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ENGINE 6-6
CHOKE VALVE
COMPLETELY
CLOSED
PULL UPWARD O N
ROD TO END OF
TRAVEL
BEND ROD
TO ADJUST
ROD IN BOTTOM
OF SLOT
BOTTOM OF
ROD SHOULD
EVENWITH
TOP OF
HOLE
CHOKE VALVE
CLOSED
BOTTOM OF
ROD SHOULD
BE EVEN WITH
TOP OF HOLE
TOP OF ROD
SHOULD BE EVEN
WITH BOTTOM
OF HOLE (CHOKE
CLOSED)
^ . . B E N D ROD TO
ADJUST
_ P U L L DOWNWARD
O N ROD TO C O N -
TACT STOP
L6 (TYPICAL)
V8 327-275 HP
V8 350-295 HP
BEND ROI
TO ADJUST
PULL UPWARD O N
ROD TO CONTACT
STOP O N BRACKET
ALL V8 (EXCEPT 327-275 HP
AND 350-295 HP)
Fig. 11 - Remote Choke Adjustment
sequence outlined on Torque Sequence Chart. A slight
leak at the intake manifold destroys engine performance
and economy.
Service Fuel Lines and Fuel Filter
1. Inspect fuel lines for kinks, bends or leaks and cor-
rect any defects found,
• • •
2. Inspect filter and replace if plugged.
NOTE:
If a complaint of poor high speed per-
formance exists on the vehicle, fuel pump tests
described in Section 6M should be performed.
Service Cooling System
1. Inspect cooling system for leaks, weak hoses, loose
hose clamps and correct coolant level, and service
as required.
NOTE:
A cooling system pressure test, as de-
scribed in "Additional Checks and Adjustments"
in this section, may be performed to detect
internal or external leaks within the cooling
system.
Check and Adjust Accelerator Linkage
1. Disconnect accelerator rod at carburetor throttle
lever.
2. Hold carburetor throttle lever in wide position.
3. Pull accelerator rod to wide open position. (On ve-
hicles equipped with automatic transmission, pull
through detent).
4. Adjust accelerator rod to freely enter hole in carbu-
retor throttle lever.'
NOTE:
Accelerator linkage is outlined in de-
tail in Section 6M.
5. Connect accelerator rod at throttle lever.
Service Crankcase Ventilation (Fig. 10}
All engines have either "Positive" or "Closed Positive"
ventilation systems utilizing manifold vacuum to draw
fumes and contaminating vapors into the combustion
chamber where they are burned. Since it affects every
part of the engine, crankcase ventilation is an important
function and should be understood and serviced properly.
In both "Positive" and "Closed Positive" ventilation,
air is drawn through the engine, (through a regulating
valve) into the manifold, drawing' crankcase vapors and
fumes with it to be burned. "Positive" ventilation uses a
vented-meshed cap for clean air intake to the engine,
while . "Closed Positive" ventilation system draws the
clean air from the carburetor air cleaner and has a
nonvented oil filler cap.
1. Ventilation valve may be checked as outlined under
"Additional Checks and Adjustments".
2. Inspect for deteriorated or plugged hoses.
3. Inspect all hose connections.
4. On closed positive ventilation systems, remove flame
arrestor and wash in solvent then dry with com-
pressed air.
Service Air Injection Reactor System
Inspect air injection reactor system for evidence of
leaks, deteriorated hoses, cracked air manifolds or tubes
and loose hose clamps. Inspect air injection pump belt
condition and tension. Make all necessary repairs as
outlined in "Section 6T".
Because of the relationship between "Engine Tune Up"
and "Unburned Exhaust Gases", the condition of Engine
CHEVROLET CHASSIS SERVICE MANUAL
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