f. High Altitude.
(1) General. High altitude operation requires careful maintenance of the cooling system.
As altitude increases, the boiling point of coolant decreases. The pressurized cooling system will
operate at temperatures of 220 F. when properly maintained.
(2) Check all hose connections daily for signs of leaks, and be sure that radiator filler cap
is properly sealed.
Fording water up to a depth of 30 inches is possible without the use of special
equipment. Special kits are available for deep water fording (see para 2-25e). Refer to TM 9-238
for general information covering deep water fording operations.
(1) Determine water depth. Do not
exceed 30 inches.
(2) Remove flywheel housing drain
plug (2), and install it in drain port (1).
For gasoline and diesel models,
the plug is stored in the map
(3) Start engine, and be sure engine is operating normally.
Limit speed to 3 to 4 miles per hour while fording. Do not attempt to ford truck at
depths greater than 30 inches.
(4) Place transmission gearshift lever in first position and transfer shifting lever in low
position, and slowly enter water.
Do not stop in water or on bank. Avoid unnessary use of the clutch.
Do not rely on brakes until they dry out. Ater folding, remove water from brake
linings by gradual application of brakes, until braking can be accomplishment without
(5) Immediately after fording, remove flywheel housing drain plug (2) from drain port.
Secure plug in storage boss (multifuel) or stow in map compartment (gasoline and diesel).