Low Oil Pressure

[Carl Riederer]

2019 X15 This truck had oil pressure issues in the past. Had to change the oil filter at about 10,000 miles to make it to the oil change. Put a new oil pump in it and that didn't fix it. Did an overhaul and the oil pressure came up and could go a full service without having to replace the oil filter mid-way. Just over a year later it spun a rod bearing. Pulled the engine out and did a full rebuild. Sent the block to a machine shop to be cleaned and checked. We also blew all the ports out. Installed a new crankshaft from {after-market}. One new rod, new head, both gears and hubs in the front, oil pump, oil cooler, oil thermostat, and overhaul kit. When the truck is up to full operating temp the oil pressure will drop to 12psi at idle. Checked with a manual gauge and it is reading correctly. Installed a new set of bearings from Cummins, another oil pump from Cummins and tried one from {after-market}. Installed new piston nozzles from Cummins. Ran it with the valve cover off nothing leaking on the top end. Replaced the oil filter again and the relief valve in the filter head. The oil filter is a filter that we use on other X15s with no issues, so not the brand of filter. Double checked the engine serial #, overhaul kit #, oil pump #, bearing #s, and the piston cooler #s. Checked the oil pickup tube. Can not find the issue.