Chapter 1: INTRODUCTION
4
Air filters
Generally air filters come in two different types, a
pleated-paper element, or a foam plastic, sometimes a
combination of the two will be used like the one on the
MTD engine. See Figure 1.2.
1. The main function of the air filter is to trap air
borne particles before they enter the engine. Dirt
ingestion can cause serious internal engine
damage.
NOTE: Snow engines do not have air filters
because the snow will plug up the filter. Gener
-
ally the air is clean enough that there is minimal
risk of dirt ingestion when the ground is covered
with snow.
2. Air filters used on the MTD engine are designed
to prevent particles larger than 5 microns from
passing through into the engine.
3. The filter should be checked on a regular basis;
possibly several times in a season.
4. Typically an air filter should be changed before
every season.
5. If a foam air pre-cleaner is dirty, but not in 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 catch the dirt in the air. Without these fibers
the filter is useless.
6. Foam pre-filters can be washed 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.
7. 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.
NOTE: Do not oil the foam pre-filter. The paper
filer will absorb the oil and it will become
plugged.
Figure 1.2
Paper-Pleated
Element
Foam Pre-Filter
Pre-filter and
filter together
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