What was found
DURING ENGINE OVERHAUL, IT WAS DISCOVERED THAT THE OUTER INTAKE VALVE SPRINGS ON CYLINDERS 1, 3, AND 4 WERE BROKEN INTO 2 OR 3 PIECES. BASED ON THE APPEARANCE OF THE FRACTURE SURFACE AND THE WEAR ON THE NEW WEAR SURFACES (THE SPRINGS HAD SCREWED THEMSELVES TOGETHER) OF THESE SPRINGS, THESE FAILURES WERE NOT RECENT. NOTE: SN OF ALL 3 CYLINDERS ASSEMBLIES ARE 13408-1, 13467-11, AND 13467-26. THE CYLINDER ASSEMBLIES WERE NEW WHEN INSTALLED ON THE ENGINE IN 2004.