I have low oil pressure and have to use 20W50 to keep the pressure above 30psi. The oil pressure sender was replaced a year ago I figure its worn bearings I got 110,000mi on the motor. Witch bearings rod or main or both would likely cause the pressure to drop? Also could the bearings just be replaced with out machining anything if their not to bad as a temp fix?

 

E-Man,

The main bearings, rod bearings, AND camshaft bearings are all related to oil pressure. The camshaft bearings can be replaced with the engine in the car if you are creative. However, worn camshaft bearings are not as common as worn main and rod bearings. You can replace the mains and rods if you can raise the engine enough to remove the oil pan. A quick inspection of the journals will reveal whether it is warranted or not. A standard set of bearings can usually be safely installed on an unground/unpolished crank with no adverse results, but that would only be a temporary repair at best. You may improve oil pressure and distribution by doing that, or maybe not. Since the crank would have to be dropped slightly to remove the uper shells of the mains, you might as well mic the crank and install the correct undersize bearing shells if possible. And if you go that far, and replacement crank may be just as easy. You'll see when you get that far.