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 TM 55-1905-242-14
OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
THEORY OF OPERATION
FUEL SYSTEM
FUEL TANKS
The LCM-8 Mod 2 is equipped with two fuel tanks located in the lazarette, port (1) and starboard (2), aft of bulkhead 39.
Each tank has a capacity of 432 gallons (1635.3 liters). The fuel tanks store all of the fuel necessary to operate the propul-
sion engines and the diesel generator.
FUEL LINES AND PIPING
Both rigid and flexible fuel lines are used in the LCM-8 Mod 2 fuel system. Rigid lines are used where piping runs are long
and where equipment vibration and movement are not a concern. Flexible lines are used in areas where equipment vibration
and movement might damage rigid lines.
Four types of lines are used in the LCM-8 Mod 2 fuel system. Fuel fill pipes direct fuel to the proper tank(s) during fueling
operations. Fuel vent pipes vent the fuel tanks to allow for varying fuel levels within the fuel tanks. Fuel supply lines carry
fuel to the engines. Fuel return lines return unburned fuel back to the tanks.
FUEL VALVES
Several types of valves are contained in the LCM-8 Mod 2 fuel system. Fuel suction valves (3) secure the flow of fuel from
the fuel tanks. Fuel supply valves (4) are used to secure the flow of fuel to their respective engines. Return fuel is secured
by the fuel return valves (5). Fuel fill valves (6) direct the flow of fuel into the appropriate tank(s) during fueling operations.
By properly positioning the fuel valves, the operator can determine which tank(s) supply fuel to the engines, which tank(s)
receive return fuel from the engines, and which tank(s) are filled. Fuel drain valves (7) allow draining of the fuel tanks when
necessary.
RETURN
SUPPLY
5
4
5
BKHD39
2
1
3
FWD
7
7
6
6
LAZARETTE
FUEL FILLS, VENTS, AND SOUNDINGS
The fuel tanks are filled through a fuel fill fitting located on the aft deck, starboard, at frame 40. The fuel tanks are both
vented through a shared vent located adjacent to the fuel fill. Fuel tank sounding accesses are located outboard at frame 40
port and starboard. Fuel tank sounding accesses may be used for unpressurized fuel tank filling.
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