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EngineMaintenance
CheckEngine0il
• Remove oilfilldipstick.
• Check oillevel on dipstick. Level should be at
FULL mark.
• Replace dipstickand tighten.
ChangingEngine0il
• Only use high qualitydetergent oilrated withAPI
service classificationSF, SG, or SH. Select the
oil's SAE viscositygrade according tothe
expected operating temperature. Refer to
operation sectionfor viscositychart.
• Stop engine and wait several minutes before
checking oil level. Withengine on level ground,
the oil mustbe to FULL mark on dipstick.
• Change engine oilafter thefirst five hoursof
operation, and every 50 hoursthereafter. Change
oilevery 25 hours ofoperation ifthe engine is
operated under heavy load or in high ambient
temperatures.
To Drain0il
Drain oilwhile engine iswarm. Followthe instructions
given below.
• Remove oil drain plug and fill dipstick.Catch oil in
a suitable container.
• When engine is drained of all oil, replace drain
plug securely.
• Refill with fresh oil, using the recommended
grade.
• Replace dipstick.
ServiceAirCleaner
The air cleaner prevents damaging dirt, dust,etc.,
from enteringthe carburetor and being forced intothe
engine and isimportanttoengine life and
performance. The air cleaner consistsof a paper pre-
cleaner and a foam filtercartridge.
WARNING: Never run the engine without
an air cleaner completely assembled.
Replace paper pre-cleaner once a year or every
100 operating hours. Replace more frequently if
operating under dusty conditions. Replacement
filters are available at any Sears Service Center.
NOTE: Do not attempt to clean or oil the paper pre-
cleaner element.
• Service cartridge every 3 months or every 25
operating hours. Service cartridge more often
under dusty conditions.
To ServiceFoamCartridge
• Loosen air cleaner cover screws, but do not
remove screw from cover. Swing cover down to
remove from hinge.
• Inspect filter for discoloration or dirt
accumulation. If either is present, proceed as
follows:
• Clean inside of body and cover thoroughly.
• Remove foam cartridge and wash in liquid
detergent and water. Squeeze dry in a clean
cloth and saturate in engine oil. Squeeze (don't
twist) in a clean absorbent cloth to remove all
excess oil.
• Reassemble foam cartridge and paper pre-
cleaner in the body. Swing cover down and
tighten the two screws loosened earlier.
WARNING: Temperature of muffler and
nearby areas may exceed 150° F(65°C).
Avoid these areas.
ServiceSparkPlug
• Clean the spark plug and reset the gap to .030" at
least once a season or every 50 hoursof
operation. See Figure9.
• Clean area aroundspark plug. Remove and
inspectspark plug.
• Replace ifelectrodes are pitted, burned or the
porcelain iscracked.
• Check electrode gap with wire feeler gauge and
reset gap to .030 inches.
NOTE: Do not sandblast spark plug. Spark plug
should be cleaned by scraping or wire brushing and
washing with a commercial solvent.
.030" Feeler Gau
Figure 9
CleanEngine
• Clean engine periodically, by removing dirt and
debris with a cloth or brush.
NOTE: Cleanig with a forceful spray of water is not
recommended as water could contaminate the fuel
system.
• To ensure smooth operation of the engine, keep
the governor linkage, springs, and controls free
of debris.
• Every 100 hours of operation, remove
combustion deposits from top of cylinder, cylinder
head, top of piston, and around valves.
11
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