Ford COUGAR 1968 Shop Manual page 436

G R O U P 9
-
Ignition System
FIG. 16
- Distributor Vacuum
Advance Control Valve-Cover
Removed
vacuum reading. When the throttle is
released the distributor vacuum should
increase to more than 16 inches of
mercury and remain there for a mini-
mum of one second. The distributor
vacuum should fall below six inches
of mercury within three seconds.after
the throttle is released.
10. It is normal during this per-
iod for a buzzing sound to be heard.
If it takes less than one second or
more than three seconds for the dis-
tributor vacuum to fall below six
inches of mercury, adjust the valve.
Turning the spring end adjusting screw
counterclockwise will increase the
time that the distributor vacuum re-
mains above six inches of mercury-
after the throttle is closed. One
turn of the adjusting screw will
change the valve setting by approxi-
mately one half inch of mercury. If
the valve cannot be adjusted to speci-
FIG. 17
- Distributor Vacuum
Control Valve
in four seconds after the throttle
is closed, readjust or replace the
dashpot.
12. T o check the distributor
vacuum advance control valve for a
possible diaphragm leak, connect a
vacuum gage into the vacuum hose
connecting the valve to the intake
manifold vacuum connection. Use a
tee fitting with the same diameter as
the inside diameter of the vacuum
hose (114 inch I.D.). Clamp the
vacuum hose connecting the valve to
the distributor. Clamp the hose con-
nection between the valve and car-
buretor. Start the engine and operate
at normal idle speed. Note indicated
vacuum reading. Place a clamp on
the vacuum hose connectirrg the valve
to the intake manifold (between the
valve and the vacuum gage tee).
Note Reading: If the second reading
indicates a higher vacuum than the
first replace the valve assembly.
fications, replace the vilve.
11. Replace the valve cover. Re-
DISTRIBUTOR VACUUM
CONTROL VALVE
move the tape from the dashpot plun-
(TEMPERbTURE
ger (if s a equipped) and recheck the
VA,LVE) TEST
performance of the deceleration valve.
1f the distributor vacuum does not The Distributor Vacuum Control
fall below six inches of mercury with-
Valve is shown in Fig. 17.
2 C O M M O N ADJUSTMENTS A N D REPAIRS
.
GENERAL PROCEDURES
Accurate ignition system adjust-
ments are of great importance in
the control of hydro-caibon and
carbon monoxide emissions thereby
reducing air pollution.
After any adjustment of ignition
timing and distributor point dwell,
check the distributor automatic ad-
vance for proper operation.
T o keep engine emission -control
within the limits of government reg-
ulations, the carburetor fuel mixture
and idle speed adjustments should be
checked after making ignition sys-
tem adjustments. Also the exhaust
control valve (if so equipped), crank-
case ventilation system, and vacuum
systems must be in good operating
condition. Refer to the applicable
group in this manual for maintenance
and repair procedures.
BREAKER POINTS AND
CONDENSER
REPLACEMENT
1. Make certain that all vacuum
hoses are properly routed and instal-
led.
2. Attach a tdchometer to the
engine.
3. Bring the engine up to operat-
ing temperature and be certain that
the choke plate is in the vertical
position. Engine must not be over-
heated.
4.
Note the engine idle rpm with
transmission in neutral and carbure-
tor throttle in the curb idle position.
5. Disconnect the vacuum hose
from the intake manifold at the tem-
perature sensing valve and plug or
clamp the hose.
6. Note engine idle rpm with the
hose disconnected. If no change in
idle speed, the valve is acceptable
up to this point. If there is a drop
in idle speed of 100 rpm or more,
the valve should be replaced.
7. Reconnect
the vacuum line.
Verify that the all season cooling
mixture is up to specifications, and
that the correct radiator cap is in-
stalled.
8. Cover the radiator sufficiently
to induce a high temperature condi-
tion.
9. Continue to run the engine un-
til the red high temperature light
comes on indicating an above normal
temperature.
.
I
If the engine idle speed has by
this time increased 100 rpm or more,
the temperature sensing valve is sa-
tisfactory. If not, it should be
replaced.
Dual Advance Distributors
Removal
1.
Remove the distributor cap and
the rotor.
2. Disconnect the primary and the
condenser wires from the breaker
point assembly.
'3. Remove the breaker point as-
sembly and condenser retaining
screws. Lift the breaker point assem-
bly, and condenser out of the dis-
tributor.