Chapter 1: INTRODUCTION
4
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 1.2.
5. Air filters used on the MTD engine are designed
to prevent particles larger than 3-5 micron from
passing through into the engine.
6. The filter should be checked on a regular basis
possibly several times in a season.
See Figure 1.3.
7. Typically an air filter should be changed, or
cleaned if it is a foam one, before every season.
8. If a foam air filter or pre-cleaner is dirty and not
in to bad of condition it can be cleaned and
reused. The paper pleated filters can be shaken
or lightly tapped to free the debris from the filter.
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.
9. Foam filters and pre-filters can be washer in
warm soapy water.
NOTE: When drying a foam filter either squeeze
it in side of a paper towel or let it air dry DO NOT
wring it because the filter will tear.
10. Before installing any foam filter, after it has been
washed, it needs to be free of moisture.
NOTE: Always check with factory specification
prior to servicing/replacing any engine compo-
nents.
Figure 1.2
Paper-Pleated
Element
Foam Pre-Filter
Foam
filter
Figure 1.3
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