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18 Generac
®
Power Systems, Inc.
4.3 CHANGING THE ENGINE OIL
4.3.1 ENGINE OIL RECOMMENDATIONS
Use oil of American Petroleum Institute (API) Service
Class SG, SH or SJ. Use all season SAE 5W-30
Synthetic oil. Organic break-in oil is required before
using synthetic oil.
NOTE:
The unit is supplied with “break-in” oil. See the
“Break-in Procedure,” Section 3.1, for the first
required oil change.
Any attempt to crank or start the engine before
it has been properly serviced with the recom-
mended oil may result in an engine failure.
4.3.2 OIL CHANGE PROCEDURE
To change the oil, proceed as follows:
1. Run the engine until it is thoroughly warmed up
then shut OFF the engine.
2. Immediately after the engine shuts OFF, pull the
oil drain hose (Figure 4.4) free of its retaining
clip. Remove the cap from the hose and drain the
oil into a suitable container.
3. After the oil has drained, replace the cap onto the
end of the oil drain hose. Retain the hose in the clip.
4. Refill with the proper recommended oil (see
Section 4.3.1). See Section 1.5.2 for oil capaci-
ties.
Figure 4.4 – Oil Drain Hose and Filter
4.4 CHANGING THE OIL FILTER
Change the engine oil filter as follows:
1. With the oil drained, remove the old oil filter by
turning it counterclockwise.
2. Apply a light coating of clean engine oil to the gas-
ket of the new filter. See Section 1.5.1 for recom-
mended filter.
3. Screw the new filter on by hand until its gasket
lightly contacts the oil filter adapter. Then, tight-
en the filter an additional 3/4 to one turn (Figure
4.4).
4. Refill with the proper recommended oil (see
Section 4.3.1). See Section 1.5.2 for oil capaci-
ties.
5. Start the engine and check for leaks.
4.5 CHANGING THE ENGINE
AIR CLEANER
4.5.1 7 KW, 12 KW AND 15 KW
GENERATORS
See Figures 1.1 and 1.2, for the location of the air
cleaner. Use the following procedure (Figure 4.6):
1. Turn the two screws counterclockwise to loosen.
2. Remove the cover and air filter.
3. Wipe away dust or debris from inside of the air
box and around edges.
4. Install the new air cleaner into the air box.
5. Install the cover. Turn the two cover screws clock-
wise to tighten.
See the “Service Schedule,” Section 4.13, for air
cleaner maintenance. See Section 1.5.1 for air filter
replacement part number.
Figure 4.6 — 7 kW, Engine Air Cleaner Location
Air Cleaner
Fuel
Regulator
Oil Filter
Oil
Drain
Hose
Low Oil Switch
High Temp Switch
L
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o
s
e
n
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Section 4 — Maintenance
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators