3.5 Installation of cooling system 3.5.1 Fresh water cooling system The diesel engine internal cooling system (freshwater system) is a closed circuit that is assembled in the factory. No additional installation or modification is required. 3.5.2 Sea water system The sea water pump sub assembly is supplied with this engine in a separate box. It is a centrifugal type, pulley driven pump. The input drive can be availed from the front end pulley of the engine through a B-type V-belt. User can install the pump on either side of the engine according to the design of the engine room. Ensure that the pump drive pulley and engine output pulley is aligned properly.
Fabricate the system pipe line only with anti-corrosive material. Reduce the length of the system pipelines and number of elbows to minimize the resistance of water flow. Dimension of the connecting lines (suction and delivery) should be same as per the pump design. Before priming/commissioning, make sure that the sea water supply line is completely flushed and clean so that the system is free from any metal obstacles or burrs. 3.6 Installation of diesel engine front end output The front end output pulley of diesel engine can be used to drive small-sized machinery, such as sea water pump, hydraulic steering pump and power take-off etc.
These units should be symmetrically arranged on two sides of the diesel engine so as to avoid the diesel engine crankshaft from being subject to unidirectional tension force. If it is necessary to drive large-sized machinery such as net-hauling machine, then, an elastic coupling must be used for connection. Refer figure 3.4 The installation should be conducted according to the requirements on aligning accuracy of different couplings as specified by the international standard. In service, its coaxial accuracy should be periodically checked to ensure the alignment of the coupling; otherwise it will lead to damage of parts and components of diesel engine. ELASTIC COUPLING Figure 3.4 9