Exhaust system
2
Exhaust outlet - through-hull
fittings
WL
The through-hull fittings are placed at a suitable
point above the waterline with a loaded boat. If the
through-hull fitting opens below the water-line a shut-
off valve must be installed at the outlet, or a rigid pipe
connected. This must reach at least
350 mm (14")
above the water-line with a loaded boat.
This type of outlet is a kind of standard component
and should not be located at flat transoms. See sec-
tion
"Wagon-back effect" in chapter Exhaust sys-
tem, General.
Exhaust riser
Figures A and C show a Volvo Penta multi-purpose
riser fitted on a D2 engine. This riser can be used
on both port and starbord engine in a twin engine
installation. The riser is continuosly adjustable in the
vertical and the horizontal plane for each installation
purpose.
A riser is also available for D9/D engines. It is of
dry type and is shown in figure B () together with the
wet exhaust elbow.
NOTE! The dry part of the riser, see figure B and C
(), should be insulated with proper heat insulation
material, see figure C (2).
2
WL
α
Wet exhaust elbow D9/D11
The elbow angle is fixed. It is possible to make small
adjustments to the exhaust outlet position by rotating
the fixed elbow.
Note! It is very important that the exhaust outlet is
not pointing upwards. In that case there is a big risk
that water will return into the exhaust elbow and
reach the turbo.
Minimum exhaust elbow angle (
α
) relative to water
line (WL) is dependent on engine type. See figure
and table in chapter
Wet exhaust line, Dimension-
ing the exhaust line.
Elbow
Riser ()
Figure B
Figure C
Figure A
Содержание D11 series
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