ENGINE 6-7
F ig . 12—Ignition Timing Marks
2. Start engine and run at idle speed (see tune up chart).
3. Aim timing light at timing tab.
NOTE:
The markings on the tabs are in 2°
increments (the greatest number of markings
on the
“ A ”
side of the “ O "). The “ O " marking
is TDC and all BTDC settings fall on the
“ A ”
(advance) side of “ O ".
4. Adjust the timing by loosening the distributor clamp
and rotating the distributor body as required, then
tighten the clamp.
5. Stop engine and remove timing light and reconnect
the spark advance hose.
Adjust Idle Speed and M ixture (Fig. 13)
1. As a preliminary adjustment, turn idle mixture
screws lightly to seat and back out 3 turns.
C A U TIO N :
Do not turn idle mixture screw
tightly against seat or damage may result.
2. With engine running at operating temperature (air
cleaner installed and choke valve wide open); adjust
idle speed screw to bring idle speed to specified
rpm (automatic transmission in drive,
manual
transmission in neutral).
NOTE:
On air conditioning vehicles, turn air
conditioning “ O F F " except L-4 and L-6 engines
F ig . 13—Idle Speed and M ixture Screws
with automatic transmission where idle speed is
set with air conditioning “ ON” .
3. Adjust idle mixture screw to obtain highest steady
idle speed. Adjust idle speed screw to recommended
rpm on “ DECAL".
NOTE:
Idle speed adjustment for L-6 engines
and Powerglide transmissions with idle solenoid
is as follows: adjust idle speed to 500 rpm by
adjusting solenoid plunger hex only. Disconnect
wire at solenoid and observe idle speed. De
energizing the solenoid allows the throttle lever
to seat against the carburetor idle screw. Adjust
the carburetor idle screw as necessary to obtain
400 rpm.
4. Adjust mixture screw in to obtain a 20 rpm drop
(lean roll).
5. Adjust mixture screw out 1/4 turn.
6. Repeat steps 4 and 5 for second mixture screw (if
so equipped).
7. Readjust speed screw if necessary to specified idle
rpm.
ADDITIONAL CHECKS AND ADJUSTMENTS
Testing Crankcase Ventilation V a lv e (Fig. 14)
1. Connect tachometer and vacuum gauge as for idle
speed and mixture adjustment.
2. Set parking brake, start engine and adjust idle speed
and mixture.
3. Disconnect ventilation hose at valve, block opening
of valve and read engine rpm change.
4. A change of less than 50 rpm indicates a plugged
ventilation valve - replace the valve.
Cylinder Balance Test (Fig. 15)
It is often difficult to locate a weak cylinder. A com
pression test, for example, will not locate a leaky intake
MIXTURE
SCREW
SPEED
SCREW
CHEVROLET TRUCK SERVICE MANUAL
Содержание 10 Series 1968
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Страница 52: ...HEATER AND AIR CONDITIONING 1A 21 Fig 32 Charging Schematic CHEVROLET TRUCK SERVICE MANUAL...
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Страница 128: ...BODY IB 61 Fig 135 A uxiliary Seat CHEVROLET TRUCK SERVICE MANUAL...
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Страница 133: ...Fig 5 4 0 6 0 Single A xle Truck Frame E x c Tilt Cab...
Страница 135: ...Fig 7 4 0 6 0 Series Tilt Cab Truck Frames...
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Страница 223: ...REAR SUSPENSION AND DRIVE LINE 4 54 Fig 101 Forward Rear Axle Assembly Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 299: ...BRAKES 5 56 Fig 88 Frame Mounted Vacuum Single Diaphragm Power Brake Installation CHEVROLET TRUCK SERVICE MANUAL I...
Страница 331: ...BRAKES 5 88 Fig 126 Stopmaster Brake Components Automatic Adjuster with Fail Safe CHEVROLET TRUCK SERVICE MANUAL...
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Страница 411: ...ENGINE FUEL 6M 18 Fig 18A V 8 Typical CHEVROLET TRUCK SERVICE MANUAL...
Страница 412: ...ENGINE FUEL 6M 20 ENGINE FUEL 6M 19 Fig 21 A CE100 200 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 413: ...ENGINE FUEL 6M 20 Fig 2 2 A C S K A 1 00 200 CS300 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 414: ...ENGINE FUEL 6M 21 Fig 25A CS PS SS400 CS M S SS500 CS600 TSOOO With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 470: ...CLUTCHES AND TRANSMISSIONS 7 7 Fig 14 Clutch Linkage Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 587: ...ELECTRICAL BODY AND CHASSIS 12 2 Fig 1 Fuse Panel CHEVROLET TRUCK SERVICE MANUAL...
Страница 591: ...ELECTRICAL BODY AND CHASSIS 12 6 CA SA MA 50 60 CHEVY VAN Fig 9 Front Lighting Assemblies CHEVROLET TRUCK SERVICE MANUAL...
Страница 596: ...ELECTRICAL BODY AND CHASSIS 12 11 Fig 15 Electrical Components Conv Cab CHEVROLET TRUCK SERVICE MANUAL...
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Страница 622: ...ELECTRICAL BODY A N D CHASSIS 12 37 IGNITION SWITCH Fig 44 Engine Compartment PA20 30 CHEVROLET TRUCK SERVICE MANUAL...
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Страница 633: ...ELECTRICAi BODY A N D CHASSIS 12 48 Fig 55 Engine Compartment SE50 60 02 62 CHEVROLET TRUCK SERVICE MANUAL...
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