07 1963 CH-Engine Tune-Up

SECTION 7
ENGINE TUNE-UP
GENERAL DESCRIPTION
This section outlines those changes and additional cedures are outlined in the 1961 Passenger Car Shop
procedures required for tune-up of current passenger Manual. Specifications for all 1963 carburetors are
car engines that differ from the procedure outlined in shown in Section 16 of this manual.
the 1961 Shop Manual.
The all-new six cylinder engine and the V-8 engine Delcotron Generator and Regulator Check
for 1963 are equipped with positive crankcase ventila An instrument test of Delcotron output and
tion and Delcotron AC charging systems as standard regulator setting should not be made as a regular
equipment. tune-up test; the condition of the battery indicates
Tune-up procedures are essentially the same as out that they be made. At each tune-up the battery
lined in the 1961 Shop Manual except as shown below. should be checked for excessive use of water and the
battery’s state of charge should be measured hydro
Fan Belt Adjustment meter test. Overcharging, indicated by excessive use
Fan belts should be adjusted midway between of water and undercharge on hydrometer 1.225 or
pulleys fig. 1 using a strand tension gauge Tool less, indicates regulator and generator output tests
J-7316. Adjust the fan belt by moving generator or should be performed as outlined in Section 9.
idler pulley to obtain a gauge reading of 75 ± 5 lbs.
Carburetor adjustments for new automatic choke Positive Crankcase Ventilation System
carburetors 6 cylinder are outlined in Section 10 of refer to fig. 2 and fig. 3
this manual and all V-8 carburetor adjustment pro- All 1963 Chevrolet engines have either "positive" or
"closed" positive ventilation systems utilizing mani
Fig. 1-Fan Belt Adjustment Fig. 2- Positive Ventilation V-8
PASSENGER CAR SHOP MANUAL SUPPLEMENT

ENGINE TUNE-UP 7-2
3. a. 4 and 6 cylinder engines-Remove valve from

rocker arm cover with hose still connected,
plug the open end of the valve and read engine
rpm change.
b. 8 cylinder engine-Disconnect ventilation hose
at valve on carburetor base, block opening of
valve and read engine rpm change.
4. A change of less than 50 rpm indicates a plugged
ventilation valve metering hole-replace the valve
and adjust idle speed and mixture.
CRANKCASE VENTILATION TESTER METHOD:

A.C. TYPE CT-i TESTER
1. Remove oil filler cap and install tester adapter
with tube connector.
Fig. 3-Positive Ventilation L-6
2. Remove oil gauge dipstick and seal the opening
with a plug or tape.
fold vacuum to draw fumes and contaminating
vapors into the combustion chamber where they are 3. Closed Positive Ventilation System-Disconnect
burned. The crankcase ventilation system has an air cleaner to oil filler tube or rocker cover hose
important function and should be understood and at air cleaner and plug the end of hose with tape
serviced properly. or a plug.
In both positive and closed crankcase ventilation, 4. Connect rubber hose to tester base and to filler
air is drawn through the engine, through a regulating cap adapter, then adjust the selector knob on
valve and into the manifold, drawing crankcase vapors base of tester for valve being tested. see chart
and fumes with it to be burned. Positive ventilation below
uses a vented oil filler cap for clean air intake to the 5. Start engine and allow to run at normal idle.
engine, while the closed positive ventilation system 6. Hold tester upright and make sure there are no
draws the clean air from the carburetor air cleaner kinks in the hose. Look directly into viewing
and has a non-vented oil filler cap.
windows and observe indicator color.
Positive ventilation valve are designed specifically 7. A reading of green indicates a proper functioning
for each engine to control the amount of flow from valve. Any other reading should be verified by
the crankcase to the manifold. VALVES SHOULD
installing a new valve and retesting to be sure the
NEVER BE CHANGED FROM ONE SIZE ENGINE
valve was at fault rather than engine seals. A green
TO ANOTHER. reading with new valve indicates first valve was
The crankcase ventilation valve and the vented oil bad-a duplication of first reading, with new
filler cap will eventually plug and become ineffective, valve, indicates other engine trouble, the original
therefore, the valve should be tested and the vented valve was good.
oil filler cap should be washed in solvent, blown dry
with compressed air and be re-oiled at regular
Corvair !
intervals. See section 0. ENGINE 145 Cu. lfl. 153.4 Cyl.
6 Cyl. 194.6 CyJ.
230
6 CyJ.
II 292
9 CyJ.
All
V-8
Two methods for testing the ventilation valve are
as follows: Part Production 5649994 5649995 5649998 5649997 5649996
No. Service Pkg. 5649688 6418438 6418440 6418439 5649689
Valve Type No. CV 584 CV 607 CV 609 CV 608 CV 590
ENGINE RPM DROP METHOD:
LABEL Red Print White Print White Print Black Print Red Print
Color Code on on on on on
1. Connect tachometer and vacuum gauge as for Grey Grey Red White White
idle speed and mixture adjustment.
CT-i Tester Setting Not 2 2
2. Set parking brake and start engine. Used

