What was found
(CAN) AIRCRAFT WAS EXPERIENCING PROBLEMS WITH THE MANIFOLD PRESS ON THE RT ENG & DURING TROUBLESHOOTING IT WAS FOUND THAT THE RT ENG NR 4 CYLINDER INTAKE TUBE IN THE AIR BOX WAS DISPLACED. THE OH MANUAL STATES THAT IT`S PRESS FIT, THEN SWAGED INTO PLACE. AFTER OPENING THE SUMP INTAKE MANIFOLD BOTTOM PLATE IT WAS DISCOVERED THAT THE CLAMP HOLDING THE INTAKE TUBE FOR NR 4 & 3 CYLINDER WAS LOOSE. THIS WAS CAUSED BECAUSE THE INTAKE TUBE WAS INSTALLED 90 DEGREES CLOCKWISE & OF THE SHAPE OF THE INTAKE TUBE IT WAS CONTACTING THE UPPER PORTION OF THE MANIFOLD & LOWER PORTION OF THE OIL SUMP MAKING A GOUGE. OVER TIME IT ROTATED BACK TO A NORMAL POSITION & WAS THEN SITTING LOOSE IN THE CLAMP WHICH IS LIKELY WHAT CAUSED THE SWAGE TO FAIL. THE SUMP GOUGE IS MEASURED AT .059 INCHES.