As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED TURBO CHARGER CHECK VALVE AND INSTALLED IN CORRECT ORIENTATION. RAN ENGINE AND THE TURBO CHARGER CAVITATED DUE TO LOSS OF OIL SUPPLY. FURTHER INVESTIGATION REVEALED THE NEW CHECK VALVE WAS BACKWARDS INTERNALLY IE: THE CHECK VALVE WAS AT THE OPPOSITE END OF THE FITTING AND FLOW ARROW COMPARED TO THE ORIGINAL CHECK VALVE. RECOMMEND THAT ALL CHECK VALVES BE EXAMINED TO VERIFY PROPER PHYSICAL FLOW DIRECTION AND PROPERTIES. (K)