Getting to the core of the problem
Since the time we made our first passage on the Amel, I have been unconvinced that the cooling system on our Perkins diesel has been working as well as it should be. Even though we seem to be getting good water flow from the exhaust, I only seem to be able to keep the engine temperature (measured on the gauge, not a heat gun) within the operating range if I run the engine at a lower RPM than it is rated for. With no plans to sail her anywhere in the next little while, yesterday seemed to be as good a time as any to look into the situation.
Our engine is a Perkin’s 4.154.
Schematic diagram for the cooling circuit.
I changed the impeller on the water pump back in September.
The core from the heat exchanger. I sent it off to be cleaned and pressure tested.
There’s always 1 nut that takes as much time to remove as everything else!
Now I know why that foam is there… to rest your head on.
Making thermostat soup?
The thermostat on the right is the one that was in the engine. It failed to open!
The one on the left is a spare that I found on the boat. One problem found.
I really should learn to wear gloves!