Section IV. OPERATION UNDER UNUSUAL CONDITIONS

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 32F (OC), 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

PERCENTAGE BY VOLUME

OPERATING TEMPERATURES

Diesel Fuel or Equivalent

Fahrenheit (F)

Celsius (C)

Fog Oil

Above 32F

Above 0C

100

32 to -10F

0 to - 23C

-10 to - 25F

-23 to - 32C

-25 to - 40F

-32 to - 40C

c. Starting in Freezing Weather. These instructions are in addition to paragraph 2-9a.

(1) In temperatures below 32F (0C) 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 20F (-7C) 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.

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