Exhausts & Mounting Exhausts - Beta Marine BV1305 Operation And Maintenance Manual

EXHAUSTS
(a) A correctly installed engine as
described in this handbook will meet
the exhaust emission requirements of
Directive 2003/44/EC amending the
Recreational Craft Directive
94/25/EC.
(b) For compliance with exhaust
emissions requirements, engines
must have correctly installed exhaust
systems. To ensure exhaust
emissions are kept within permissible
limits it is most important to reduce
exhaust back pressure to a
minimum, whilst ensuring exhaust is
adequately muffled. Back pressure
increases as exhaust length increases
and from bends in the exhaust
system. The exhaust back pressure,
TYPICAL YACHT INSTALLATION
Maximum sea water level when healed
Allow at least
10% of propeller
diameter for tip
clearance to hull
WARNING:
(1) One of the most common
problems with engine installation is
water entering the exhaust manifold
from the exhaust system by
syphoning. This can occur when the
point of water injection (X) on the
engine is close to or below the water
line. Water entering the pistons can
cause bent con rods, emulsified
Standard
Option 1 5/8" is available in SS
High rise water injection bend SS
Option high rise water injection bend SS
Cross over injection bend SS
to suit Volvo replacement engines.
measured with the exhaust system
connected and the engine running at
full speed, must not exceed 80mmHg
(3.1 inches Hg / 42 inches WG).
The correct measuring point is at the
position where the exhaust connects
to the exhaust manifold. That is
(on the centre line of the boat)
Normal sea
water level
Sea water Level
Waterlock
Silencer
If a rope cutter is fitted, allow
approximately
manufacturer's literature
engine oil and a wrecked fuel pump!
Its best avoided!
(2) The diagram shows a typical
installation. It is essential that the
small black rubber hose connecting
the heat exchanger with the injection
bend is removed and replaced by a
hose marked 'a'. This must be of
sufficient length to
Anti syphon valve
or T piece fitted here
a
300mm
minimum
X
1 / " for movement of engine, see
2
BD1005 BV1305
50mm 50mm
1 5 / " N/A
8
50mm 50mm
1 5 / " N/A
8
50mm 50mm
before the water injection elbow or
dry exhaust bellows.
Wet Exhaust hose should be
matched to the injection bend sizes,
see above.
supply either a T piece or an anti
syphon valve sited at least 300mm
(12 inches) above the water line and
on the centre line of the boat. The
pipe then returns to the injection
bend and the sea water is pumped
down the exhaust pipe.
(3) The exhaust back pressure should
not exceed 3.1 inches of Hg.
BV1505
50mm
N/A
50mm
N/A
50mm