Entec EW-4200D - Raw Water Cooling System

16710 SW 72nd • Portland, Oregon 97224 • (503) 624-7118
Entec West, Inc.
6
System Descriptions EW-4200D
RAW WATER COOLING SYSTEM
The Raw Water Pump (rear half of 15/1) draws outside raw water
from the sea cock and strainer and pushes it through a hose
Raw Water Inlet
(16/13), into the Heat Exchanger (16/1). As it passes through the
Heat Exchanger it absorbs heat from the fresh water coolant.
The raw water is then discharged into the Exhaust Elbow where it
is sprayed on the hot exhaust gases to cool them. It then flows
with the exhaust gas into the typical “wet marine” exhaust system.
CAUTION
Whenever the engine is cranked, the Raw Water Pump
continues to pump water through the raw water system.
With continued cranking, it is possible to fill the Exhaust
Percolating Muffler, the Exhaust Hose, the Exhaust Elbow,
and if the Exhaust Valve is open, the engine combustion
chamber, with raw water. If the raw water is sea water, the
damage to the engine can be severe. If this ever happens,
corrective action must be taken at once. If the engine will
not start within 7 to 10 seconds, stop cranking!
Raw Water Outlet
Heat Exchanger Inlet
Exhaust Elbow Inlet