Bob in Tennessee
Member
Ford 841 172 Gas Engine. Approx. 3 yrs. since I rebuilt engine and performance has been flawless. The last couple of uses I have seen my oil pressure fluctuate from 40 PSI to nothing. I had to get out a round bale and my pressure went out and I started getting a knocking. I dropped the pan, oil pump, ect. and started inspecting my bearings. All rods and mains were plasticgaged and checked out fine. All bearing were soaked in oil when removed and in good shape. Since they are out I will be replacing anyway. My question is what causes the damage to the outsides of center main bearing? Could it be that the crank is banging back and forth? There is a little daylight between the edge of crank journal sides and outside face of main bearing. Could this be the knocking sound I here? If so is there a cure? Right now my crank is in engine and I would prefer not to remove.