AIR INTAKE SYSTEM
21
Heat box
One of the big differences between snow engines
and all other small engines is that the air intake of the
snow engine does not have an air filter. This is because
air filters tend to freeze, cutting off air flow to the
engine. The snow engine however does have a heat
box to preheat the intake air.
The bottom of the heat box is open to draw in a
large volume of cold air. The top of the heat box has a
small opening were the choke rod connects to the car
-
buretor. This draws in just enough warm air from the
top of the engine to heat the cold air to the desired tem
-
perature as it enters the carburetor.
To remove/replace the heat box:
1. Pull off the choke and throttle knobs.
2. Remove the engine shroud by taking off the five
screws secures it using a 10 mm wrench.
See Figure 3.1.
Figure 3.1
Remove these
screws
3. Disconnect the wire from the ignition switch and
the primer line from the primer button.
4. Slide the breather hose out of the heat box.
See Figure 3.2.
5. Remove the two carburetor nuts using a 10 mm
wrench.
See Figure 3.2.
NOTE: When installing, tighten the carburetor
nuts to a torque of 80 - 106 in-lbs. (9-12 Nm)
6. Remove the choke selector assembly.
7. Slide the heat box off of the carburetor studs.
8. Install the heat box by following the previous
steps in reverse order.
NOTE: There is no gasket between the heat box
and the carburetor.
Figure 3.2
Remove the
breather hose
Remove these
nuts
CHAPTER 3: AIR INTAKE SYSTEM
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