Lever
Return Spring
A return spring, or restoring
spring, is a coil spring that moves something, such as a valve or
diaphragm back to its normal position and holds it there.
Lighting
Circuit
The automobile lighting circuit
includes the wiring harness, all the lights, and the various switches
that control their use. The complete circuit of the modern passenger car
can be broken down into individual circuits, each having one or more
lights and switches. In each separate circuit, the lights are connected
in parallel, and the controlling switch is in series between the group
of lights and the fuse box. The parking lights, are connected in
parallel and controlled by a single switch. In some installations, one
switch controls the connection to the fuse box, while a selector switch
determines which of two circuits is energized. The headlights, with
their upper and lower beams, are an example of this type of switch.
Again, in some cases, such as the courtesy lights, several switches may
be connected in parallel so that any switch may be used to turn on the
lights.
Lifter
Body
The valve lifter body houses the
valve lifter mechanism. The valve lifter is the unit that makes contact
with the valve stem and the camshaft. It rides on the camshaft. When the
cam lobes push it upwards, it opens the valve.
Limiting
Coil and Operating Coil
The limiting coil passes the
current from the battery to the common connection of two coils at the
lower terminal on the dash unit. This current may pass from either the
operating coil of the dash unit and the other over to the tank sending
unit. When the fuel tank is low or empty, the sliding brush cuts out all
resistance in the tank unit. Then the current will passes through the
tank unit circuit because of the low resistance, and only a small
portion will pass through the operating coil to the dash unit. This coil
is not magnetized enough to move the dash unit pointer, which is then
held at the "Empty" position by the limiting coil.
When the tank is full or partly full, the float of the tank unit will
rise to the surface of the fuel and move the sliding brush over the
rheostat, putting resistance in the tank unit circuit. This results in
more current will then passing through the operating coil to give a
magnetic pull on the pointer, which overcomes some of the pull of the
limiting coil. When the tank is full, the tank unit circuit contains the
maximum resistance to the flow of the current. The operating coil will
then receive its maximum current and exert pull of the pointer to give a
"Full" reading. As the tank empties, the operating coil loses
some of its magnetic pull and the limiting coil will still have about
the same pull so that the pointer is pulled toward the lower reading.
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