Changing The Setting Without Understanding The Problem

An 20year old ship was in transit from UAE to Mumbai. All were going good and suddenly Exhaust temp went up. Adjusted fuel rack and kept Exhaust temp under control, after 1day again found Exhaust temp increasing. It was decided to change the exhaust valve and stopped the engines in mid sea, changed the exhaust valve with overhauled one, started the ME engine it was found not starting. Struggled for 2days, and made engine alright