The Cummins/Onan MAJ is an engine rated at 3600 rpm. It powers generator sets from Cummins/Onan, including the 2.5MAJ.
| Rated speed | 3600 rpm |
|---|
| Symptom | Cause | Remedy |
|---|---|---|
| Low Oil Pressure | Check the oil level. If low, add oil to bring level up to 1 /4 inch (6 mm) from the fill opening. Do not overfill. Inspect engine exterior for leaks and repair as necessary. | The oil pressure switch grounds the ignition circuit if pressure drops below 8 to 10 psi (55 to 69 kPa), and causes genset shutdown. |
| High Engine Temperature | Check condition and tightness of the sea water pump belt. Sea water flow at the hull exhaust outlet for a new pump should be about 1.8 gal/min (6.8 L/min) for 60 hertz gensets, and 1.5 gal/min (5.7 L/min) for 50 hertz gensets. Also check cooling system for freedom of contaminants, rust and sludge build-up, etc. | The thermostat switch closes at engine temperatures over 200' F (93' C) and grounds the ignition circuit to cause genset shutdown. |
| High Exhaust Temperature | High exhaust manifold temperature is caused by failure of the sea water cooling system. Failure can be caused by a defective sea water pump, drive belt, plugged inlet filter, or a closed water valve. | Sea water flow at the exhaust outlet should be as referenced in the High Engine Temperature text. Whenever a shutdown occurs, a thorough inspection of the complete exhaust system must be made by an experienced service person. |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
The Cummins/Onan MAJ powers 1 generator set(s), including Cummins/Onan 2.5MAJ.