TM 5-3895-359-14&P
COLD WEATHER STARTING
When starting an internal combustion engine in cold
extremely low outside temperatures may not be
weather, a large part of the energy of combustion is
sufficiently high enough to ignite the fuel injected.
absorbed by the pistons, cylinder walls, coolant and in
overcoming friction.
To assist in starting an engine under low temperature
conditions, an ether starting aid cup is located at the top
Under extremely low outside temperatures, the cold oil
of the air inlet housing (Fig. 1).
walls creates very high friction and the effort required to
Starting aids are not intended to correct
NOTE:
crank the engine is much greater than when the engine
deficiencies such as low battery, heavy oil, etc. They
is warm.
are for use when other conditions are normal but the air
temperature is too low for the heat of compression to
In a diesel engine, the normal means of igniting the fuel
ignite the fuel-air mixture.
sprayed into the combustion chamber is by the heat of
the air compressed in the cylinder. This temperature is
high enough under ordinary operating conditions, but at
ETHER CUP STARTING AID
The ether starting aid cup is located at the top rear of
the air inlet housing. It should only be used as a starting
aid if necessary in cold weather.
WARNING
Ether should not be injected longer
than 1 second duration. Serious
engine damage or explosions may
result if excessive ether is injected
into the engine.
CAUTION: Do not crank the engine more than 30
seconds at a time when using the starting motor.
Fig. 1 - Ether Cup Starting Aid.
Always allow one minute intervals between cranking
attempts to allow the starting motor to cool.
10-8-22
