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2
VACUUM TEST - PAGE 2-2
Paragraph 4 should read: An engine in good
condition will show a steady or slightly fluctuating
high vacuum reading of from 17" to 18". Vacuum
readings are affected by altitude. Over 2000 feet the
vacuum gauge will show about one inch lower for
each one thousand feet elevation.
SPARK PLUGS - PAGE 2-4
A new spark plug H-8 Champion will replace
Champion J-7 or J-9 for cast iron heads and replace
Champion H-10 for aluminum heads. The new H-8
plug will be the new service replacement for all
models in the 480490 series.
VALVES AND TAPPETS - PAGE 2-4
Valve clearances are the same for 6 and 8 cylinder
engines as follows: Intake; 6 or 8 cylinder, .008
Exhaust 6 or 8 cylinder, .010.
GENERATOR TEST - PAGE 2-13
A few of the 490 series cars were equipped with
a
"SHUNT
WOUND"
"VIBRATING TYPE" current-voltage regulator.
These units can be identified as follows: Generator
No. GDZ-6001-B stamped on generator name plate.
Voltage Regulator No. VRP-6002-A stamped on
upper face of regulator base. For Adjustment and
Repair procedures refer to your "500 Series" proce-
dure manual under "Engine Tune-Up" Section 2 and
Section 6, "Electrical".
FUEL PUMP TEST - PAGE 2-14
Paragraph No. 1 should read: Remove and clean
the fuel pump sediment bowl and screen on A/C
pumps. It should not be necessary to clean the
Carter Fuel Pump screen except when the pump is
removed for a general overhaul.
SECTION 2
ENGINE TUNE-UP
generator
an
d
a
Paragraphs No. 4, 5 & 6 should read: Start the
engine and run engine at 1800 RPM. Normal pres-
sure should be 3-1/2 to 4-1/2 pounds on the standard
A C pump, 3 to 4 pounds with A C combination fuel
and vacuum pump and 4 to 5 pounds with Carter
M-729-SZ pumps. (Number stamped on front face
of mounting flange.) If pressures are lower than the
above, examine the fuel line for dents or kinks
which would restrict the flow of fuel.
Stop the engine and watch pressure gauge. Pres-
sure should not fall perceptibly after engine is
stopped.
If pressure falls, leaking pump valves are indicated.
If pressure is below specifications, attach a
vacuum gauge to the inlet port of pump and
operate engine. Gauge should show 6" of mercury
or higher for satisfactory operation.
If fuel pump pressure is low, but vacuum reading
is satisfactory, difficulty is in the gasoline tank or
lines to the pump.
If pump pressure and vacuum are both low, pump
should be overhauled or replaced.
AIR CLEANER OIL BATH - PAGE 2-15
Paragraph 5 should read as follows: On all 480
series 6 cylinder engines and 490 series 6 cylinder
engines including car serial No. 492-51250 with
aluminum manifolds and serial No.491-76450 with
cast iron manifolds, the intake manifold carburetor
mounting flange was machined on the same plane as
the cylinder head resulting in a rearward tilt of the
carburetor due to the angle of securing the engine in
the frame. On these cars it is recommended to refill
the reservoir with 3/4 of a pint of 50 S.A.E. engine
oil for temperatures above 32° F and 20 S.A.E. for
lower temperatures.
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