Operator`s manual
Exhaust System
The exhaust system provides an outlet line to vent engine exhaust gases out
01
and away from the vessel.
The system also discharges sea water which has passed through the engine's sea water circuit
by
mixing
it
with hot exhaust gases. This mixing helps cool the exhaust gases and exhaust elbow and plumbing. The
exhaust system and the sea water supply to the exhaust
must be configured to prevent the siphoning
of
sea
water into the exhaust through the sea water
cooling circuit and
to
prevent the entry
of
sea water into the
exhaust through the circuit's through-hull discharge port.
If not prevented, sea water entering through the
discharge port can
fill the exhaust system muffler and enter the engine's cylinders. This will prevent proper
starting and possibly cause damage
to
internal engine components.
The sea water supply hose
to
the exhaust system water injection elbow should be routed (looped) at least
12
inches above the vessel water line.
An
anti-siphon break should be installed, when needed, at the
lop
of
this loop. The
top
of
the
loop
should be placed high enough above the vessel's water line so
as
to
remain
above the water
line when the vessel
is
underway, no matter what the angle of heel
or
roll may be.
[HGINE~aboye
Wgttr
line
l~
LD.
INSULAT
E
fOLD/WRTER-INJECTED
ELBOW
NINIMU~
OF
6-
INCHES
ABOVE
VESSEL'S
WATER
LINE.
ENGINE-below
water
line
SrPItOH
....
EAK
I'ART
If
33327'
ENGINE
INSTALLATIONS
WITH
EXHAUST
MANI-
FOLD/WATER
INJECTED
ELBOW
AT
OR
BELOW
VESSEL'S
WATER
LINE.
1*
LD.
4B~
MAX.
HYDRO-HUSH
~J
CAIJIION:
Vented
loop
Must
be
in
a
location
where
it
will
rem~in
~bove
the
water
line
during
all
angles
of
vessel
operation_
The sea water supply through-hull sea
cock
fittings must be of the flush-hull type. High-speed scoop type
of fittings should
nol
be used as they tend
to
encourage siphoning.
The exhaust discharge from the water
lift muffler should be routed well above the water line then downward
to
the through-hull discharge. This routing will prevent sea water entry
if
the through-hull discharge fitting
becomeS submerged when the vessel heels
or
rolls while under way, or
is
subjected to following sea con-
ditions. Refer
to
the ligures shown above for recommended exhaust system installations.
Weslerbeke Diesel Engines
26