Briggs & Stratton 86262GS, Familiarization & Troubleshooting Manual

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The V-Twin engine’s low oil pressure circuit is shown
schematically in Figure 2.78.
During initial cranking, the relay contacts are open but close
after the relay heater coil warms up.The low oil pressure
switch will be opened when engine oil pressure reaches
approximately 10 psi (0.32 kg per cm2).
Should oil pressure drop after startup, the oil pressure
switch contacts will close. On contact closure, the ignition
circuit will be grounded and shutdown will occur.
Oil Pressure Switch On “GN” Engines
The “XL” and “MC” series generators use an oil pressure
switch and a warning light similar to the ones used on the V-
Twin engine (Figure 2.79).
However, the functions of the time delay relay are built into
a system control circuit board (Figure 2.80).
The low oil pressure system will shut down the engine
automatically when oil pressure drops below approximately
10 psi (0.32 kg per cm2).
The system control circuit board provides a time delay that
allows oil pressure to build during initial cranking.The delay
permits the engine to run for about 10 seconds before oil
pressure is sensed.
During operation, a low oil pressure condition will result in
engine shutdown.The low oil light will then come on and
remain on while the engine is rotating. Once engine rotation
has terminated, the light will go out. Any attempt to restart
the engine within five seconds will not work.The system
requires five to ten seconds to reset. If you restart the
engine after a low oil pressure shutdown and have not
corrected the low oil pressure condition, the engine will run
for about ten seconds and then shut down.
49
Section 2 • Generator Components & Systems
Portable Generator Familiarization & Troubleshooting Guide
Figure 2.78 — V-Twin Time Delay Relay Schematic
Figure 2.77 — V-Twin Engine’s Time Delay Relay
Figure 2.80 — “XL” Oil Pressure Switch Schematic
Figure 2.79 — “XL” Series Oil Pressure Switch