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Cold Weather Precautions
With the approach of cold weather, in regions where the temperature drops below the freezing point,
precautions must be taken to prevent freezing of the water in the cooling system. When water freezes it
expands and may burst the radiator and cylinder block.
Be careful to drain the system completely (see "Cooling System" Page 30) when putting up the vehicle in
cold weather, unless it is kept in a heated garage or an anti-freeze solution has been added to the water to
sufficiently lower the freezing point of the cooling mixture.
ANTI-FREEZE SOLUTION.
It is important that the cooling system be made leak-proof before installing any antifreeze solution. Should
there be any doubt regarding the condition of either radiator or heater hoses, replace them.
Common antifreeze solutions available are alcohol and ethylene glycol. The distillation or evaporating
point of alcohol solution is approximately 170
when used as a farm tractor and especially when used for belt work through the power take-off is
somewhat higher. As a result, alcohol will not be satisfactory to use as an anti-freeze due to evaporation.
Should it be necessary to use it, the solution must be checked often with a hydrometer to guard against
damage due to freezing. Alcohol is satisfactory for highway use, however, it must be checked frequently
to make certain that freezing will not occur at anticipated temperatures.
Ethylene glycol has a much higher evaporating point than alcohol, so may be used at higher operating
temperatures without loss of the solution. In a tight cooling system, water only is required to replace
evaporation losses, however, any solution lost mechanically through leakage or foaming must be replaced
with additional solution.
The capacity of the cooling system is 11 qts. (10.4 lts.). The following table shows the correct quantity of
both alcohol and ethylene glycol for protection at the various temperatures indicated:
Temp.
Temp.
Fahr.
Cent.
30°
-1.1°
20°
-6.7°
10°
-12.2°
0°
-17.8°
-10°
-23.3°
-20°
-28.8°
-30°
-34.4°
-40°
-40.0°
The engine should be operated to thoroughly mix the solution.
ENGINE OIL
In cold weather it is important that a lighter grade engine oil be used so that the engine may be started
easily and to assure an adequate flow of oil to every part of the engine. Use oil having a low cold test
which will not congeal at the temperature to which it will be subjected.
GEAR LUBRICATION.
Hard shifting of the transmission gears in cold weather is a positive indication that the transmission
lubricant is either too heavy grade or the
ALCOHOL
U.S.
Imperial
Metric
Qts.
Qts.
Liters
1
4/5
0.946
2-1/8
1-4/5
2.011
3-1/4
2-4/5
3.075
4-1/4
3-3/4
4.022
5
4-1/8
4.732
5-1/2
4-1/2
5.205
6-3/4
5-2/3
6.388
7-1/4
6
6.861
°
°
F. (76.67
C.). The operating temperatures of the Jeep
ETHYLENE GLYCOL
U.S.
Imperial
Qts.
Qts.
1
4/5
2
1-2/3
3
2-1/2
3-3/4
3-1/8
4-1/2
3-3/4
4-3/4
4
5-1/2
4-1/2
6
5
53
Metric
Liters
0.946
1.892
2.839
3.549
4.258
4.495
5.205
5.678
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