TM-3-1040-279-12-P
GENERATOR SET, SMOKE, MECHANICAL: PULSE JET, M157 W/120 GAL FOG OIL TANK AND W/80 GAL FOG OIL TANK
TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST AND DEPOT MAINTENANCE REPAIR PARTS
MAY 1987
TM-3-1040-279-12-P - Page 43 of 389
TM 3-1040-279-12&P
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-10 OPERATION IN EXTREME COLD.
a. Effects of Freezing Weather.
At temperatures below 32°F (OºC), condensation may freeze in fuel, fog
oil, and air lines. This freezing may occur on strainers or in elbows of lines, reducing or stopping flow or fuel,
fog oil, or pressurized air. When this occurs, lines must be cleared. Use type 2 automotive combat gasoline
in fuel system or add 16 ounces of isopropyl (item 7E, app E) to every 5 gallons of untreated gasoline. Use
cold weather fog oil mixtures cited in para 2-10b to prevent frozen water crystals from forming in fog oil.
b. Cold Weather Fog Oil Mixtures.
For operation in freezing weather, fog oil (item 6, app E) and
kerosene (item 8, app E) or equivalent (diesel fuel) can be blended to form mixtures that flow easier. The
following table lists percentages of fog oil-fuel mixtures recommended for operation in freezing weather.
Add 16 ounces of diethylene glycol monomethyl ether (DGME) (item 7D, App E) to every 40 gallons of fog
oil-fuel mixture to prevent ice from forming. Notify fuel supply personnel if your generator requires these
mixtures. Fuel supply personnel are responsible for mixing and supplying these mixtures.
FOG OIL-FUEL MIXTURES
OPERATING TEMPERATURES
PERCENTAGE BY VOLUME
Fahrenheit (F)
Celsius (C)
Above 32°F
Above 0°C
32 to -10°F
0 to - 23°C
-10 to - 25°F
-23 to - 32°C
-25 to - 40°F
-32 to - 40°C
Fog Oil
100
75
60
50
Diesel Fuel or Equivalent
0
25
40
50
c. Starting in Freezing Weather.
These instructions are in addition to paragraph 2-9a.
(1)
In temperatures below 32°F (0°C) use type 2 automotive combat gasoline. Keep excess fuel
supply in tightly capped containers to prevent contamination.
(2)
Keep fuel tanks as full as possible to prevent condensation from forming in fuel tanks.
WARNING
Primer fuel spray is very flammable. Do not allow open flames, sparks or
heated objects in the area during procedure.
NOTE
Two people are needed to perform next step.
(3)
If type 2 automotive combat gasoline is not available, use engine primer fuel. Spray fuel into
nozzle assembly and step back before placing ENGINE switch in START position.
(4)
If starting smoke generator in temperatures below 20°F (-7°C) follow steps (1) through (5) of
STARTING PROCEDURES (P. 2-10.6) then proceed as follows:
(a)
Rotate FOG OIL FLOW control knob fully clockwise.
Change 4
2-13
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