1940 110 Touring Sedan Irregular Oil Pressure

Posted by Joe On 2023/5/8 22:10:50

Looking for some help. I purchased a 1940 110 project car about five months ago and have been working on it since. The engine was stuck from sitting but no visible damage to the cylinders. I did all the basic stuff including dropping the oil pan, replaced the head gasket, rebuilt the brakes, generator, starter etc…My question is this. I removed the oil pump, cleaned it and reinstalled it. Oil pressure at a cold start was always 25 to 28 psi. At warm idle it would drop to about 20psi (SAE 30 weight oil). I realize pressure is low but what makes no sense to me is that lately driving the vehicle around the block a few times pressure drops considerably and does not return to 25 to 28 psi for the next cold start. It appears as though under load with acceleration the oil pressure does not increase but instead drops. I installed a mechanical gauge and have seen it drop to 4 to 6 psi under load. I’m wondering if there could be a problem with the pump or could I have made a mistake with it during reassembly. I also think I probably have a stuck ring because the car is burning oil and has a misfire in cylinder #6. It starts right up though and runs pretty smooth. I plan to pull the head again and go after the rings. Before doing that I figured I should confirm the oil pump is working properly. Any suggestions would be greatly appreciated.