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Note: Intake Air Shutoff Valve - Engine may include an intake air shutoff valve as an optional feature that is activated by
an overspeed event and provides a positive shutoff of combustion air to the engine. The optional air intake shutoff
valve has not been evaluated by UL as part of a UL Listed fire pump driver.
Crankcase Ventilation
Vapors that form within the engine are removed from the crankcase and gear train compartment by a continuous,
pressurized ventilation system. A slight pressure is maintained within the engine crankcase compartment. Vapors are
expelled through a vent pipe attached to the rocker cover. Ref. Figure #5-1. Contact Clarke for an optional breather kit
if vapors accumulate in your pump room.
Figure 5-1
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