Chapter 3: Air Intake and filter
23
Air filters
The main function of the air filter is to trap air borne
particles before they reach the carburetor that can
cause catastrophic internal engine damage.
MTD vertical shaft engines use two different air filters.
The first is a rectangular paper pleated filter with a
foam pre-filter. The second is an oval foam filter.
See Figure 3.1.
• Air filters used on the MTD engine are designed
to prevent particles larger than 3-5 micron from
passing through into the engine.
• The filter should be checked on a regular basis
possibly several times in a season.
NOTE: Never use compressed air on a paper air
filter. Compressed air will remove the tiny fibers
that are used to catch the dirt in the air. Without
these fibers the filter is useless.
NOTE: Refer to Chapter 1: Introduction for the
maintenance interval and cleaning instructions
for the air filter.
Figure 3.1
Paper-Pleated
Element
Foam Pre-Filter
Foam filter
Paper air filter
1. To access the air filter, remove the thumb screw
that holds the air filter cover closed.
2. Swing open the filter cover. See Figure 3.2.
3. Remove the air filter and the pre-cleaner.
4. Install the filters by following the above steps in
reverse order.
Air filter housing
To remove the air filter housing:
1. Remove the air filter by following the steps
described above.
Figure 3.2
CHAPTER 3: AIR INTAKE AND FILTER
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