CAM SLIPPING :
Sulzer RTA engine. While sailing, found No.1 unit exhaust temperature rising. Fuel valve changed, no improvement. Exhaust valve also changed, till found the exhaust temperature rising. Exhaust valve actuator checked, found OK. Exhaust valve timing checked, found different and on inspection, it was foun d that the cam has slipped by 90º,Same adjusted and brought back to normal. Engine tried out, satisfactory. The reason for this shifting of cam could not be found out.