Sears Craftsman 247.370340 Operator's Manual page 15

Always stop engine, disconnect spark plug wire, and ground against engine
before performing any type of maintenance on your machine.
GENERAL RECOMMENDATIONS
• Always observe safety rules when performing any maintenance.
• The warranty on this lawn mower does not cover items that have been
subjected to operator abuse or negligence. To receive full value from
warranty, operator must maintain the equipment as
instructed here.
• Changing of engine-governed speed will void engine warranty.
• All adjustments should be checked at least once each season.
• Periodically check all fasteners and make sure these are tight.
ENGINE MAINTENANCE
Spark Plug
For good performance, the spark plug must be properly gapped and free of
deposits. Replace the spark plug annually.
1. Disconnect the cap from the spark plug, and remove any dirt from the spark
plug area.
2. Use the proper size spark plug wrench to remove the spark plug.
NOTE: Replace with a Champion RJ2YXLE spark plug.
3. Check the gap with a wire gauge. See Figure 15. Spark plug gap should be
0.020 in (0.51 mm). If necessary, reset the gap.
4. Install and tighten the spark plug to the recommended torque (180 lb-in [20
Nm]).
5. Attach the spark plug cap to the spark plug.
Air Cleaner
A dirty air cleaner will restrict air flow to the carburetor and cause poor engine
performance. Inspect the filter each time the engine is operated. You will need to
clean the filter more frequently if you operate the engine in very dusty areas.
Clean the air cleaner every 25 hours of operation or once a season. Replace the air
cleaner annually.
Never start or run the engine with the air cleaner assembly or the air filter
removed.
NOTE: Do not use pressurized air or solvents to clean the filter. Pressurized air can
damage the filter and solvents will dissolve the filter.
1. Loosen the fastener that holds the cover and tilt plastic housing cover on side
of engine down. See Figure 16.
2. Remove air filter from plastic housing cover.
3. To loosen debris, gently tap the filter on a hard surface. If the filter is
excessively dirty, replace with a new filter.
4. Insert cover's tabs into slots in bottom of base.
5. Tilt cover up into place and secure with fastener.
SERVICE AND MAINTENANCE
WARNING
WARNING
Electrode
0.020 in. (.51mm)
15
Figure 15
Figure 16