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PowerTech Marine Power System Manual

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COOLING WATER SYSTEM:
The Marine Power Systems engine is cooled by a fresh water/anti-freeze system employing a
heat exchanger to dissipate engine heat. The engine fresh water-cooling system is a closed loop system
similar to non-marine units, with the exception being a heat exchanger instead of a radiator. Seawater is
used as the heat exchanger’s cooling medium. This system operates by pumping cool seawater into the
heat exchanger, which absorbs heat from the fresh water system; it then exits through the engines
exhaust manifold, also removing exhaust heat and gases as well. The seawater cooling system
incorporates components specifically designed for marine applications. Attention to component
selection and mounting location is an important consideration.
CAUTION: DO NOT use a scoop-type through-hull fitting for the seawater supply. This type of fitting
will cause excessive pressure on the seawater pump, actually forcing seawater pass the impeller into the
engine exhaust manifold and cylinders. Engine damage resulting from this is not a warrantable issue.
The seawater is supplied through a flush-type hull seacock fitting located in an area of the hull
which must remain submerged at all times during operation. From the seacock fitting a positive shut
OFF valve should be placed ahead of the seawater strainer. A visual-type seawater strainer should be
used and mounted at or below the water line to be assured the supply line remains primed. The use of
high quality wire reinforced hose is recommended to prevent the hose from collapsing during operation.
Non-reinforced hose may collapse from the seawater pumps’ suction. All hoses and fittings must be of
adequate size to prevent any restrictions in the flow of seawater throughout the system. Machined
fittings with true inside diameters are preferred over standard pipefittings.
FUEL SYSTEM:
The diesel fuel system for a Marine Power System must be designed to operate independently
from the vessels main engine. In most installations both engines operate from a common fuel tank with
separate pick-up and return lines for each engine.
NOTE: Never use a simple Tee fitting to supply both engines from a common fuel line. This practice
may cause a fuel starvation situation to either or both engines. Additionally, excessive pressure may
build up in the main supply line and possibly cause a fuel line or connector failure resulting in a
hazardous fuel leak.
The unit comes equipped with a spin-on type fuel filter installed between the fuel pump and the
injector pump. It is recommended however; that a positive shut OFF valve and marine approved primary
filter/water separator be installed between the fuel tank and fuel pump. Mount these components in an
area that is readily accessible for service. Use only high quality ¼” ID fuel line and fittings suitable for
marine applications throughout the system. Carefully plan and route the fuel supply and return lines,
secure them with the proper clamping devices to prevent vibration and chaffing. Routine inspections and
service of all fuel system components will assure safe trouble free operation.
IMPORTANT: A fire extinguisher with the NFPA rating of ABC should be in close proximity to the
unit and easily accessible. Maintain it in good working order and be familiar with its use.
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