Sears 247.79963 - Manual (Page 14)

AIR CLEANER
The air cleaner prevents damaging dirt, dust, etc.,
from entering the carburetor and being forced into the
engine and is important to engine life and per­
formance.
Never run your engine without air cleanei com-
pieteiy assembied.
To Service Air Cleaner:
Service pre-cleaner after every 25 hours of uso, or at
least once a season. Replace filter every 100 hours of
use, or at least once a season. Service pre-cleaner and
filter more often under dusty conditions.
• Remove wing nut and cover. See figure 16.
• Remove paper element. Remove and chec< foam
filter if your unit has one. Clean the inside of base
and cover thoroughly.
• Clean foam filter as follows.
Wash in water and detergent solution, and s queeze
(do not twist) until all dirt is removed.
Rinse thoroughly in clear water.
Wrap in a clean cloth and squeeze (do net twist)
until completely dry, or allow to air dry.
Saturate with engine oil and squeeze (don t twist)
to distribute oil and remove excess oil.
• Replace foam filter making sure the screen side is
towards the paper element. Secure with wing nut.
• If necessary, replace paper filter (do not ath smpt to
clean).
CLEAN ENGINE
Clean engine periodically. Remove dirt and debris
with a cloth or brush. Cleaning with a forceful spray of
water is not recommended as water could contami­
nate the fuel system.
Yearly or every 25 hours of using, whichever occurs
first, remove the air intake screen and blower
housing, and clean the areas shown in figure 17 to
avoid overspeeding, overheating and engine damage.
Clean more often if necessary.
A WARNING: PERIODICALLY CLEAN MUF­
FLER AREA TO REMOVE ALL GRASS,
DIRT AND COMBUSTIBLE DEBRIS.
FIGURE 17.
SPARK PLUG
The spark plug should be cleaned and the gap reset
to .030" at least once a season or after every 50
hours of operation. See figure 18. Spark plug replace­
ment is recommended at the start of each season.
Replace spark plug if electrodes are pitted, burned,
fouled with deposits, or porcelain is cracked. Refer to
engine parts list for correct spark plug type.
NOTE: Do not sandblast spark plug. Spark plug
should be cleaned by scraping or wire brushing and
washing with a commercial solvent.
Base
Paper
Element
Foam Element
(If so Equipped)
Wing
Nut
Cover
FIGURE 16.
MUFFLER
Do not operate the chipper-vacuum without a muffler
or tamper with the exhaust system. Damaged mufflers
or spark arresters could create a fire hazard. Inspect
periodically, and replace if necessary. If your engine
is equipped with a spark arrester screen assembly,
remove after every 50 hours of using for cleaning and
inspection. Replace if damaged.
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