Craftsman 31AS2S5D799 Operator's Manual page 15

5. Measure the plug gap with a feeler gauge. Correct as necessary by bending
the side electrode, see Figure 16. The gap should be set to .02-.03 inches
(0.60-0.80 mm).
Electrode
.02-.03 in.
(0.60-0.80 mm)
6. Check that the spark plug washer is in good condition and thread the spark
plug in by hand to prevent cross-threading.
7. After the spark plug is seated, tighten with a spark plug wrench to compress
the washer.
NOTE: When installing a new spark plug, tighten 1⁄2-turn after the spark
plug seats to compress the washer. When reinstalling a used spark plug,
tighten 1⁄8- to 1⁄4-turn after the spark plug seats to compress the washer.
The spark plug must be tightened securely. A loose spark plug can become
very hot and can damage the engine.
Cleaning the Engine
If the engine has been running, allow it to cool for at least half an hour before
cleaning. Periodically remove dirt build-up from engine. Before servicing the
engine, remove the carburetor cover and/or blower housing. Discard the dirt and
debris from the following areas:
Do not spray the engine with water to clean it because the water could
contaminate the fuel. Using a garden hose or pressure washing equipment
can also force water into the muffler opening. Water that passes through
the muffler can enter the cylinder and cause damage.
• Cooling Fins
• Air Intake Screen or Recoil Starter/Flywheel Guard Areas
• Spark Plug Connection
• Levers
• Linkage Area
• Guards
• Carburetor
• Engine Head
SERVICE AND MAINTENANCE
Figure 16
CAUTION
CAUTION
Removing debris will insure adequate cooling, correct engine speed and reduce the
risk of fire.
Accumulation of debris around the muffler could cause a fire. Inspect and
clean before every use.
Lubrication
Lubricate the pivot points on the control handle and the extension spring at the end
of the control cable with a light oil once every season and before the snow thrower
is put into storage at the end of the season.
Adjustments
Shave Plate
To check the adjustment of the shave plate, place the machine on a level surface.
The wheels, shave plate and auger paddles should all contact the level surface.
Note that if the shave plate is adjusted too high, snow may blow under the auger
housing. If the shave plate wears out excessively, or the snow thrower does not
self-propel, the shave plate may be too low and needs to be adjusted.
NOTE: On new snow throwers or machines with a new shave plate installed,
the auger paddles may be slightly off the ground.
To adjust the shave plate proceed as follows:
1. Run the snow thrower until the fuel tank is empty.
2. Pull the starter cord until resistance is felt. Then tip the snow thrower back
until it rests on the handles. To ensure that the snow thrower does not tip
forward, it may be necessary to secure the handle to the ground with a block
or other object.
3. Loosen the four flange lock nuts and carriage bolts which secure the shave
plate to the housing. See Figure 17. Move the shave plate to the desired position
and retighten the nuts and bolts securely.
Reversible Shave Plate
4. Tip the snow thrower back to the operating position and pull the starter
handle a few times to see if it is difficult to pull.
15
WARNING
Side View
Screw
Lock Nut
Figure 17