Has anyone worked on one of these cartridge type relief valves that they say you have to replace if it is weak. Im only getting 25psi instead of the 60 psi it call for. I know its the valve because if I plug the return to the oil pan the oilpressure easily passes 70 psi. Does anyone know how to take it apart to increase the spring tension or anything else to get it to operate at 60 psi again? Thanks for any ideas.