Spark Plug Inspection; Battery Inspection - Mercury 240 Jet Drive Manual

Spark Plug Inspection

Inspect spark plugs at the recommended intervals.
1. Remove the spark plug leads by twisting the rubber boots slightly and pull off. Inspect
spark plug boots and replace if cracked.
2. Remove the spark plugs to inspect and clean. Replace spark plug if electrode is worn
or the insulator is rough, cracked, broken, blistered or fouled.
3. Set the spark plug gap. See Specification Chart in General Information Section.
4. Before reinstalling spark plugs, clean away dirt on the spark plug seats. Install plugs fin-
ger tight, and tighten 1/4 turn or torque to 20 lb. ft. (27 Nm).

Battery Inspection

The battery should be inspected at periodic intervals to ensure proper engine starting capa-
bility.
IMPORTANT: Read the safety and maintenance instructions which accompany your
battery.
1. Turn off the engine before servicing the battery.
2. Add water as necessary to keep the battery full.
3. Make sure the battery is secure against movement.
4. Battery cable terminals should be clean, tight, and correctly installed. Positive to positive
and negative to negative.
5. Make sure the battery is equipped with a nonconductive shield to prevent accidental
shorting of battery terminals.
90-884822 DECEMBER 2001
MAINTENANCE
Page 1B-5