Fuel System; Air Filter - Stihl 029, 039 Service Manual

STIHL 029, 039
11.

FUEL SYSTEM

11.1

Air Filter

Master Control in
"CHOKE" position
The air filter's function is to remove any
dust and dirt sucked in with the
combustion air and thus help reduce
wear on engine components to a
minimum.
Dirty and clogged air filters reduce
engine power, increase fuel con-
sumption and make starting more
difficult.
The air filter should always be
cleaned when engine power begins
to drop off.
Before removing the filter, close the
choke shutter to prevent dirt falling
into the carburetor - press down the
interlock lever and move Master
Control down to cold start position
(CHOKE).
- Turn twist lock on carburetor box
cover one quarter turn counter-
clockwise and take away the cover.
Top:
Twist lock on carburetor box cover
Bottom:
1 = Prefilter
2 = Slotted nuts
- Clean away any loose dirt from
around the filter.
- Push the prefilter up a little or take
it out of the recesses in the handle
housing.
- Unscrew the slotted nuts.
Separating two halves of air filter
- Pull the air filter off the studs.
- Separate the two halves of the
filter.
- Wash both parts of the filter in a
fresh, non-flammable cleaning
solution (e.g. warm soapy water)
and, if possible, blow clear with
compressed air. Encrusted dirt
should be softened by immersing
the filter in the cleaning solution.
Important: Do not clean flocked air
filters with compressed air, brushes
or rags.
Note: If the filter is damaged,
replace it immediately.
Installation is a reversal of the
removal sequence.
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