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dodge cummins oil pressure gauge problems
No matter what speed or temperature the diesel generator set is at, the oil pressure indicated by the oil pressure gauge is always lower than 0.05Mpa, and the oil pressure alarm light flashes.
The causes are detailed as follows:
The quantity and quality of engine oil do not meet the requirements. If there is too little oil in the oil pan; The oil becomes thin and deteriorated, and the viscosity decreases; The engine oil is mixed with water, diesel oil, diesel oil, etc.There is a serious leakage in the lubricating oil circuit, which makes a large amount of oil in the main oil passage flow back to the oil pan to relieve pressure. The leaking parts are detailed as follows: the process oil plug on the machine body is loose; Oil pipe is broken; The screw plug of the centrifugal purifying oil chamber of the crankshaft journal is loose; The fit clearance of spindle bearing or cam uranium bearing is too large. The oil pressure gauge and the sensing plug are out of order (remove the sensing plug wire and ground it directly. If the pressure returns to normal at this time, the sensing plug is faulty).
During the operation of Cummins generator set, the oil pressure suddenly drops to zero from the normal value. At this time, the machine should be shut down immediately for inspection, so as to avoid tile burning fault. The causes of sudden loss of oil pressure are detailed as follows:
When Cummins generator set operates at a steady speed, the oil pressure suddenly rises from the normal value 0.3-0.4Mpa, exceeding the pressure limit value of the pressure limiting valve 0.6-0.7Mpa, and sometimes the gauge needle points out of the scale. The main reasons are It should be pointed out that high oil pressure is not a good thing. It not only increases the load of the oil pump, but also keeps the safety valve open. The oil is directly sent to the friction surface without being filtered by the primary filter, which aggravates the wear of the friction pair; If the relief valve is stuck, the primary filter filter will be damaged and the main oil passage will be blocked by filter debris.
When the diesel generator set is cold (just started), the oil pressure is normal. With the increase of engine temperature, the oil pressure gradually decreases. The specific reason is that the oil viscosity decreases after the engine temperature rises, and the leakage loss of the lubricating oil circuit increases. This can happen if the engine oil deteriorates, the brand does not match, or the fit clearance between the main shaft journal and the bearing, or between the camshaft journal and the bearing is too large. The oil pressure of Cummins generator set is normal at medium and small throttle, the indicated value of the oil pressure gauge drops or even tends to zero after increasing the throttle, and the oil pressure tends to be normal after reducing the throttle.
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