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Water Pump - Nissan Safari & Patrol with the venerable TD42 diesel engine.
Pro Tips: Water pump life is affected by factors such as coolant concentration and quality, belt tension, and operating environment and engine hours. Replacing the pump at the same time you're doing the timing belt and components saves on duplicated labour as well.
Coolant concentration in the cooling system should be at no less than 50% coolant, and 50% distilled water. We suggest using a 60/40 concentration since when an engine is flushed with clear water to remove the old coolant, some water is left behind that may reduce the effective concentration to below 50/50.
Coolant not only prevents overheating, it also provides lubrication for the water pump and has corrosion inhibitors in it to reduce internal engine corrosion and electrolysis as well as premature gasket failures (where gaskets are exposed to coolant - such as the cylinder head gasket).
Also, replace your rad cap at the same time... it's cheap insurance against overheating.
GMB - Made in Japan