Checking For Leaks; Speed Control; Manifold Gauge Set - Lincoln Continental 1964 Shop Manual

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PART 16-1-GENERAL VENTILATING, HEATING, AND ACCESSORIES SERVICE
16-7
CHART 4- Va(uum Drop
vs. Vents-Heater Lever Position
Vents-Heater
Lever Movement
DE-ICE to HEAT
HEAT to OFF
OFF to L
L toR
R to R-L
R-L to FRESH
FRESH to REC
6.
If any vacuum drop is less than
indicated, check for pinched lines,
plugged lines, plugged fittings, or par-
tial cycle due to a binding door.
If any vacuum is greater than that
indicated, check for leaks, lines not
connected, or defective components.
If a single vacuum actuator is mal-
functioning, check the vacuum at the
actuator (Chart 3). If the vacuum
is within limits, the actuator is de-
fective or the door is binding.
CHECKING FOR LEAKS
Attach the manifold gauge set
(Fig. 5). Leave both manifold gauge
valves at the maximum clock wise
position. Set both service valves at
the center position. Both gauges should
now show approximately 60 to 80
pounds prEJssure at 7 5o F. lf very
little or no pressure is indicated, leave
the vacuum pump valve closed, open
the Refrigerant-12 tank valve, and
set the low pressure manifold gauge
valve to the counterclockwise posi-
tion. This opens the system to tank
pressure.
Check all connections, and the
compressor shaft seal for leaks, using
a flame type leak detector (Fig. 6).
Follow the directions with the leak
detector. The smaller the flame the
more sensitive it is to leaks. There-
fore to insure accurate leak indica-
tion keep the flame as small as
possible. The copper element must be
red hot. If it is burned away, replace
the element.
Vacuum Drop
Inches of Mercury
0.25-2.5
2.5-5.5
0.25-2.0
0.25-2.0
0.25-2.0
0.5-3.0
0.25-2.5
Hold the open end of the hose at
each suspected leak point for two or
three seconds. The flame will nor··
mally be almost colorless. The slight··
est leak
will
be indicated by a bright
color
to
the flame. Be sure to check
the manifold gauge set and hoses for
leaks as well as the rest of the sys-·
tern.
If the surrounding air is per-·
meated with refrigerant gas, the
leak detector will indicate this gas
all the time. Good ventilation is
necessary to prevent this situa-
tion. A fan, even in a well venti-
lated area, is very helpful in re-
TO LOW
SERVICE VALVE
FIG.
5-Manifold Gauge Set
moving small traces of refrigerant
vapor.
SPEED CONTROL
PERFORMANCE CHECKS •
After servicing the speed control
unit, the car should be road tested
for proper operation of the speed
control in both the manual and auto-
matic control positions. The speed
control unit cannot be tested with
the car on a hoist or jack.
MANUAL OPERATION
1. Set the selector dial for any
desired speed.
2. With the car in motion, a resist-
ance should be felt at the accelerator
pedal when the pre-selected speed
is reached.
3. Drive while holding the accel-
erator pedal against the back pres-
sure. The car should maintain a con-
stant speed at the selected setting even
when traveling up or down hills.
4. Push through the accelerator
resistance to increase car speed
above the speed control selector set-
ting. The resistance should continue
at all speeds above the pre-set speed.
K1543-A