Section IV. OPERATION UNDER UNUSUAL CONDITIONS

TM 10-3930-638-10

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

Para

Operation at High Altitudes . . . . . . . . . . . . . . . . . . 2-15

Operation in Unusual Weather. . . . . . . . . . . . . . . 2-12

Operation in Snow . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Operation in Dusty or Sandy Areas . . . . . . . . . . . . 2-13

Fording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Operation in Salt Water Areas . . . . . . . . . . . . . . . . 2-14

engine, then increase speed and warm up the

12-12. OPERATION IN UNUSUAL WEATHER

engine. Low idling speeds during extremely

cold temperatures can result in incomplete

combustion and heavy deposit formations

a. Extreme Cold

on the valves.

(1) General. Extensive preparation of the vehicle

engine up to operating temperature.

is required when extreme cold weather is anticipated.

Extreme cold causes lubricants to thicken or congeal,

(6) At Halt or Parking.

presents a risk of freezing batteries and diminishes their

(a) Park vehicle in sheltered place if possible.

electrical efficiency, can crack electrical insulation to

Cover to protect engine, accessories, and

cause short circuits, prevents fuel from vaporizing readily

controls from ice and snow.

to form the combustible mixture necessary for starting,

(b) Run vehicle onto planks to `prevent tires

causes various materials to become hard, brittle, and

from freezing to the ground. Block up forks.

easily damaged. You must make sure the cooling system

has been filled with the appropriate anti-freeze solution

tires and cylinders before it freezes.

to protect the system against sub-freezing temperatures.

(d) In extremely cold weather, remove the

batteries and store them in a moderately

(2) Cooling System. Before the cooling system is

warm area. Reinstall the batteries just before

drained and filled, inspect the system for leaks and

you start the engine.

general condition. All deteriorated or damaged hoses

must be replaced. Make sure that all clamps are tight and

b. Extreme Heat.

that drain cocks are properly closed. When anti-freeze

is added to the cooling system, be sure ample space is

(1) General. Check temperature light frequently

allowed for the required amount of anti-freeze required.

for indication of overheating. Allow engine to idle slowly

Be sure you operate the engine for 15 minutes to allow

when it is overheated until temperature is reduced

the solution to properly mix.

indicated by light going out.

(2) Cooling System.

(3) Lubrication. Be sure that the correct grade of

lubricant is applied to the lubrication points. If necessary,

(a) Drain, flush, and refill cooling system.

drain and refill if the lubricant grade is not correct for

(b) Check coolant level at frequent intervals and

cold weather operation.

keep radiator cap tight.

(4) Fuel System. Be sure precautions are taken to

other foreign matter.

eliminate water and moisture from the fuel system by

(d) Check fan belt tension frequently.

draining and flushing the fuel tank, draining off any

(3) Lubrication. Lubricate the vehicle with correct

water from the fuel tank and filters at the end of each

grade of lubricants in accordance with the lubrication

day's operation, replacing the fuel filter elements, and

chart. Change filter elements at shorter intervals than

completely filling the fuel tank after each operating

normal.

period to avoid water condensation. The fuel tank must

not be allowed to remain partially empty over long

(4) Air Cleaner. Service air cleaner at shorter than

periods of time and all ice and snow must be completely

normal intervals.

removed from around the filler opening before refilling

the fuel tank.

(5) At Halt or Parking. Park the vehicle in a

shaded area if possible.

(5) Engine Operation.

c. Rainy or Humid Conditions. Keep vehicle protected

(a) Use the cold weather starting aid to start the

when not in use. Dry off seat and wiring to prevent forma-

engine.

tion of mildew. Keep fuel tank full. Service filters more

(b) Run the engine at reduced speed only long

frequently than normal. Keep all moving parts well

enough to circulate the oil through the

lubricated.

2-21