Regal 3300 Owner's Manual page 94

CHAPTER 3
Engine Ventilation
Ventilation systems are required for engine compartments. Your boat
features a set of deck vent shrouds with mesh covers which supply
fresh air constantly to the engine compartment. A powered blower
motor connected to ducts in the lower one third of the bilge evacuates
air to the atmosphere. Read and understand the following warning.
Be sure to read and understand the engine and propulsion unit
manual before operating your vessel. Failure to do so could
result in equipment damage and/or death and serious injury.
All owners are responsible for keeping their boat's ventilation systems
in operating condition. This means making sure the ventilation covers
are obstruction free, ducts are not blocked or tore, blower operates
properly and any worn parts are replaced with approved marine parts.
Catalyst Engines
Most 4-stroke marinized engines are equipped with a catalytic converter
to meet U.S. EPA emissions requirements.
A catalytic converter utilizes extreme heat to reduce the engine's output
of hydrocarbons and carbon monoxide thus reducing pollutants. The
system theory involved follows the automotive market but the actual
parts and closed loop designs are unique to the marine industry due
to temperature, space restrictions, weight and corrosion factors found
in the marine environment.
Both major engine manufacturers incorporate catalytic converters
within a water-jacketed manifold. Oxygen sensors are placed in the
system along with on board monitoring equipment. The systems permit
the engines to operate at normal horsepower ratings.
3-18
!
WARNING
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