ENGINE TUNE-UP 7-3
1963 PASSENGER CAR ENGINE TUNE-UP SPECIFICATIONS

ENGINE 230 283 327 327 409 409 409
H.P. 140 195 220 300 340 400 425
WCFB
Carburetors BC 2GC or AFB 4GC AFB Dual
4GC AFB
Compression PSI 130 150 160 160 150 150 150
Note 1
Make and Colder AC-44N AC-44 AC-43 AC-C42N
SPARK Number STD. AC-46N AC-45 AC-44
PLUGS Hotter - - AC-45 AC-44N
Gap .035"
Point
Ignition Dwell 31°-34° 28°-32°
Distrib
utor Point .019" New- .016" Used
Gap
Point Arm
Spring Preset at 19-23 oz.
Tension
Condenser .18-.25 Microfarad
Fan Belt 75 ± 5 Lbs. Using Strand Tension Gauge
Polyure- Polyure- Paper
Air Cleaner thane thane Replace
Note 2 wash and Paper Element Wash and
Reoil Reoil
TAPPET Inlet Hydraulic-One Turn to Center Plunger Mech.-.012 .018®
CLEAR- -
ANCE Exhaust Hydraulic-One Turn to Center Plunger Mech.-.020 .030®

8° BTDC
40
Ignition Timing BTDC Nominal Nominal 10° BTDC
Note No. 4 Range 4°-8° Range Nominal 12 BTDC Nominal
6°-12°
Syn. 450-500 750 750
Engine Idle Auto.
RPM In Drive 450-500 -
FUEL Press. 33/ T. 5 to 6/ PSI 7 to 83/ PSI

PUMP 43/ PSI
Vol. - One Pint in 30 to 45 Seconds
Cooling System
Radiator 13 PSI
Pressure
Crankcase A.C. A.C. CV-590
Vent Valve CV-609
j
Note 1-All plugs removed and throttle wide open.
Note 2-Paper element-check at 1st 12,000 and each 6,000 miles thereafter. Polyurethane each 12,000 miles.
®Note 3-Sustained high speed.
Note 4-Spark advance line disconnected and vacuum opening plug.

07 1963 CH-Engine Tune-Up

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SECTION 7

Fig. 1-Fan Belt Adjustment Fig. 2- Positive Ventilation V-8

PASSENGER CAR SHOP MANUAL SUPPLEMENT

3. a. 4 and 6 cylinder engines-Remove valve from

CRANKCASE VENTILATION TESTER METHOD:

PASSENGER CAR SHOP MANUAL SUPPLEMENT

1963 PASSENGER CAR ENGINE TUNE-UP SPECIFICATIONS

ANCE Exhaust Hydraulic-One Turn to Center Plunger Mech.-.020 .030®

FUEL Press. 33/ T. 5 to 6/ PSI 7 to 83/ PSI

PASSENGER CAR SHOP MANUAL SUPPLEMENT

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