Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 19Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 19

MAINTENANCE
Spark Plug Inspection
Inspect spark plugs at the recommended intervals1Remove the spark plug leads by twisting the rubber boots slightly and pull off
IMPORTANT: Use resistive spark plugs only
2Remove the spark plugs to inspect and clean Replace spark plug if electrode is worn or the insulator is roughcracked, broken, blistered or fouled3Set the spark plug gapSee Specification Chart
4Before reinstalling spark plugs, clean away dirt on the spark plug seatsInstall plugs finger tight, and tighten 14 turn or torque to 20 Ib-n (27 Nm)

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