Table 3-2. Freezing Points, Composition, and Specific Gravities of Military Antifreeze Materials

TM 10-3930-633-12

Table 3-2. Freezing Points, Composition, and Specific Gravities of Military Antifreeze Materials

Lowest

Pints

Ethylene glycol

Compound antifreeze

expected

inhibited

coolant solution

Artic

ambient

glycol per

specific gravity

temp.

gal. of

at 68 F3

coolant 1

-20

Issued

full

strength

and

ready

mixed

for

temperatures

for

both

1.022

+10

initial

installation

and

replenishment

losses.

1.036

1.047

-10

1.055

-20

1.062

-30

1.067

DO NOT DILUTE WITH WATER OR ANY OTHER SUBSTANCE.

Arctic antifreeze preferred

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

Military Specification MIL-C-11755 Arctic type, nonvolatile anti-freeze 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 close to 40 F, or drops below, to as low as -90 F.

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

hydrometer reading of 0 F.

3-9. Hand Brake--Minor Adjustment

b. Hydrometer readings should be used to

determine the battery state of charge. This is

a. When slack develops in brake linkage due to

particularly true in cold weather, as a partially

lining wear, it may be restored by placing lever in

discharged battery may freeze at temperatures up

the full release position, and turning the knurled

to 20 F.

knob on top of the lever several turns clockwise.

c. Take readings on the hydrometer as shown

b. After making the adjustment, recheck brake

in figure 3-2. Battery will need charging if the

action. There should be noticeable tension as the

specific gravity reads 1.225 (or less) at 750 F.

lever passes t h e over-center position. If

Correct the hydrometer reading according to the

necessary, repeat adjustment

ambient temperature as shown by figure 3-2.

NOTE

CAUTION

If brake effectiveness cannot be restored by the

Specific gravity should be 1.265 or

above adjustment, a major adjustment or relining

of the brake is, required, See Chapter 4.

greater if battery is exposed to freezing

temperatures. If machine is operated in

3-10. Battery State of Charge Check

tropical climates where no freezing

a. Check battery electrolyte level frequently,

weather is encountered, the full charge

especially in hot weather. Maintain the level at `/2

specific gravity may be lowered from

inch over the top of the plates by adding distilled

1.375 to 1.225 by diluting the electrolyte

water, when necessary.

with distilled water.

NOTE

Never allow sparks or open flame in the

Do not add distilled water to electrolyte im-

area when checking the battery. Storage

mediately after charging the battery.

b a t t e r i e s produce hydrogen, an ex-

plosive gas, as a normal by-product of

operation.

3-4