Procedure for Filling Engine
During filling of the cooling system, air pockets may form. The system must be purged of air prior to being put
in service. This is best accomplished by filling with a pre-mix solution. Refer to Figure #7-3 for proper fill level.
Figure #7-3
Caution: Do not overfill cooling system. A pressurized system needs space for heat expansion without
overflowing.
Partial Fill
Install the pressure cap, start and run engine for approximately 5 minutes in order to purge the air from the
engine cavities.
When verifying that the coolant is at a safe operating level, it is best to wait until the engine temperature drops
to approximately 120ºF (49ºC), or lower, before removing the pressure cap.
Remove the pressure cap and refill to the proper fill level. To continue the deaeration process start and run
engine until the temperature stabilizes at approximately 160°-200° (71°-93° C) or run engine for 25 minutes,
whichever is longer. During this warming process, you may see coolant coming from the overflow tube
attached at the pressure cap location. Allow engine to cool, then remove the pressure cap and refill to the
proper fill level.
Caution: Do not remove pressure cap while coolant is at normal operating temperatures. Possible personal
injury could result from the expulsion of hot coolant.
Providing Adequate Raw Water Supply to the Engine Heat Exchanger
Raw Water Supply
Most Clarke diesel engine fire pump drivers are heat exchanger cooled and some engines also have a charge
air cooler (CAC) that uses raw water to cool the air before entering the intake manifold. If you have a radiator
cooled Clarke engine, you can disregard this section. Heat exchanger cooled diesel engine drivers require a
clean source of pressurized water from the discharge side of the fire pump in order to keep the engine from
overheating by providing a specified minimum amount of raw water flow.
Cooling Loop
NOTE: Engine may include a cooling loop as an optional feature and has not been evaluated by UL as part of a
UL Listed fire pump driver.
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