I have an oil leak where the turbo oil drain inlet enters the block. The metal tubing elbow is actually loose, I removed it while trying to adjust it and see why it was loose. It appears to be a press fit into the block, no gaskets or O-rings. Has anyone ever had to replace this piece? I have two spares that I picked up from Cummins, but neither wants to slide in voluntarily. I would appreciate any help... Thanks!