What was found
OIL LEAKING OUT OF TURBO CHARGER AFTER ENGINE SHUTDOWN, ENGINE HAD NOT BEEN RUN SINCE CHECK VALVE HAD BEEN INSTALLED. REMOVED OIL PRESSURE CHECK VALVE FOR INSPECTION, AND NOTED LOOSE NUT, TOTALLY SEPARATED INSIDE THE CHECK VALVE. THIS OBVIOUSLY WAS THAT WAY WHEN IT WAS INSTALLED AS A NEW PART. (K)