7
Section 1
Keel cooled engine, overheating is sometimes caused by:
a) Not fully venting the engine cooling system of air. It is
necessary to remove all air from the cooling system -
including the “skin” tanks and (if fitted) the Calorifier
and associated piping.
b) Incorrectly sized “skin” tanks that have been sized for
‘usual’ canal use, rather than maximum engine output
that can sometimes be required on fast flowing rivers.
An additional “skin” tank may need to be fitted; please
refer to our website: Inland waterways - guidelines:
keel cooling tank sizes.
INSTALLATION RECOMMENDATIONS FOR
KEEL COOLED ENGINES
The installation details are basic guidelines to assist
installation, however due to the great diversity of marine
craft it is impossible to give definitive instructions.
Therefore Beta Marine can accept no responsibility for any
damage or injury incurred during the installation of a Beta
Marine Engine whilst following these guidelines.
• All engines shall be placed within an enclosure
separated from living quarters and installed so as to
minimise the risk of fires or spread of fires as well as
hazards from toxic fumes, heat, noise or vibrations in
the living quarters.
• Unless the engine is protected by a cover or its own
enclosure, exposed moving or hot parts of the engine
that could cause personal injury shall be effectively
shielded.
• Engine parts and accessories that require frequent
inspection and / or servicing must be readily
accessible.
• The insulating materials inside engine spaces shall be
non-combustible.
INSTALLATION RECOMMENDATIONS
The engine compartment needs air.
a) as air (oxygen) to burn the diesel fuel, and
b) as air to keep the engine cool (still hot at 100°C)
by ventilation.
It is important that the engine compartment has adequate
ventilation, and this is your responsibility. If there is no
ventilation the engine can overheat and damage can be
caused. As a general statement an engine will produce
radiated heat - approximately equal to
1
/
3
of the engine
output power. Also the larger battery charging alternators
create lots of heat. (A symptom of overheating problems is
often black belt dust). If you have any doubts about the
temperature of your engine compartment please check
with a thermometer on a hot day, the maximum
temperature in the engine compartment should be less
than 70°C - the cooler the better!
Engine compartment ventilation is normally best with two
holes; an inlet allowing colder air to enter below to the
alternator and drive belts and a second outlet (about the
same size) for the hot air to rise and ventilate out from the
top of the engine compartment. Adequate ventilation must
be included with all installations. Many installations now
include a good quality reliable electric ventilation fan to
remove the hot air. The required air flow volumes in
m
3
/min = 0.05 x engine power in hp.
VENTILATION
10hp 20hp 30hp 40hp 50hp 75hp 100hp 150hp
Combustion 14 cm
2
28 cm
2
43 cm
2
57 cm
2
71 cm
2
106 cm
2
142 cm
2
213 cm
2
Ventilation 13 cm
2
25 cm
2
37 cm
2
50 cm
2
62 cm
2
92 cm
2
123 cm
2
185 cm
2
Inlet / Outlet dia. 6 cm 9 cm 11 cm 12 cm 13 cm 16 cm 19 cm 22 cm
Typical ventilation sizes
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