What was found
AFTER TAKEOFF DURING CLIMB-OUT, PILOT NOTICED FINE SPRAY OF OIL MIST FROM RT ENGINE OUTBOARD SIDE AND TRACE OF OIL LEAK BEGIN TO FORM. PILOT MADE AN UNEVENTFUL LANDING AND ENGINEERING INVESTIGATION WAS CARRIED OUT. NR 3 CYLINDER EXHAUST PUSHROD LOCKING CLIP HAD UNLOCKED ALLOWING SEAL TO LEAK OIL DUE TO A LOOSE SHROUD TUBE. SUBMITTER RECOMMENDATION: TO WIRE LOCK WITH SAFETY WIRE IN PAIRS THE LOCKING CLIPS OF THE INDIVIDUAL SHROUD TUBES FOR EVERY CYLINDER.