The whole “engine cuts out in warm waters/weathers” sounds fishy to me.
? Seawater worldwide runs between 32 and 95F.
A narrow range for a gas turbine with an operating exhaust temp around 1000F ??? https://www.seatemperature.org/
Yes, fishy.
Fishy, indeed. I worked on a contract to deliver fifty 1500-2500DWT short sea ships to Iran during the Iran-Iraq war. All of these ships traded mostly in the Baltic and North Seas, and few ever sailed south of Bordeaux.
I had worries as to how they would perform in the Red Sea and Persian Gulf with water temperatures of 28C-32C. However, in nearly every case, the heat exchangers were adequate once the regulating valves were opened up. In the cold seas, the jacket water pump bypasses were opened to reduce flow through the exchangers and keep the jacket water temps high enough. The ships were designed to operate world-wide.
The only trouble I encountered on some ships was that the turbocharger after coolers did not drop the charge air temperature sufficiently, but I was only delivering them to parties who likely did not know the difference, so I made no effort to correct that.
In the case of these RN ships, it does seem that the overheating could be easily addressed by installing larger or additional heat exchangers, which are available off the shelf or can be fabricated at no great expense. Navies, however, are not so keen on simple solutions.