Summer 2001 had Morvyn Phillips, founder of Moonraker Owners Club, blocked a raw water intake to one of his engines, and discovered it to late, why the engine went overheated and which in the end lead to a break down with broken crankshaft and bended pistons.
Now, it is bad enough to have a broken down engine, which demands repair with expenses to mechanic and spares. - But if it is not possible to get spares, you're really in trouble! Because Morvyn had to realize, that Perkins was unable to provide him with spares, as the engines were outdated! He finally, after a lot of searching, solved the problem with used parts, but it expose a growing problem with our engines, being 25-30 years old.
And here we get to a point, which is important. The early Moonrakers were not fitted with raw water alarm, and if your Moonraker has no alarm, it certainly should be considered if not it would be an investment, which might save one for both inconvenience and money, if our luck runs out.
Here is a simple system based on Thermo Switches, which closes the circuit at 95* - 100*Celsius, mounted on the closed fresh water system. This demands that the fresh water is drawn off and the plates at the rear of the cylinder head is dismantled. Below you'll find wiring-diagram and the plates from the rear of the cylinder head.
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