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Hot Starting/Unloading
Rich mixtures must be prevented during hot
starting/unloading situations. Depressing the
accelerator pedal to fully open the throttle
valve during starting will prevent high vac-
uum from reaching die cranking signal valve
and will facilitate starting.
Hot Idle Compensator
Extremely hot operation conditions can cause
rich mixture conditions that detrimentally af-
fect engine smoothness and idling. To rem-
edy this, a thermostatically controlled valve
on the top side of the air meter throttle valve
allows additional air to bleed into the mani-
fold and restore the idle mixture to a correct
ratio.
Idle Speed and Fuel Adjustments
Idle speed and fuel adjustments require pre-
setting of the idle-speed and idle-fuel adjust-
l
ing screws \
/z turns out from their fully closed
position. Start the engine and adjust the idle-
Idle speed adjustment
Idle mixture adjustment
EMISSION CONTROLS AND FUEL SYSTEM
speed screw until 800-850 rpm is obtained.
Adjust the idle-fuel screw until the smooth-
est engine idle is attained. Should the two
idle-adjusting screws become completely out
of phase, purge the system or stop the engine
and repeat the entire preceding procedure.
Fast Idle-Speed and Cold Enrichment
Adjustments
Adjust the fast idle-speed by bending the en-
richment linkage until clearance between the
fast-idle cam and the adjusting screw resem-
bles the illustration. With the engine stopped,
crack the throttle valve and manually close
the cold enrichment valve. Release the throt-
tle linkage and check to see that the fast-idle
is now positioned for cold engine operation.
Release the cold enrichment valve, warm the
engine, and adjust the fast-idle screw to ob-
tain 2200 rpm. Make the cold enrichment ad-
justment by setting the cold enrichment cover
to 3 notches lean. Be sure that the valve link-
age operates freely.
Ratio Lever Stop Settings
This series of adjustments requires the use of
a manometer. Attach die manometer in a
convenient place on the vehicle and use die
two-position bracket so that the most vertical
position may be obtained. After the unit has
been leveled by means of the leveling vial,
open both water manometer valves and see if
a zero reading exists. If not, adjust the oil lev-
eling screw. If this fails to xero die indicator,
add red oil (specific gravity 0.826). Back off
the leveling screw for this procedure.
cury (Hg) manometer and plugs located in the
adapters. Install the tee fitting in die most
easily accessible fuel nozzle circuit. Attach the
fuel pressure line to die tee fitting and the
mercury manometer. Check die fuel trap in-
let to see diat it is properly positioned in die
line. Clamp the venturi signal line to die
cranking signal valve line and die water ma-
nometer. Check the clamp to be sure it is
tightiy closed on die line. If it isn't, high vac-
uum during engine cranking will cause die
red oil to be lost. Replace die main dia-
phragm vent tube widi die large rubber tube.
Adjust die scale of die mercury manometer
to read zero inches. Recheck die manometer
leveling vial and make any necessary adjust-
ments. This completes the installation.
begins widi a visual check of die unit for
physical defects. Widi die engine warmed up,
Remove both hose adapters on the mer-
The economy stop adjustment procedure
169
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