Specifications

27
Low Oil Shutdown Switches
Check the LOS switch while it is in the engine. The
engine must be level, and the oil level at the full
mark. Place the speed control in the run position.
Remove the spark plug wire from the spark plug.
Install a gap type tester connected to the spark plug
wire and a good engine ground. Spin the engine
over using the electric or recoil starter. A bright blue
spark should be seen at the tester. If not, remove
the blower housing and disconnect the LOS lead
from the ignition module. Reinstall the blower hous-
ing and spin the engine over. If spark occurs now,
replace the LOS switch. If no spark is seen, replace
the ignition module (diag. 57).
57
58
59
Switches, Sensors, and Solenoids
Low Oil Shutdown Indicator Light
If equipped, the indicator light will flash if the oil level
is at or below the add mark when the engine is turned
over while attempting to start. Test by turning the
engine over with the oil level below the add mark. If
the indicator light does not flash, replace the indicator
light (diag. 58).
Low Oil Pressure Sensor
Test the sensor on a running engine using an
ohmmeter or continuity tester with one test lead
connected to the sensor terminal and the other to an
engine ground. An open circuit should be found with
the engine running and continuity should exist when
the engine is shut off. If continuity is found or the oil
pressure indicator is on at low engine R.P.M.'s,
remove the sensor and install a master oil pressure
gauge. The oil pressure of a running engine should
be 7 p.s.i. (.500 bar) or higher, if lower an internal
engine problem exists (diag. 59).
OIL SHUTDOWN SWITCH
TO IGNITION
TO LOW OIL
SENSOR
GREEN
IDENTIFICATION
MARK