You can see the heat exchanger situated underneath the generator in the picture below. I consider that poor design and changed my heat exchanger location which you can read about here and also here
To change my cooling system, I figured it was only a case of changing a few hoses over and I could have both my generator casing AND my engine cooled by fresh water and use the raw water only for cooling through the heat exchanger. Read below how I did it...
|FP blurb about their water cooling.|
Next I removed the hose from the raw water pump which goes straight down to a pipe that dives under the motor to the generator casing.
The idea is to swap these two over. Fresh water will now go to the generator casing, and raw water to the heat exchanger.
Now, at the heat exchanger. the pipe that use to be fresh water is now raw water and should be connected to the raw water input at the heat exchanger.... AND the raw water input hose at the heat exchanger is now fresh water. Just swap the two over.
So, lets follow the path of the fresh water first.
From the fresh water pump, it goes down beside the crank pulley and dives under the motor to the generator casing. From the generator casing, the fresh water goes to the heat exchanger to be cooled and then returned to the engine at the header tank. From the header tank, it gets circulated around the engine and repeats the cycle.
Now the raw water.... It leaves the raw water pump and goes straight to the heat exchanger; picks up the heat and then exits via the exhaust. Just like the new FP's.
|Finale hookup with generator belt back on.|
We also have a fresh water flush system for both our engine and Genset. As we get ready to shut them down for a while, we open a valve to our fresh water tank and close the sea cock. We let the engine run for a minute or two and this then flushes out the seawater from the heat exchanger. Thus prolonging the life of the heat exchanger. Then, after shuting down the motor, it is important to close that fresh water valve; otherwise, the next time you open the sea cock, it can back pressure to the fresh water and ruin your tank supply. It usually only happens once. :-D
All up, it took about 2 hours and a ten dollar item to complete. Antifreeze and Salt-X were extra costs; but you should replace you antifreeze once a year anyway. It's mostly for the anti corrosion properties that we use it.The engine actually runs slightly cooler, and with a trip up to the tropics soon, will be beneficial.