33
Figure #14
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
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 flywheel housing. Ref. Figure #15.
Contact Clarke for an optional breather kit if vapors
accumulate in your pump room.
Figure #15
3.2.5 Exhaust System
Excessive back pressures to the engine exhaust can
considerably reduce both engine performance and life.
It is important that exhaust systems are the proper
diameter, as short as possible, and with a minimum of
bends. Refer to Installation & Operating Data (See
www.clarkefire.com) for exhaust data. Also refer to
the table below for maximum exhaust restrictions.
Engine model
Exhaust
backpressure limit
(inches of water)
C32H0-UFAC60
27
C32H0-UFAC50
C32H0-UFAC40
C32H0-UFAC30
C32H0-UFAC20
C32H0-UFAC10
C32H0-UFAC68
22
C32H0-UFAC62
C32H0-UFAC58
C32H0-UFAC52
C32H0-UFAC48
C32H0-UFAC42
C32H0-UFAC38
C32H0-UFAC32
C32H0-UFAC28
C32H0-UFAC22
C32H0-UFAC18
C32H0-UFAC12
The installation of the exhaust system should consist of
the following:
Personnel protection from hot surfaces.
Adequate supports to prevent strain on the
engine exhaust outlet and minimize vibration.
Protection against entry of water and other
foreign matter.
While the engine is running inspect exhaust pipe outlet
outside of the pump room itself for environmental
hazards such as excessive smoke conditions. The
following could be used as a guide for general engine
operating conditions.
1) Blue Smoke – Possible engine oil
consumption.
2) White Smoke – Possibility of water in
cylinders, water in fuel or internal engine
problem.
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