Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting
Page 16
If meter “Beeps” once, diode is OK.
If meter makes a continuous tone, diode is defective
(shorted). Replace ground harness.
If meter displays “OL,” diode is defective (open). Replace
ground harness.
6. Now, repeat test for #1 cylinder. Results must be
the same.
Fig. 16
CHECK CARBURETION
Before making a carburetion check, be sure the fuel tank
has an ample supply of fresh, clean gasoline. Be sure
that the shutoff valve, if equipped, is open and fuel flows
freely through the fuel line before starting engine.
If fuel fails to flow or is slow check for plugged fuel cap
vent, fuel line restriction or plugged fuel filter.
Make sure throttle and choke controls are properly
adjusted.
If engine cranks but will not start, remove and inspect the
spark plugs.
If plugs are wet, look for:
1. Over choking
2. Excessively rich fuel mixture
3. Water in fuel
4. Float needle valve stuck open
5. Plugged air cleaner
6. Fouled spark plugs
If plugs are dry, look for:
1. Leaking carburetor or intake manifold mounting
gaskets
2. Gummy or dirty carburetor, fuel filter, fuel lines or
fuel tank
3. Float needle valve stuck shut
4. Inoperative fuel pump
5. Inoperative fuel shut off solenoid
A simple check to determine if the fuel is getting to the
combustion chamber through the carburetor is to remove
either spark plug and pour a small quantity of gasoline
through the spark plug hole. Replace the plug. If the
engine fires a few times and then stops, look for the
same conditions as for a dry plug.
FUEL SHUT-OFF SOLENOID
The fuel shut off solenoid is controlled by the equipment
ignition switch. When the equipment switch is in the
OFF
position, the solenoid valve plunger closes, stopping fuel
flow through the fixed main and idle jets. When the
switch is in the
ON and START position, the solenoid
valve opens, allowing normal fuel flow. The solenoid is
operating properly if a click is heard when equipment
ignition switch is turned
ON and OFF. If solenoid is not
working (defective solenoid or equipment wiring), the
engine will not start or run.
NOTE: Fuel shut off solenoid requires a
minimum of 9 volts DC to function.
Testing Solenoid
If solenoid does not click, the problem may be in
equipment wiring, engine wiring harness or solenoid. To
determine whether problem is with wiring or solenoid,
perform the following tests in the order shown.
Test Equipment
The digital multimeter,
Tool #19464 is required to test the
solenoid equipment wiring.
The following tests will be performed with the meter in
the (DC volts) position.
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