NOTE:
On engines equipped with "battery-less" charging
systems, the output should be between
12.9 and 13.9 VDC
.
Anti-Afterfire Solenoid - Carbureted Engines
The anti-afterfire solenoid, mounted to the carburetor,
operates a plunger that stops the flow of fuel through the fixed
main jet. This is controlled by the equipment ignition switch.
With the ignition switch in the
OFF
position, the solenoid
plunger closes, stopping the flow of fuel. With the switch in
the
ON
and in the
START
positions, the solenoid plunger
opens to allow normal fuel flow.
The solenoid is operating as normal if it
CLICKS
when the
ignition switch is turned
ON
and
OFF
.
If the solenoid does not
CLICK
, a problem may exist in the
equipment wiring, engine wiring, or the solenoid. Perform the
following tests in the order listed below.
Solenoid Test
1. Disconnect the wire harness electrical connector
and remove the anti-afterfire solenoid from the
carburetor (see
SECTION 6 - SERVICE ENGINE
SUBASSEMBLIES - Carburetor - Disassembly
). Wrap
with a shop towel to catch any spilled fuel.
2. Connect a jumper wire from the negative terminal of the
equipment 12V battery to either terminal of the solenoid
connector.
3. Connect a jumper wire from the positive terminal of
the equipment 12V battery to the other terminal of the
solenoid connector.
The plunger should retract freely.
When the battery connection is removed, the plunger should
return to the extended position.
Replace the solenoid if the plunger sticks or doesn't move.
NOTE:
Test the anti-afterfire solenoid when at room
temperature and when the engine is at operating
temperature. Excessive heat may cause failure.
Equipment Wiring Test
1. Turn the key switch to
OFF
.
2. Disconnect the equipment wiring harness from the
engine wiring harness.
3. Obtain a digital multimeter.
4. Attach the RED meter test lead into the equipment
wiring harness connector (side opposite of raised rib on
harness connector).
5. Attach the BLACK meter test lead to a good ground.
6. Turn the key switch to
ON
. The multimeter should display
battery voltage.
If the meter DOES NOT display battery voltage, the
problem exists within the equipment wiring harness.
Consult equipment repair manual for testing procedures.
If the meter DOES display battery voltage, test the
engine wiring harness. See
Testing Engine Wiring
Harness
in this section.
Testing the Battery
Battery Voltage Test
1. Verify that the correct battery for the engine and
application is installed. Consult the equipment owner's
manual for proper battery specification.
2. Obtain a digital multimeter.
3. Connect the RED test lead to the volt/ohm receptacle
of the meter and the BLACK test lead to the COM
receptacle of the meter.
4. Select DC VOLTS on the multimeter.
5. Attach the RED meter test lead probe to the POSITIVE
(+) battery terminal.
6. Attach the BLACK meter test lead probe to the
NEGATIVE (-) battery terminal.
7. Observe the multimeter display. Record results.
The multimeter display should display
12 volts
or
ABOVE on a good battery. If the battery voltage is
between 10-12 volts, fully charge the battery prior to
continuing with troubleshooting. If the battery voltage is
less than 10 volts, replace the battery prior to continuing
troubleshooting.
NOTE:
If testing battery voltage on a gaseous-fueled
standby generator engine, the observed battery voltage
must read
13 volts
or higher. Standby home generators
are equipped with a battery charge maintenance
circuit, or "trickle-charger" that maintains battery
voltage. If battery voltage of LESS THAN 13 volts is
observed, check the battery maintenance charger
circuit. See
Air-Cooled Standby Generator Electrical
Troubleshooting and Repair Manual
for troubleshooting
and testing procedures.
8. Proceed to Battery Load Test.
Battery Load Test
To perform a battery load test WITHOUT the use of a battery
load test tool, proceed as follows. If using a battery load test
tool, see tool instructions for proper testing procedures.
1. Obtain a digital multimeter.
2. Connect the RED test lead to the volt/ohm receptacle
of the meter and the BLACK test lead to the COM
receptacle of the meter.
3. Select DC VOLTS on the multimeter.
39
Summary of Contents for BIG BLOCK M540000
Page 46: ...Special Tools Image Chart 30 47...
Page 74: ...84 75...
Page 75: ...85 76 vanguardpower com...
Page 81: ...94 82 vanguardpower com...
Page 111: ...Vanguard Model 540000 145 112 vanguardpower com...
Page 113: ...Vanguard Model 610000 146 114 vanguardpower com...
Page 136: ...176 137...
