Chevrolet 30 Series 1967 Service Manual page 286

ENGINE 6-6
FLAME ARRESTO R
NO N-VEN TED C A P
CLO SED POSITIVE IN LINE (TYPICAL)
FLAME
ARRESTOR
CLOSED POSITIVE V8 (283-327) (TYPICAL)
2. Push hand choke knob in to within 1/8" of instrument
panel.
3. Loosen choke cable at carburetor bracket and adjust
cable through the clip until the choke valve is wide
open.
Instrument Hook Up
Connect vacuum gauge, dwell meter, tachometer and
timing light as recommended by the manufacturer of the
equipment being used.
Check and Adjust Dwell
1. Start engine then check ignition dwell.
2. If dwell is not within specifications, adjust dwell as
follows:
VALVE
VALVE
POSITIVE V8 (283-327) (TYPICAL)
Fig. 10—Crankcase V en tila tio n Systems
INSTRUMENT CHECK-OUT
WINDOW
r "HEX" TYPE
WRENCH
ADJUSTING
SCREW
VALVE
VENTED CAP
POSITIVE IN LINE TYPICAL
VALVE
VENTED CAP
FLAME ARRESTOR
NON-VENTED CAP
4. Tighten cable clamp at carburetor bracket and check
operation of choke valve to ensure full closed and
wide open positions.
V ENGINES
8
• With engine running at idle, raise the adjustment
screw window and insert an Allen wrench in the
socket of the adjusting screw (fig.
• Turn the adjusting screw as required until a dwell
reading of 30° is obtained. A 2° variation is allow­
able for wear.
• Close access cover fully to prevent the entry of
dirt into the distributor.
NOTE: If a dwell meter is not available, turn
adjusting screw clockwise until engine starts to
m isfire, then turn screw one-half turn in the
opposite direction to complete adjustment.
IN LINE ENGINES
• Remove distributor cap and recheck point setting.
If dwell is still not within specifications check the
distributor as outlined in Section
Check Dwell Variation
Slowly accelerate engine to 1500 rpm and note dwell
reading. Return engine to idle and note dwell reading.
If dwell variation exceeds specifications, check for worn
distributor shaft, worn distributor shaft bushing or loose
breaker plate.
Check and Adjust Ignition Timing (Fig. 12)
1. Disconnect the distributor spark advance hose and
plug the vacuum source opening.
VALVE
CLOSED POSITIVE V8 (366)
).
1 1
Y.
6
CHEVROLET TRUCK SERVICE MANUAL