A Series Diesel Engine Coolant System 57
Air in the coolant can result in loss from the overflow
when the aerated coolant is hot. The heated air
expands, increasing the pressure in the system
causing the cap to open.
Similarly, coolant can be displaced through the
overflow if the head gasket leaks compression
gasses to the coolant system.
The operating pressure of the coolant system and the
lubricating system can result in mixing go the fluids if
there is leak between the systems: head gasket, oil
cooler, etc. (refer to the Lubricating System).
Note: Transmission fluid can also leak into the
coolant through bottom tank oil coolers.
Water (Coolant) Pump
The water pump pulls coolant from the bottom of the
radiator and pumps it through the engine back to the
top of the radiator for cooling. Reduced or interrupted
flow will result in the engine running hot.
The pump is belt driven from the crankshaft pulley.
An belt tensioner is used to prevent the belt from
slipping on the pump pulley.
A malfunction of the tensioner will cause the water
pump impeller to rotate at a slower speed reducing
the amount of coolant flow.
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