AIR INTAKE SYSTEMS
19
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.
Figure 3.1
Remove these
screws
4. Pull off the choke and throttle knobs. See Figure
3.2.
5. Disconnect the wire from the ignition switch and
the primer line from the primer button.
6. Remove the two screws that fasten the upper
heatbox housing to the lower housing and lift out
the upper housing.
See Figure 3.3.
NOTE: Write down or take a picture of how the
prime line and ignition wires are routed through
the upper heat box housing.
Figure 3.2
Pull off the throttle
and choke knobs
Fi
ure 3.3
Remove these
screws
CHAPTER 3: AIR INTAKE SYSTEMS
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For Discount White Outdoor Parts Call 606-678-9623 or 606-561-4983
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