The Most Common Engine Cooling System

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 Raw Water-Cooling Systems

Raw water-cooling systems draw water from outside the boat (seawater or lake water).
Water is pumped from the source to the engine block then the engine circulation pump forces the raw water thru the engine block and the water is expelled thru the exhaust.


On larger engines and inboard engines, the raw water pump is located inside the boat and is driven by a v-belt or directly off of the crankshaft.
There are hidden dangers that can accumulate over time causing you to spend big Dollars on repairs. The danger is using salt water as a coolant in your engine. Salt water can be highly corrosive.




Get here the Marine Diesel Engines Book where you can find all the information on this and many other topics.




Raw Water Pumps

This pump sucks water from the sea. It typically goes through a strainer as it is sucked towards the pump.

Saltwater Pump and Impeller Kit:





A flexible impeller pump provides an efficient solution to most raw water pumping needs.
The primary advantage of flexible impeller pumps is that they are self-priming, which means that when the vanes of the impeller are depressed and rebound, they create their own vacuum, drawing fluid into the pump. 



Learn more in the following video



Impeller Removal Tool

The impeller housing can be damage using screwdriver or inappropriate tools.


Impeller Plate: Clean the Plate carefully with sand-paper to avoid future leaks.
Don't try to replace the originals bolts by other similar aftermarket because the thread is different and always will have a leak.




Schedule a Video Call with Mr. Lopez for remote troubleshooting


Learn more about Marine Technical Training at www.mttedu.org


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