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4.10 Cooling system
A properly designed and installed cooling system is vital to satisfactory engine life.
Engines using a liquid for cooling have jackets or passage around each cylinder and throughout the
cylinder head. The coolant enters the jacket under pressure and on its way to the outlet absorbs heat from
the engine. Liquid cooling systems are designed so that the engine inlet and outlet temperature differential
is maintained at desirable level in the range of 8
0
C to 10
0
C. At the outlet the coolant enters a radiator
comprising of small finned tubes. These fins provide a large surface area for transfer of heat from liquid to
the air stream. The air stream is produced by a pusher type radiator fan which draws air over the engine
and 'pushes' it through the radiator. The cooled liquid is then again re-cycled for engine cooling.
All diesel generating sets using liquid-cooled engines are provided with set mounted radiator, correctly
matched with the engines to maintain the engine liquid temperature at the desired level. However, for
correct functioning of the cooling system free flow of cool air to the radiator core and free flow of air away
from the core must be ensured. Radiator and fan alignment is crucial for effective cooling system.
Fan should be mounted completely inside the radiator shroud and should be flush with the shroud bore.
The figure below shows the schematic diagram of the cooling system.
The cooling system consists of :
• Water pump
• Radiator
• Radiator Fan
• Thermostat
• Compensating bottle
It is recommended use K Cool Super Plus in cooling system.
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