TM 55-1930-203-10
antifreeze compound will be used full strength without dilution. Do not add water to cooling system if filled with
arctic type antifreeze.
(3) Inspect clamps, hoses, plugs, and fill caps after the cooling system is serviced to be sure each is tight. Inspect for leaks at
all joints.
(4) When operating at below freezing temperatures, have coolant checked weekly for proper strength.
NOTE
For warm weather changeover, the cooling system should be drained and flushed with fresh water and refilled
with antifreeze and rust inhibitor by organizational maintenance.
CAUTION
If liquid has been added, be sure battery is recharged.
c. Batteries. Request that organizational maintenance inspect liquid level and check the specific gravity of the batteries.
d. Lubrication. When ambient temperatures are expected to fall below freezing ( + 32 F. (0 C.)), request that organizational
columns, and transmissions and converters, in accordance with LO 55-1930-203-12-1.
e. Fuel. Diesel fuel must be kept in containers that are clean and free from rust. Water will accumulate in drums, tanks and
containers and will form ice at low temperatures. This ice will cause fuel lines and filters to clog. Keep all closures of tanks and
drums tight and all tanks full, if possible. This will reduce the amount of foreign matter and condensation in container.
f. Bilge and Cargo Well Pumps. During cold weather operation, insure that bilge and cargo well pumps are not frozen and jammed
with ice.
(1) After operation in water, operate bilge and cargo well pumps until all fluid is pumped from bilges.
(2) Open hull drain valves (fig. 2-10) and drain off remaining liquid. Close hull drain valves.
g. Engine Starting. The LARC engines are equipped with a
fluid starting aid (5, fig. 2-13) to
assist ignition of
fuel for cold weather
starting. The starting aid injects a highly volatile fluid (ether) into the air intake system through the atomizing nozzle in the air inlet
housing. The fluid is contained in a plastic capsule. The following procedure is to be used when starting engines at low
temperatures.
(1) Perform instructions outlined in paragraph 2-28 before attempting to start the engines.
(2) Place master switch (19, sheet 2, fig. 2-1) in "on" position.
(3) Unscrew the cap from the capsule container (8, fig. 2-13) and place capsule in the container.
(4) With the piercing shaft (7) of the capsule container in raised position (all the way out), screw the cap (by hand) tightly on
container.
(5) Push the piercing shaft down until it bottoms. This will break the capsule and fill the container with starting fluid vapor.
(6) Move the engine throttle to the full fuel position.
(7) Press the starter button (2) attached to the engine, simultaneously pulling the pump plunger (6) all the way back. Then
push the plunger in slowly, forcing the starting fluid through the nozzle into the air intake. Continue to push the plunger in slowly until
the engine starts.
NOTE
If plunger is not al the way in when engine starts, push it in very slowly until it locks.
CAUTION
Do not leave the empty capsule in the container. Reinstall the cap tightly on the
container. When not in use, the piercing shaft should be all the way down. Never
discharge a capsule into the intake of a hot engine.
(9) Unscrew the cap from the capsule container, remove the used capsule, and clean the pieces of plastic capsule from
container.
(10) Repeat starting procedures for the other engines using associated controls and instruments.
2-48. Hot Weather Operation
Operate the LARC as instructed for usual operation. In addition, perform the following:
a. Engine Protection.
(1) Keep coolant level 2 inches below filler neck in each water expansion tank.
(2) Check to make sure that radiator compartments and keel coolers are free of debris at each halt.
(3) Check engine oil pressure and water temperature gages regularly during operation. Do not operate with engines over 212F.
(100 C.).
(4) Do not idle engines for long periods.
b. Batteries. Request organizational maintenance to inspect the water level of the batteries
2-37