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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.
3.2.4 Crankcase Ventilation
3.2.4.1 DP6H, DQ6H – Open Crankcase Ventilation
(Refer to Figure #16)
Vapors which may 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 expelled through a
vent pipe attached to the rocker cover breather
element. Ref. Figure #16.
Figure # 16
3.2.4.2 DR8H, DS0H, & DT2H – Crankcase
Ventilation System
A crankcase ventilation system allows for the
recirculation of vapors (expelled through a vent pipe
attached to the rocker cover breather element) to the
combustion air inlet. Refer to Figures 17A, 17B,
17C, & 17D.
Figure #17A- DR8H / DS0H models
Figure #17B – DR8H / DS0H models
Figure #17C
Figure #17D
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