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Certain local codes may not allow you to discharge the waste water outlet from the engine heat exchanger
either due to its temperature or it now being considered hazardous waste. It is recommended you always check
local codes regarding waste water discharge.
NSR Heat Exchanger Maintenance
The NSR heat exchanger tube bundle can be removed and cleaned to maintain proper cooling and flow
requirements. The cleaning procedure should be performed on an as needed basis. Refer to section 9.6.
Flow Paths of Engine Cooling System
The engine coolant flows through the shell side of the heat exchanger (or radiator), engine coolant pump, oil
cooler, turbo chargers, engine block and cylinder head, jacket water heater, thermostat, expansion tank, and
coolant recovery tank (if equipped).
On heat exchanger equipped engines raw cooling water flows through the tube side of the charge air cooler, if
equipped, and the tube side of the heat exchanger.
Refer to Figures #7-6 for heat exchanger cooled engines and #7-7 for radiator cooled engines for cooling
system flow path diagram.
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