After 15·20 seconds, the
end.
(Item
6)
of
the
resistance
gets
incandescent
through
the
passage
of
current, and the developed heat
determines a temperature rise
of
the air inside
the manifold.
As the switch
is
turned further
it
closes the con-
tact
of
the starting
motor
which starts cranking
the engine.
Once starting has taken place, the released
switch
lever returns automatically
to
the
original·
position, the
electric
circuit
is
interrupted and
the
air
flowing
through the manifold
cools
the
valve rapidly. The push rod
blocks
the ball again
on
its
seat and the fuel is kept
out
of
the starting
aid.
When engine is hot, starting aid operation is ex-
cluded by turning the
switch
counterclockwise.
FIG. A.IV/12 STARTING AID CROSS·SECTION
1.
Push rod;
2.
Valve body;
3.
Ball valve;
4.
End
screw;
5.
Heating coli; &.Ignition coli;
7.
Shield;
8.
Valve holder
Engine·
37
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