Craftsman 247.88970 Operator's Manual page 18

3. Measure the plug gap with a feeler gauge. Correct as necessary
by bending side electrode. See Figure 15. The gap should be set
to .02-.03 inches (0.60-0.80 mm).
4. Check that the spark plug washer is in good condition and thread
the spark plug in by hand to prevent cross-threading.
5. 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.
CaUtion
The spark plug must be tightened securely. A loose spark plug can
become very hot and can damage the engine.
LUbriCation
gear shaft
The gear (hex) shaft should be lubricated at least once a season or
after every 25 hours of operation.
1. To prevent spillage, remove all fuel from tank by running engine
until it stops.
2. Carefully pivot the snow thrower up and forward so that it rests on
the auger housing.
3. Remove the lower frame cover from the underside of the snow
thrower by removing the four self-tapping screws which secure it.
4. Apply a light coating of engine oil (or 3-in-1 oil) to the hex shaft.
See Figure 16.
NOTE: When lubricating the hex shaft, be careful not to get any oil on
the aluminum drive plate or rubber friction wheel. Doing so will hinder
the snow thrower's drive system. Wipe off any excess or spilled oil.
Wheels
At least once a season, remove both wheels. Clean and coat the axles
with a multipurpose automotive grease before reinstalling wheels.
auger shaft
At least once a season, remove the shear pins on auger shaft. Spray
lubricant inside shaft, and around the spacers and flange bearings
found at either end of the shaft. See Figure 17.
SERVICE AND MAINTENANCE
Electrode
.02-.03 in.
(0.60-0.80 mm)
18
Figure 15
Figure 16
Figure 17