Craftsman 247.88955 - Manual (Page 17)

17
SERVICE AND MAINTENANCE
Checking spark Plug
NOTE: Check the spark plug once a season or every 25 hours of
operation. Change the spark plug once a season or every 100 hours.
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
Remove the spark plug boot and use a spark plug wrench to 1.
remove the plug. See Figure 14.
Visually inspect the spark plug. Discard the spark plug if there is
2.
apparent wear, or if the insulator is cracked or chipped. Clean the
spark plug with a wire brush if it is to be reused.
Measure the plug gap with a feeler gauge. Correct as necessary
3.
by bending side electrode. See Figure 15. The gap should be set
to .02-.03 inches (0.60-0.80 mm).
Check that the spark plug washer is in good condition and thread
4.
the spark plug in by hand to prevent cross-threading.
After the spark plug is seated, tighten with a spark plug wrench to
5.
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.
LUbriCation
gear shaft
The gear (hex) shaft should be lubricated at least once a season or
after every 25 hours of operation.
To prevent spillage, remove all fuel from tank by running engine 1.
until it stops.
Carefully pivot the snow thrower up and forward so that it rests on
2.
the auger housing.
Remove the lower frame cover from the underside of the snow
3.
thrower by removing the four self-tapping screws which secure it.
Apply a light coating of engine oil (or 3-in-1 oil) to the hex shaft.
4.
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.
Figure 15
.02-.03 in.
(0.60-0.80 mm)
Electrode
Warning
DO NOT check for spark with spark plug removed. DO NOT crank
engine with spark plug removed.
Warning
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
Figure 14
Figure 16
Spark Plug
Spark Plug Boot
CaUtion
The spark plug must be tightened securely. A loose spark plug can
become very hot and can damage the engine.