Manually operated systems require resetting by pushing
the reset button until it latches. After the engine starts
and develops oil pressure, the oil pressure will push the
reset button to the extended running position.
If the reset button does not move to the extended
position after the engine starts, the engine will not
be protected by this switch.
If the button remains in the reset position, the engine
oil pump is not developing normal oil pres sure and
a check should be made.
Automatic start-stop systems use a pressure switch
which resets itself.
Electronic Overspeed Shutoff Switch
This switch uses a magnetic pickup mounted in the
flywheel housing to sense engine speed.