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 TM 5-1940-277-20
TM 1940-20/2
The MK2 engines will not be operated out of water for more than 20 minutes at Idle
speed. Serious engine damage could result.
For out of water operation during unit or higher maintenance actions, refer to
3-3.
FUEL SYSTEM. The fuel system consists of a tank, valves, fuel water separators, fuel pumps, fuel filters, injection
pump, injectors and the piping and hoses to connect the components. A detailed description of the fuel system
is contained in TM 5-1940-277-10.
Maintenance procedures for the fuel system must be performed In a well-venti-
lated area. Do not allow sparks, flame, or smoking in the vicinity. Serious Injury
to personnel may result.
3-4.
ELECTRICAL SYSTEM. The electrical system is a 24-volt direct current wired return type. There are a total of four
12-volt batteries in the system. Two batteries are connected in series to provide 24 volts. The port set of batteries
provides power for starting engines and port engine instruments. The starboard set of batteries provides power
for the auxiliaries and the starboard engine instruments. Each set of batteries is normally charged by alternator
output for its respective engine. Should one alternator fail an automatic system allows charging of both sets of bat-
teries by one alternator. To assist in engine starting under difficult conditions, a solenoid switch operated from the
switch panel can be used to line both sets of batteries in parallel. An inter-vehicle starting socket is connected to
port batteries to enable an additional external power source to be used, or to enable assistance to be given to other
boats. A system wiring diagram is shown in the foldout in the back of the manual.
Before performing any repair on the electrical system, place master switch OFF
and disconnect battery negative cables.
3-5.
ENGINE LUBRICATION. Due to lack of space the oil must be pumped from the engine sump. There will always
be some oil left in the sump. When filling at an oil change it is advisable to start checking oil level after putting in
about 15 quarts.
3-6.
OTHER MAJOR ITEMS. The fire extinguishers are suitable for electrical and flammable liquid fires. There is one
extinguisher fixed in place on each engine hatch cover and one hand-portable extinguisher mounted in the opera-
tor's cockpit area. There are two electric bilge pumps. One is located in the aft of the engine compartment and the
second in the stem of the boat.
3-2
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