Section II. OPERATION UNDER UNUSUAL CONDITIONS

TM 10-3930-242-12

STOP CONTROL down. The

NOTE

EMERGENCY STOP CONTROL reset

To restart the engine after the

lever, located on left side of engine must

EMERGENCY STOP CONTROL has

be pushed toward the cylinder block.

been used, push the EMERGENCY

Section II. OPERATION UNDER UNUSUAL CONDITIONS

foreign materials. If fuel filters requir servicing,

2-6. Operation in Extreme Cold (below 0F.

report to organizational maintenance.

(18 C))

f . Lubricate in accordance with current

a. Check coolant level and add coolant as

lubrication chart (fig. 3-1).

specified in table 2-1. Have organizational main-

g. Pull up on either primer button, engage starter,

tenance perform specific gravity test to make sure

and with the engine turning, press the ether button

that antifreeze solution is correct for lowest tem-

down. If combustion does not occur, repeat the

perature expected.

priming process with the starter engaged.

b. Inspect cooling system. Correct or report any

h. In extremely cold weather it is advisable to

leaks.

give the engine one priming charge before engaging

c. Keep batteries fully charged. After adding

the starter. Then proceed as in g above.

distilled water to the batteries, run the engine for at

i. Allow the engine to reach normal operating

least 15 minutes.

temperature before applying load.

d. Keep fuel tank full when not in operation.

e. Drain secondary fuel filters of water and

Table 2-1. Freezing Points, Composition, and Specific Gravities of Military Antifreeze Material

Lowest

Pints of

expected

inhibited

Ethylene glycol

Compound, antifreeze2

ambient

glycol per

coolant solution

gallon of

temp

specific gravity

coolant1

at 68 F.

11/2

+20

Issued full strength and ready mixed for 0 to 65 F temperatures

1.022

for both installation and losses.

+10

1.036

1.047

1.055

1.062

1.067

1.073

Arctic

antifreeze

preferred

Maximum protection is obtained at 60 percent by volume (4.8 pints of ethylene glycol per gallon of solution).

Military Specification M IL-C-11755 Arctic type, non-volatile antifreeze compound is intended for use in the cooling system of

liquid cooled internal combustion engines. It is used for protection against freezing primarily in Arctic regions where the ambient

temperature remains for extended periods of time close to 40 F., or below, to as low as 90 F.

` Use an accurate hydrometer. To test hydrometer, use 1 part ethylene glycol type antifreeze to 2 parts water. This should produce a

hydrometer reading of 0 F.

2-7. Starting Aid

(2) perform normal starting procedures (para

2-3).

a. General The starting aid is a pressurized

(3) If engine fails to start, refer to

system used to inject a highly volatile fluid into teh

troubleshooting table (table 3-2).

engine air intake system. This is to facilitate

starting when ambient temperatures are below

2-8. Operation in Extreme Heat

40 F. The replaceable pressurized cylinder contains

WARNING

sufficient fluid for 75-150 starts.

Be extremely careful when removing the

b. Operating the Starting Aid.

radiator filler cap of a hot engine. Release

(1) Operate starting aid control for about 2

of pressure may cause violet boiling and

seconds. Wait 3 seconds before cranking engine.

serious injury to personnel.

2-12