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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
PROPULSION SYSTEM
PROPULSION ENGINES
Two Detroit Diesel 12V71 engines power the LCM-8 Mod 2 propulsion system. Each engine has 12 cylinders arranged in
a "V" configuration. Engine rotation is right hand (flywheel rotates counterclockwise when viewed from the rear) for both
engines. The propulsion engines power the following components:
1.
Marine transmissions that propel the vessel.
2.
24 Vdc alternators that provide ship's power when the propulsion engines are operating (see WP 0005 00).
3.
Hydraulic pumps for the steering, starting, bilge, ramp, and crane systems (see WP 0006 00).
Engine speed is controlled by a dual function control head, located in the pilothouse console. The control head lever
actuates the engine's governor lever by means of a double acting cable assembly. The engine's governor, in turn, controls
engine speed throughout a preset range. The governor also acts to prevent the engine from exceeding a preset speed.
Refer to TM 5-2815-231-14 for further information on the propulsion engines.
MARINE
TRANSMISSION
PROPULSION ENGINE
POWER
TAKEOFF
PORT SIDE VIEW
STARBOARD SIDE VIEW
PROPULSION ENGINES (TYPICAL)
MARINE DRIVE GEARS
Two Twin Disc MG-514C marine transmissions transmit the engine's rotating power to the propellers. The transmissions
allow shifting between forward, neutral, and reverse. The transmissions have a 2:1 reduction ratio. A power takeoff is
mounted on top of each transmission to drive the bilge/ramp/crane hydraulic pump.
The marine transmissions also facilitate counterrotation of the propellers. Although both propulsion engines are right hand
rotation, good marine engineering practice dictates that the starboard propeller should be left hand rotation while the port
propeller is right hand rotation. The internal gearing of the marine transmissions permits this counterrotation.
Refer to TM 5-2815-231-14 for further information on the marine transmissions.
0003 00-1
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