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Vanguard Single Cylinder Manual

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53
2
1. Oil level must be between the ADD and
FULL mark on dipstick.
2. Remove pressure switch or 1/8 in. NPTF
plug in oil filter adapter.
3. Install oil pressure gauge ([A] Fig. 50).
4. Start engine. Run for approximately 5
minutes.
5. Check oil pressure at 3000 RPM. Oil
Pressure should be 10~50 psi (0.7~3.5
Bar).
If Oil Pressure is Low, check for:
• Engine RPM Too Low
• Wrong Viscosity or Diluted Oil
• Low Oil Level
• Broken Pressure Relief Spring
• Missing Pressure Relief Plunger
• Worn Bearings
• Damaged or Worn Oil Pump
If Oil Pressure is High, check for:
• Wrong Viscosity Oil
• Plugged Oil Galleries
• Stuck Pressure Relief Plunger
OIL GARD® LOW-OIL
PROTECTION SYSTEMS
VANGUARD™ series engines are equipped with
Oil Gard® low oil protection systems designed to
prevent engine damage from running with
insufficient oil. This oil float system is mounted
inside the engine cylinder. Oil Gard® will shut
down a running engine and prevent it from
restarting if the oil level becomes too low.
When the oil drops below the minimum level, a
float pin contacts the sensor mounting bracket in
the cylinder. This completes a circuit from the
ignition coil, through the module, to the float
sensor and then to ground. This grounds the
ignition coil and prevents the spark plug from
firing. When a restart is attempted, a light in the
ON/OFF switch flashes to indicate LOW OIL.
The Oil Gard® protection system consists of:
• An oil float sensor located inside the
cylinder.
• An electronic module.
• An ON/OFF rocker switch.
• Connecting wires.
The system may have a module with four wires
(BLUE, BLACK, WHITE and RED) or two wires
(BLACK, BLACK).
Preliminary Low Oil Checks:
• Ensure the engine oil level is to the FULL
mark.
• Ensure the fuel delivery system is
functioning properly.
• Ensure that the engine is not being
operated at an excessive angle.
• Ensure that the wiring is not obviously
pinched or otherwise damaged.
Troubleshooting Oil Gard® 2-Wire Systems
Symptom: Engine starts, dies and will not
keep runn ing
Disconnect the BLUE or BLACK wire at ([A] Fig.
51) and start engine.
If the engine starts and dies:
• Replace the module ([E] Fig. 51) and
retest.
If the engine starts and continues to run:
• Reconnect the wire at .
If the engine dies:
• Check continuity in the wire between ([A
and B] Fig. 51).
If there is no continuity:
• Replace the wire.
If the wire has continuity:
• Replace the float sensor in the cylinder
.
Symptom: Engine will not start
• Disconnect wires at ([C and D] Fig. 51)
and attempt an engine start.
If the engine does not start:
• Check the ignition armature (G) for
grounds.
If the engine starts and runs:
• Reconnect the wire at (C).
If the engine does not stop:
• Reconnect the wire at (D).
If the engine dies:
… 54 …


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