4-4
CHANGING ENGINE OIL AND FILTER
WARNING
Accidental or remote starting can
cause severe personal injury or death. Discon-
nect the negative (–) cable at the battery to pre-
vent the engine from starting.
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.
WARNING
Crankcase pressure can blow hot
engine oil out the fill opening causing severe
burns. Always stop the genset before removing
the oil fill plug.
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.
2. Remove the oil fill plug (Figure 4-1), open the
front access door and drain the engine oil into
a container by opening the drain valve (Fig-
ure 4-2). (The drain valve has a 3/8 NPT outlet
for connecting a hose fitting to facilitate oil
draining.) If an oil pump-out system is installed,
follow the instructions provided.
3.
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 filter gasket and partly
fill the filter with oil so that it reaches engine
parts sooner at startup. Spin the new filter on by
hand until the gasket just touches the mounting
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 12). Check the oil level and add or
drain oil as necessary.
CAUTION
Too little oil can cause severe
engine damage. Too much oil can cause
high oil consumption.
7. Close the access door and dispose of the used
oil and oil filter according to local environmental
regulations.
OIL DRAIN
VALVE
OIL
FILTER
FIGURE 4-2. OIL FILTER AND DRAIN VALVE
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Summary of Contents for MDKBH Series
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