Section 3.1- lubrication system familiarization, Engine lubrication circuit, Recommended oils – Generac 86640 User Manual
Page 48: Low oil pressure shutdown, Checking low oil pressure shutdown
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Section 3.1- LUBRICATION SYSTEM FAMILIARIZATION
Engine Lubrication Circuit
Figure 1, below, shows the engine lubrication circuit in
block diagram form and pictorially.
Recommended Oils
Use a high quality detergent oil classified "For Service
SC, SD, SE or SF". Detergent oils keep the engine cleaner
and reduce carbon deposits. Use oil having the viscosity
rating listed in the chart below, based on the ambient temper
ature range anticipated before the next oil change.
TEMPERATURE
OIL GRADE
Above 86' F.
32' to 85* F.
Below 32* F.
All Seasons
Use SAE 40 oil
Use SAE 30 oil
Use SAE 20W oil
UseSAE10W-30oll
Low Oil Pressure Shutdown
The engine is equipped with a low oil pressure switch,
which is exposed to oil pressure in the engine's main oil
gallery. The pressure switch contacts are normally-closed
(N.C.), but are held open by oil pressure during startup and
running conditions. Should oil pressure drop below approxi
mately 12-15 psi, the switch contacts will close and an auto
matic engine shutdown will occur.
Checking Low Oil Pressure Shutdown
To test the operation of low oil pressure shutdown, start
the engine. Let the engine run at no-load, i.e., with all electri
cal loads disconnected from the generator. Disconnect wire
from oil pressure switch terminal and hold the wire terminal
end against a clean frame ground on the engine. After a very
short delay, the engine should shut down.
Figure 1. Engine Lubrication Circuit
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Page 3.1-1