Technical data

Checking The Back Pressure
1. Exhaust pipe flange
2. Exhaust line
3. Transparent plastic hose, partly filled with water.
Measurement "A" may not exceed 39" for normally
asperated engines and 19.5" for turbo-charged engines.
WATER CONNECTIONS
Seacocks and strainers should be of the full flow
type at least one size greater than the inlet thread of the sea
water pump. The strainer should be of the type which may
be withdrawn for cleaning while the vessel is at sea.
Water lines can be copper tubing or wire-wound, reinforced rubber hose. In arty case, use a
section of flexible hose that will not collapse under suction, between the hull inlet and engine and
between the outlet and the exhaust system. This takes up vibration and permits the engine to be moved
slightly when it is being re-aligned. Do not use street elbows in suction piping. All pipe and fittings
should be of bronze. Use sealing compound at all connections to prevent air-leaks. The neoprene
impeller in the sea (raw) water pump should never be run dry.
FUEL TANK AND FILTERS
Fuel tanks may be of fiberglass, monel, aluminum, plain steel or terne plate. If made of
fiberglass, be certain that the interior is gel coated to prevent fibers from contaminating the fuel system.
Copper or galvanized fuel tanks should not be used. It is not necessary to mount the tank above the
engine level as the fuel lift pump provided will raise the fuel from the tank. The amount of lift should be
kept minimum (6 feet being maximum). If a tank is already installed above the engine level, it can be
utilized in this position. Great care should be taken to ensure that the fuel system is correctly installed so
that air-locks are eliminated and precautions taken against dirt and water entering the fuel.
A primary fuel filter of the water collecting type should be installed between the fuel tank and
the fuel lift pump. A recommended type is available from the list of accessories. The secondary fuel filter
is fitted on the engine between the fuel lift pump and the injection pump and has a replaceable element.
As the fuel lift pump has a capacity in excess of that required by the injection pump, the overflow is
piped to the fuel tank and should be connected to the top of the tank or as near the top as possible.
To insure satisfactory operation, a diesel engine must have a dependable supply of clean diesel
fuel. For this reason, cleanliness and care are especially important at the time when the fuel tank is,
installed, because dirt left anywhere in the fuel lines or tank will certainly cause fouling of the injector
nozzles when the engine is started for the first time.