[Illustration: The gears or “cog-wheels” are for running the fan, the
pump and other parts.]
[Illustration: THE HEART OF THE AUTOMOBILE
Cylinder added to crankcase.
The cylinders are next bolted down to the crankcase, the pistons and
crankshaft having been connected, as shown in Fig. 3. A cover is placed
over the gears to keep them clean.]
[Illustration: An oil pan or reservoir is attached to the bottom of the
crankcase to hold oil for the engine.]
[Illustration: The carburetor furnishes the gasoline vapor for the
cylinders. It is connected to the engine by a crooked pipe called the
intake manifold.
After the gasoline has been exploded a valve opens and allows the
burned gases to escape through another pipe, called the exhaust
manifold.]
[Illustration: Oil is poured in the spout which is at the left of the
carburetor. It runs down into the reservoir and is pumped up through
the engine a little at a time.