4-3
CHECKING ENGINE OIL LEVEL
WARNING
State and federal agencies have de-
termined that contact with used engine oil can
cause cancer or reproductive toxicity. Avoid
skin contact and breathing of vapors. Use rub-
ber gloves and wash exposed skin.
CAUTION
Too little oil can cause severe en-
gine damage. Too much oil can cause high oil
consumption.
Shut off the genset and check the oil level with the
dip stick (Figure 4-1, 4-2 or 4-3). Add or drain oil as
necessary. Add 1 quart (0.9 liters) when the level
falls to the ADD mark. Drain oil if the level is above
the full mark.
See ENGINE OIL RECOMMENDATIONS (p. 3-1).
CHANGING ENGINE OIL AND FILTER
Refer to Table 4-1 for scheduled engine oil change.
1. Run the genset under load until it is up to oper-
ating temperature, stop it and disconnect the
negative (−) battery cable at the battery.
WARNING
Accidental or remote starting
can cause severe personal injury or death.
Disconnect the negative (−) cable at the bat-
tery to prevent the engine from starting.
2. Be ready to drain the oil into a suitable contain-
er and then open the drain valve or unscrew the
plug on the end of the drain hose (Figure 4-1,
4-2 or 4-3) and drain the oil into a suitable con-
tainer. (Two wrenches are necessary to keep
from twisting the hose when loosening and
tightening the plug.) If an oil pump-out system
is installed, follow the instructions provided.
3. Secure the drain plug or close the oil drain
valve.
4. Spin off the old oil filter with a filter wrench and
wipe off the filter mounting surface. (A filter
wrench is available from Onan.) Remove the
old gasket if it does not come off with the filter.
5. Apply a film of oil to the new filter gasket and
partly fill the new filter with oil so that it reaches
engine parts sooner at startup. Spin the filter on
by hand until the gasket just touches the mount-
ing pad and tighten 3/4 turn.
6. Refill the engine with the proper type and
amount of engine oil. See ENGINE OIL REC-
OMMENDATIONS (p. 3-1) and Specifications
(Section 10). Check the oil level and add or
drain oil as necessary. Run the engine for a few
minutes, shut it down and recheck for proper oil
level.
7. Dispose of the used oil and oil filter according
to local environmental regulations.
Redistribution or publication of this document,
by any means, is strictly prohibited.
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