9)
Cleaning the heat exchanger pipe
If the heat exchanger pipe through which the raw water flows becomes
extremely dirty, the cooling affect deteriorate.
If the C.W. warning lamp lights periodically when the engine is run at the rated
output, clean the pipe in the heat exchanger with a cleaning agent and then flush
the accumulated scale produced by cooling the raw water from the pipe.
10) Cooling water leakage check during operation
Although checking for water and oil leakage during operation is generally
necessary, check for fresh water leakage with special care.
Fresh water leakage is directly related to seizing of the engine.
11) Anticorrosive zinc
Each fresh water cooler is provided with anticorrosion zinc to prevent electrolytic
corrosion by the cooling water.
Replace the anticorrosion zinc after every 500 hours of use.
Although it depends on the quality of the raw water and the operating conditions,
remove the scum (dross) adhering to the surface of the anticorrosive zinc.
If less than 1/2 of the anticorrosive zinc is left, it should be replaced with a
new one.
23.