AIR INTAKE SYSTEMS
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MTD builds horizontal crank engines for snow blowers and chore performers. The differences between snow
engines and chore engines are the muffler and the air intake system. Therefore the air intake system for the snow
and chore engines will be discussed separately, as will the mufflers in a later chapter.
Snow engines
One of the big differences between the snow engine and the chore engine is that the air intake of the snow
engine does not have an air filter because air filters freeze and cut off air flow. The snow engine however does have
a heat box to preheat the intake air, which the chore engines do not have.
Heat box
To remove/replace the heat box:
1. Drain the fuel out of the fuel tank into an approved
safety fuel can.
2. Remove the muffler shroud by taking off the six
screws the hold the muffler shroud in place using a
10 mm wrench. See Figure 3.1.
3. Disconnect the breather hose from the valve cover.
4. Pull off the choke and throttle knobs. See Figure 3.2.
Remove these
screws
Figure 3.1
Figure 3.2
Pull off the throttle
and choke knobs
CHAPTER 3: AIR INTAKE SYSTEMS
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