A Series Diesel Engine Coolant System 55
The system is designed to use a specific quantity of
coolant. If the coolant level is low, the engine will run
hot.
1. The engine or system has a leak if frequent
addition of coolant is necessary. Find and
repair the leak.
Caution : The engine coolant passages must be
completely filled with coolant.
During operation entrapped air mixes with the coolant
which results in cavitation corrosion and poor heat
transfer. Highly aerated coolant can cause localized
overheating of the cylinder head and block which can
result in a cracked head, scored cylinder or blown
head gasket.
During filling, air must be vented from the engine
coolant passages. The air vents through the “jiggle
pin” opening and the notched vent hole to the top
radiator hose and out the fill opening. Additional
venting is provided for engines equipped with an after
cooler. Open the petcock during filling.
Caution : Never use only water for engine coolant. In
tropical climates where antifreeze
availability may be limited, use a corrosion
inhibitor (Cummins Liquid DCA) to protect
the engine cooling system.
A mixture of 50% ethylene-glycol base antifreeze is
required for operation of the engine in temperature
environments above
-37°C [-34°F]. A mixture of 40% water and 60%
antifreeze is recommended for temperatures below -
37 °C [-34°F].
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