Hudson 1948 - 1952, Service Manual

Page: 37 / 333

ENGINE TUNE-UP 2 -17
2. Connect a starter battery tester directly across the battery
and set load to 50 amperes, or use the equivalent in seal
beam lamps.
3. Run engine to approximately 2000 R.P.M. amperage
reading should be 36 amperes. If it is not within a toler-
ance of one to two amperes of this reading, the regulator
should be removed and taken to an authorized Auto-Lite
dealer for replacement.
NOTE: If car is out of warranty, remove the voltage cover
and adjust the current regulator spring hanger to the nec-
essary 36 ampere output. To prevent operation of the v o
It a g e regulator unit while making this adjustment, place
a jumper across the voltage regulator points. For final
checking, the regulator cover must be in place on regulator.
CAUTION: Momentarily touch the negative battery cable
to battery negative post to determine that there is no
sparking between the battery negative post and cable ter-
minal, then connect negative cable.
CURRENT REGULATOR ADJUSTMENT:
1. To adjust operating amperage, remove cover and
change armature spring tension by bending the lower
spring hanger. Increasing tension raises the operating
amperage; decreasing the tension lowers it.
2. Replace cover and re-check. Stop engine and re-start after
each adjustment. Take readings with cover in place.
FUEL PUMP
FUEL PUMP TEST:
The fuel pump should be tested to make certain that it will
draw an adequate supply of fuel from the tank and deliver
the fuel to the carburetor at a constant pressure under the
varying conditions of fuel consumption and engine speed.
1. Remove and clean the fuel pump sediment bowl and
screen.
2. Replace the screen if damaged.
NOTE: If the combination fuel and vacuum pump is used,
remove and clean the air filter screen located under the
cover at the top of the pump.
3. Make sure all connections and cover screws are tight after
replacement.
FIGURE 27
4. Disconnect the fuel line at the carburetor and connect the
fuel pump gauge, Figure 27.
5. Start the engine and run at 1800 R.P.M. Normal pressure
should be 3 to 4 pounds with AC combination fuel and
vacuum pump and 3-1/2 to 4-1/2 pounds with Carter
M-729SZ. Stop engine and watch pressure gauge. Pressure
should not fall perceptible after engine is stopped.
6. If pressure falls, leaking pump valves are indicated.
7. If pressure is below specifications, attach the vacuum
gauge to the inlet port of the pump and operate engine.
Gauge should show a minimum of 6 inches of mercury
for satisfactory operation.
VACUUM BOOSTER CHECK:.
To check the action of the vacuum portion of the combi-
nation fuel and vacuum pump, connect a vacuum gauge to
the inlet port and disconnect outlet. Gauge should show
8-1/2" of mercury at 120 R.P.M. and 12" at 1800 R.P.M.
MANIFOLD HEAT CONTROL:
Check the manifold heat control valve to see that spring is
in good condition and valve is free. Should the Damper
Shaft be found to be stuck, remove the thermostat and
springs, apply penetrating oil or kerosene and tap the shaft
for end play to break the carbon and corrosion. The shaft
should not be oiled. When properly freed, carefully check
springs and thermostat before Installing and replace them if
weak.