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Dearfield Co. | The pressure bypass on the pump can get a weak spring over time. I would probably take it off and take it part and insect the gears and make sure they aren't wore excessively while I was there and look at the end plate where the gears run as they can wear excessively losing pressure. If it looks ok put it back on a pressure the engine up thru one of the ports with clean engine oil and then get under it and look for excessive flow. Make sure you have a good face shield and prepare to get a little oily I always wear a big trash sack with a hole for my head and arms. Sometimes things will look ok but be destroyed to where it dumps excessive oil and pressure out. The suction lines as well as the pickup tube in the pan can also crack allowing it to draw air. Most of the ones I have seen cracked is in the middle of the tube on a seam in the tube----------Good luck | |
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855 cummins oil pressure problems
