78/83/90 Series Horizontal Shaft Engines
30
Air filter (summer engines)
Generally air filters come in two different types, a
pleated-paper element or foam. A combination of the two
are
used on the MTD engine.
• 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 fil-
ter. 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 instruc
-
tions for the air filter.
To replace an air filter:
1. Wipe down the air filter housing to prevent any
debris from getting into the engine.
2. Unthread the two wing nuts in the air filter cover.
See Figure 3.4.
NOTE: The wing nuts are part of the filter housing
and do not come off.
3. Swing the housing away from the fuel tank.
See Figure 3.5.
4. Remove the air filter assembly.
Figure 3.3
Foam pre-filter
Paper-pleated element
Figure 3.4
Wings nuts
Figure 3.5
Air filter
housing
Air filter assembly
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