Onan 3.0 AJ Operator's Manual page 16

OIL LEVEL
Check the oil level daily or at least every eight
operating hours. Oil should just start to overflow from
fill hole when crankcase is full.
Check oil when set (or vehicle) is level.
OIL CHANGE
The oil drain valve is located on the side (near the
bottom) of the oil base. Change oil initially at 25
operating hours; change every 50 hours after that.
Extremely dusty conditions require more frequent oil
changes. See Figure 8.
Be sure to fill the crankcase with oil to the "FULL"
mark on the oil level indicator. Use oil with the API
(American Petroleum Institute) designation SE or
SE/CC. Oil should be labeled as having passed MS
Sequence Tests (also known as having passed
ASTMG-1V Sequence Tests). Refer to oil chart for
recommended viscosity and temperature. The
engine's oil capacity is 2 quarts.
1°C -30 -20 -10 6 10 20 30 40
TEMPERATURE RANGE YOU EXPECT BEFORE NEXT OIL CHANGE
Oil consumption may be higher with a multigrade oil
than a single-grade oil if both oils have comparable
viscosities at 210°F (99°C). Therefore, single grade
oils are generally more desirable unless anticipating a
wide range of temperatures. Use the proper grade oil
for the expected conditions. When adding oil between
FIGURE 8. OIL FILL AND DRAIN
changes, use the same brand as in the crankcase.
Various brands of oil might not be compatible when
mixed.
Use of the same grade and quality of oil as that used in
your recreational vehicle engine is acceptable as long
as unit is serviced regularly and oil meets re¬
quirements shown in chart.
WARNING I
check oil while the generator set is
whhhhhJ operating. Hot oil could cause bums by
blowing out of oil fill tube due to crankcase pressure.
FUEL FILTER
An inline fuel filter mounts on inlet side of fuel pump.
Replace at least every 100 hours or when poor
performance is suspected.
When removing or replacing fuel solenoid
)
. . .
. . . . .
1
always use wrench on hex
(A),
Figure 9. Do
not exert turning force on B because solenoid will be damaged
internally.
FIGURE 9. INLINE FUEL FILTER
FUEL SOLENOID
Evaporative control systems on late model motor
homes require a positive fuel shutoff valve to prevent
the generator set from flooding when not in use.
AIR CLEANER
Replace air cleaner every 100 hours (sooner in dusty
conditions). Element used is a dry type and requires
no oil. Some dirt can be removed by tapping element
against a flat surface.
AIR CLEANER
COVER ELEMENT
BASE PLATE
FIGURE 10. AIR CLEANER ELEMENT
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