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Westerbeke WPDS-20 Betreibershandbuch Seite 11

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Exhaust System Failures
When the engine's sea water
is
fed into
an
exhaust system so that the full stream of this water strikes a sur-
face, erosion takes place. This erosion may cause premature failures. The proper design
of
either a water
jacketed
or
water injected 'wet" exhaust system
to
prevent this problem requires that the sea water inlet be
positioned so that the entering stream
of
sea water does not directly strike a surface. In addition, the velocity
of
the entering sea water stream should be as low as possible, which can be achieved
by
having inlet fittings
as big in diameter as possible.
The best protection against exhaust system leaks
is
to routinely inspect the complete exhaust system. Check
for leaks around manifolds, gaskets, and welds. Make sure exhaust lines are not heating surrounding areas
excessively. If excessive heat
is
present, correct the situation immediately. If you notice a change
in
the
sound
or
appearance of the exhaust system, inspect the exhaust system and correct the cause.
Exhaust risers installed off the exhaust mannold should not exceed 8
Ibs
in total weight
w~en
rigidly con-
nected. Excessive weight and vibration can result in a manifold failure and/or the fracturing
of
the riser from
the manifold at
tts
attachment. Dry portions of the exhaust connected
to
the manifold, which lay before the
water Injected exhaust system,
MUST
be properly insulated
to
retain the exhaust heat wtthin the exhaust
pipe.
iWARNINGI
Although diesel engine exhaust gases are not as toxic as exhaust fumes from gasoline en-
gines, carbon monoxide is present in diesel exhaust fumes in less concentration. Carbon
monoxide
is
a dangerous gas that can cause unconsciousness and is potentially lethal. Some
of
the symptoms
or
signs
of
carbon monoxide inhalation
or
pOisoning are as follows:
a Dizziness a Vomiting
a
Intense Headache a Muscular Twitching
a Weakness and Sleepiness a Throbbing in Temples
If you experience any of the above symptoms, get out into fresh air immediately.
Make sure there are
no
unnecessary objects suspended from any portion
of
the exhaust lines. Excessive
weight could cause deflection
or
distortion of the lines, resulting in damage
or
leaks. Inspect insulated por-
tions of the exhaust system
to
ensure there is no deterioration of the insulation.
Oil Drain
Hose
An
oil sump drain hose
is
located at the lower front
of
the engine. Oil may be drained from this hose by
removing the cap and the discharge end
of
the hose from the support bracket and lowering the hose into a
container. The hose cap fitting
is
1/4 inch NPT (National Pipe Tap) and can be extended, or have a pump
added, for easier removal of the old oil, if desired.
17
Westerbeke Diesel
Engines
Seitenansicht 10
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