 kPa (65 psi).
Oil Filter Differential Pressure
Replace the oil filter elements when any of the following occur:
- The engine is operating at rated speed and at operating temperature and the oil filter differential pressure reaches 103 kPa (15 psi).
- The engine oil is changed.
- The oil filter elements have been used for 1000 hours of operation.
The typical fuel pressure range is from 415 kPa (60 psi) to 676 kPa (98 psi).
Fuel Filter Differential Pressure
Replace the fuel filter elements when either of the following occur:
- The engine is operating at rated speed and at operating temperature and the fuel filter differential pressure reaches 69 kPa (10 psi).
- The fuel filter elements have been used for 1000 hours of operation.
Replace the soot filter when the air restriction reaches 3.7 kPa (15 inches of H2O). If the air restriction exceeds this limit, excessive fuel consumption and exhaust temperatures will result.