Speed Control Unit-Cover Removed - Lincoln Continental 1964 Shop Manual

{319)
PART
16-5
16-25
SPEED CONTROL
Section
Page
......... 16-25
Section Page
1 Description and Operation .....
2 In-Car Adjustments and Repairs.
3 Removal and Instaiiation ................. 16-26
. ........ 16-25
D
DESCRIPTION AND OPERATION
The speed control unit is governed
directly by car speed. A conventional
speedometer drive cable, connected
to the input shaft at the bottom of
the control unit, drives a spring
loaded governor in the control unit
and at the same time drives a second
cable which extends to the speed-
ometer head by means of a 1 : 1 gear
set. The spring loading of the gov-
ernor is varied and controlled by
turning the selector knob located
on the instrument panel. For ex-
ample, with the selector knob set at
50 mph the tension in the governor
spring is such that when the car
speed reaches 50 mph the force of
rotation of the governor weights is
balanced by the governor spring ten-
sion.
When the speed control unit is
used as a mechanical speed reminder
device, a resistance or back pressure
is felt at the accelerator pedal at
and above the speed selected on the
selector dial.
The position of the back pressure
point will vary with the road grade.
The car speed can be increased
ai any time by pushing the accelera-
tor through the back pressure. Re-
lease the pressure on the accelerator
pedal and the car will slow down
normally.
Turn the selector dial higher or
lower to increase or decrease the
speed setting. Back pressure will
always be felt when selected speed
is reached.
The automatic speed control fea-
ture can be put into operation by
moving the slide switch to the lock
position (it will return to the ON
position when released), when a
pre-selected speed is reached and
the accelerator pedal is held against
the reaction pressure.
The speed control will now oper-
ate automatically without the need
of foot pressure on the accelerator
pedal. The control unit motor will
advance or retract the acceleration
pedal to maintain the pre-selected
speed. The speed of the vehicle may
be increased or decreased by turning
the selector dial while the speed
control is operating automatically.
The automatic feature is released
by depressing the brake pedal within
the first
1
A -inch of travel, moving
the slide switch to the OFF position,
or by turning the ignition switch
to the OFF position. Any of these
operations breaks the electrical cir-
cuit and the unit returns to manual
control.
Inside the control unit, an activa-
tor assembly riding up and down on
a shaft, moves the contact arm be-
tween motor points Nos. 1 and 2,
located on the magnet assembly.
Electrical contact between the point
on the contact arm and either motor
point activates a 12-volt reversible
motor that rotates a drive screw.
When the drive screw rotates, a nut
on the screw moves the entire mag-
net assembly to the position where
equilibrium is reached between the
governor weights and the governor
EJ
IN-CAR ADJUSTMENTS AND REPAIRS
LINKAGE
1. Remove the cotter key from
the accelerator linkage and pull the
linkage from the exterior arm.
2. Start and run the engine until
it operates at a slow idle.
3. Insert the gauge sleeve over the
gauge bolt and hold the exterior arm
securely against the gauge pin (Fig.
2).
The gauge toot is supplied in Speed
Control Kits. However, if the gauge
tool is not available, use a piece of
.;),,-inch I.D. tubing of ~~n-inch walt
spring. When the pre-selected road
speed is reached a reaction pressure
is felt on the accelerator pedal.
When the car tends to go slower
than the pre-selected speed, as would
be the case in going up a hill, the
action of the governor weights causes
the contact arm to contact motor
point No. 1. The motor now rotates
in the opposite direction; thus, the
magnet assembly moves to allow the
throttle to be opened, to maintain
the pre-selected speed.
When the car travels downhill, it
tends to travel faster than the pre-
selected speed. The resulting action
of the governor weights moves the
contact arm to motor point No. 2,
causing the motor to rotate the drive
screw and move the magnet to close
the throttle.
FIG.
1-Speed Control
Unit-Cover Removed
thickness, two inches long.
4. Adjust the swivel on the throt-
tle linkage until the linkage will as-
semble to the exterior arm.
5. Replace the linkage and cotter
pin.
6. Remove the gauge sleeve.