Spark Plug Inspection; Battery Inspection - Mercury 300 - PRO MAX 3.0L User Manual

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Spark Plug Inspection

Inspect spark plugs at the recommended intervals.
1
Remove the spark plug leads by twisting the rubber boots slight-
ly 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, bro-
ken, blistered, or fouled.
3
Set the spark plug gap. See Specification Chart in General In-
formation Section.
4
Before reinstalling spark plugs, clean away dirt on the spark plug
seats. Install plugs finger tight, and tighten 1/4 turn or torque to
20 lb. ft. (27 N·m).

Battery Inspection

The battery should be periodically inspected.
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.
4. Battery cable terminals should be clean, tight, and positive to
positive and negative to negative.
5. Make sure the battery is equipped with nonconductive terminal
shields to prevent accidental shorting of battery terminals.
MAINTENANCE
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