Testing Oil Gard - Briggs & Stratton Twin Cylinder L-Head Repair Manual

The sensor acts as a current limiting device in series
with the 12 volt battery and warning device and/or stop
switch. The sensor screws into a boss in the sump
base and has a protective cap with metering holes that
regulate the amount of crankcase oil that contacts the
sensor. This prevents the warning device and/or, stop
switch from being accidentally activated due to sudden
changes of oil levels due to agitation or angle of
operation, Fig. 24.
NOTE: Engines equipped with Oil Gard use
only one dipper; attached to #1 connecting
rod.
NOTE: The warning device and all related wiring is
supplied by the equipment manufacturer.
Testing Oil Gard
Use Digital Multimeter, Tool #19390, or #19464. The
Digital Multimeter is available from your Briggs &
Stratton source of supply. The meter may be used to
read volts, ohms or amperes, Fig. 25.
Engine must be stopped and at room temperature
(60°F (15.5° C) or higher). Place equipment ignition
switch in off position.
1. Insert red test lead into receptacle in meter.
2. Insert black test lead into COM receptacle in
meter.
3. Rotate selector to position.
4. Disconnect sensor wire at connector.
5. Connect one meter lead to sensor wire and other
meter lead to ground, Fig. 26.
6. A meter reading of 50-80 ohms indicates that
sensor is good.
7. If meter reading is below 50 ohms, replace sensor.
8. If meter reading shows continuity, check for a
pinched and/or grounded sensor wire. Repair or
replace sensor wire as required.
9. If meter reading is over 80 ohms, check connec-
tions for dirt or corrosion. Clean and retest. If meter
reading is still over 80 ohms, replace sensor.
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KEY SWITCH
DEVICE OFF
SENSOR TIP
CONNECTOR
KEY SWITCH
SENSOR TIP
CONNECTOR
Fig. 24 – Typical Wiring Diagram
Fig. 25 – Digital Multimeter
Fig. 26 – Oil Gard Sensor Test
WARNING
12 VOLT
BATTERY
SUFFICIENT OIL IN
CRANKCASE
WARNING
DEVICE ON
12 VOLT
BATTERY
LOW OIL LEVEL
9