Cadillac 60 Series 1963 Shop Manual page 266

FUEL AND EXHAUST
10-31
Outer Throttle Shaft Arm
Secondary
Throttle Lever
Inner Throttle
Shaft Arm
Throttle Operating Rod
Flex Spring
Throttle Shaft Tang
Fig. 10-49 Secondary Throttle Linkage
5. If adjustment is required, bend shoe on primary
lever.
j. Secondary Throttle Lockout Adjustment
(Fig. 10-50)
1. Crack throttle valves and manually open and
close choke valve. Keep choke valve closed.
2. Tang on secondary throttle lever should en-
gage freely in notch of lockout dog. There should
be a .020 inch clearance between tang and notch
in lockout dog.
3. If adjustment is required, bend tang on sec-
ondary throttle lever.
4. Set lockout tang tight against stop on flange
casting and partially open secondary throttle
valve. There should be .020 inch contour clear-
ance between tang on secondary throttle lever and
lockout arm. Check clearance using .020 inch
Wire Gage.
gf
Gagej
Tool J-7712
SECONDARY THROTTLE LOCKOUT ADJUSTMENT
Fig. 10-50 Secondary Throttle Lockout Adjustment
5. If adjustment is required, bend arm which
comes in contact with flange casting at slot on
lockout tang.
6. On cars equipped with Air Conditioner, install
idle speed-up control by securing bracket to bowl
cover with two screws.
26. Carburetor Adjustments
on Engine
The following adjustments are made with the
carburetor assembled on the engine. It is neces-
sary that these adjustments be performed in the
exact sequence presented. The positive crankcase
ventilator valve should be serviced before making
adjustments on the engine as this valve affects
the air to fuel ratio, Note 1.
a. Idle Speed and Mixture Adjustment
1. Disconnect parking brake vacuum diaphragm
line from neutral safety switch and put tape over
switch opening to prevent any air leak.
NOTE: Hose must be disconnected at this
location to include any calibrated leakage in the
balance of the system and to maintain vacuum
for the air conditioning controls.
2. Connect tachometer to engine and set park-
ing brake securely. Place transmission selector
lever in neutral.
3. Connect vacuum gage to throttle check vacuum
hose at rear of engine with a tee.
4. Start and warm engine to normal operating
temperature. Be sure that choke is fully off and
that carburetor is on slow idle, with primary and
secondary throttle valves closed. Be sure that
throttle check is not holding throttles open.
5. Remove air cleaner.
6. On cars equipped with Rochester 4GC carbu-
retor, remove spark plug wires and clip from
their bracket to gain accessibility to idle mixture
screws.
7. Loosen front and rear TV rod lock nuts at
carburetor throttle lever trunnion.
8. Place transmission selector lever in either
"DR" position.
9. Set idle speed to not more than 480 rpm by
adjusting air adjustment screw. Air Conditioner
should be operating on cars so equipped. Turning
air adjustment screw outward increases engine
speed, but also leans the mixture supplied to the
manifold. This must be compensated by adjustment
of the idle mixture adjustment screw. Always
adjust idle mixture screw last. Use minimum
amount of air possible to obtain proper idle speed.