Ventilation - Regal 42SC Owner's Manual

VENTILATION SYSTEM- DIESEL

Ventilation

Ducting
engine the more air is required to meet the demand.
Since diesels compress the air at a much higher ratio than
similiar gasoline models that require a spark in the process
the chance of explosion or fi re is much lower with diesel
power. Therefore, it is not necessary to force the exhaust
from the sump with a powered ventilation system like the
gas engine.
Diesel engines exhaust large amounts of incoming air by
mixing it through the combustion process and forcing the
air through the engine exhaust system into the water. The
same deck cowlings are used to funnel incoming air for
combustion. The remaining air exits through the cowlings
into the atmosphere.
This "breathing cycle" occurs naturally within the diesel
with more oxygen being required as the throttle speeds
are increased.
As part of diesel maintenance, ensure the cowlings are free
of debris including animal nests such as wasps and birds.
Check and replace the diesel engine air fi lters as required.
Note that the diesel air fi lter can not be cleaned so scrap it
and replace according to maintenance schedules. See your
nearest Regal yacht dealer for fi lter parts.
Also, it is recommended that after a cruise you let the
engines and generator idle under a 'no load' condition for
several minutes. Perform a visual check for exhaust and
fl uid leaks in the bilge. Since there is a light gelcoat color in
the bilge bottom it will be easier to spot any fl uid leaks.
With diesel engines
large amounts of
air are required
to perfor m the
c o m b u s t i o n
process. The higher
the revolutions
per minute of the
3
Engine & Controls
WARNING
!
BEFORE STARTING ENGINES
CHECK ENGINE COMPARTMENT
FOR FUEL LEAKS.
WARNING
!
TO PREVENT FIRE OR EXPLOSION
DO NOT STORE
FLAMMABLE LIQUIDS IN CONTAINERS
ANYWHERE ON THE VESSEL!