PART D -- OPERATE THE M157 SMOKE GENERATOR
SYSTEM UNDER UNUSUAL CONDITIONS
Different climates prevent the smoke generator operator from always operating the M157 Smoke
Generator System under optimum conditions. Extreme cold or extreme heat requires modifications to
the starting and stopping procedures as well as to the types of fuel and fog oil used.
Extremely Cold Operations. Procedures for operating the M157 Smoke Generator Set under
extremely cold conditions follow.
a. Fog Oil Mixture. At temperatures below 32 F (0 C) the fog oil must be blended with
kerosene to produce a mixture that flows easily at cold temperatures. Fuel supply personnel are
responsible for making the mixture. See Table 3-1 for fog oil-kerosene mixtures.
Table 3-1. Fog oil-kerosene mixtures
b. Fuel. At temperatures below 20 F (-12 C) use Type 2 automotive combat gasoline. Keep
fuel cans as full as possible to prevent condensation from forming. Keep excess fuel in tightly sealed
If Type 2 automotive combat gasoline is not available, starting fluid (ether) may be substituted and
sprayed into the nozzle assembly during starting procedures when the engine switch is held in the
START position. Two people are required to perform this task.
c. Starting Procedures. Follow these procedures for starting the M157 Smoke Generator Set at
temperatures below 20 F (-7 C) (Figure 3-5).
Turn on the vehicle engine.
Set circuit breaker CB1 (1) to the ON position.