Keel Cooling - Dry Exhaust - Beta Marine Beta 50 Operator's Maintenance Manual

KEEL COOLING - DRY EXHAUSTS
a) An engine correctly installed in accordance with this
handbook will meet the emission requirements of the
RCD (Recreational Craft Directive).
b) Keep exhaust systems to a minimum length and have
gradual bends.
c) The dry exhaust system installed in a vessel should be
1 / " minimum internal diameter. The engine is fitted
1
2
with a 1 / " BSP male connector stub as standard -
1
2
Valid for exhaust systems up to 3 metres in length.
A flexible exhaust bellows and dry exhaust silencer
should always be used. It is up to the installer to work
out the most appropriate pipe run but care should be
taken as follows:
• Never use a flexible exhaust bellow as a bend, it will
crack, always keep them straight.
13 Dry Exhaust System
14 Dry Exhaust System
• Hydraulic lock, occurs when water is allowed to
enter the combustion chamber via the exhaust
and 'hydraulics' against the rising piston with the
consequences possible being, a bent con rod/s, an
emulsified engine oil and/or a damaged fuel pump.
It is imperative that it is avoided, always ensure that
canal, river or sea water cannot enter the exhaust port
and run back down the pipe, flooding the silencer and
then the engine. Please refer to image 13 & 14.
• The system should be lagged if there is any danger of
the crew getting near it.
• A dry exhaust system will give off considerable heat
and suitable insulation and ventilation must be
provided, please refer to page 7.
Flexible
Exhaust Hose
Ensure exhaust raises then falls to outlet
Flexible
Exhaust Hose
13