Chevrolet 1973 Overhaul Manual page 500

E
Type
N
G
Displacement
I
N
Horsepower
E
CD
COMPRESSION
Standard
SPARK Make &
Number
PLUG
Cold
Gap
D Point Dwell
I
S Point Gap
T
Arm Spring Tension
R
I
B Condenser
U
T
Syn.
0
Timing
R
® ®
Auto.
DRIVE Fan P/S and Air Pump
BELT
A/C Compressor
®
AIR CLEANER
VALVE LASH
Syn.
IDLE H.D.
RPM
© Auto.
H.D.
FUEL Pressure in lbs.
PlglP
Volume
CRANKCASE VENTILATION
(l) PSI at Cranking Speed, throttle wide open — Maximum variation, 20 PSI between cylinders.
(5) Rotate cam lubricator 180° at 12,000 mile intervals — Replace at 24,000 mile intervals.
(3) At idle speed with vacuum advance line disconnected and plugged. On Step Van vehicles, use number two cylinder and
timing tab on bottom of cover. B — B.T.D.C.
(4) Do not pry against A.I.R. pump housing.
(5) CAUTION: In addition to its function of filtering air drawn into the engine through the carburetor, the air cleaner also
acts as a flame arrestor in the event the engine backfires. Because backfiring may cause fire in the engine compartment,
the air cleaner should be installed at all times unless its removal is necessary for repair or maintenance services.
Paper Element Type — First 12,000 miles, inspect element for dust leaks, holes, or other damage and replace if necessary.
If satisfactory, rotate element 180° from original installation position. Replace element at 24,000 miles. Element must not
be washed, oiled, tapped, or cleaned with an air hose. If so equipped, replace P.C.V. breather filter every 24,000 miles (do
not attempt to clean). If so equipped, clean wire mesh frame arrestor every 12,000 miles.
Oil Bath Type — The oil level in the oil bath air cleaner reservoir should be checked every 12,000 miles and sufficient
S.A.E. 50 oil added when temperature is above freezing or S.A.E. 20 oil added when temperature is below freezing.
Adding oil and servicing the cleaner will vary greatly, depending upon operating conditions.
Oil Wetted Paper Element With Polyurethane Wrap — This dual element air cleaner has extremely long life and will not
require replacement for 50,000 to 100,000 miles under normal operating conditions. Cleaning and oiling of the
polyurethane wrap should be done at 24,000 miles under normal highway or city-type operation. Service under off-
the-road or extremely dusty operations should be performed at 12,000 miles or less depending upon severity of
operating conditions.
(D See "TUNE-UP" section.
© Replace filter element located in carburetor inlet every 12 months or 12,000 miles, whichever occurs first.
* 2°B on C20 Suburban Models.
H.D. All C-K20 Series except C-K20 Suburban; All C-P30 Series and all G30 Series except Sportvans.
(F) Federal Vehicle Emission Regulations.
TUNE-UP CHART
In Line
250
100
130 psi
AC-R46T
AC-R45T
31°-34°
L.D. 6°B
4°B
H.D.
L.D. 6°B
H.D. 4°B
50 lb. Min. 75 ± 5 lbs. (Used) 125 ± 5 lbs. (New) Using Strand Tension Gauge
65 lbs. Min. 95 ± 5 lbs. (Used) 140 ± 5 lbs. (New) Using Strand Tension Gauge
L.D. 700
700
L.D. 600
700
3-1/2 to 4-1/2
L.D.
(C)
292 307
115 & 130
120
AC-R44T
.035"
.016" (Used) .019" (New)
19-23 ounces
.18-.23 microfarad
-
4°B
TDC
(F) 4°B/(C) 8°B
-
8°B
TDC
(F) 4°B/(C) 8°B
See Note (5)
Hydraulic — 1 turn down from zero lash
—
900
600
(F)700 (C)600
—
600
(F)700 (C)600 600
5 to 6-1/2
1 pint in 30-45 seconds @ cranking speed
Replace at 24,000 miles
All 10 Series; C-K20 Suburban; All G20 Series and G30 Sportvans.
California Vehicle Emission Regulations.
SPECIFICATIONS 41
V8
350
155 240 & 250
150 psi
AC-R44T
AC-R43T
29°-31°
8°B*
(F) 10°B/(C) 5°B
4°B
12°B
4°B (F) 10°B/(C) 8°B
900
600
600
600
7 to 8-1/2
OVERHAUL MANUAL
454
10°B
10°B
900
700
600
700