Mercury 40 Jet - Page 83

MAINTENANCE
75
1. Remove the spark plug boots. Twist the rubber boots slightly
and pull off.
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2. Remove the spark plugs to inspect. Replace spark plug if
electrode is worn or the insulator is rough, cracked, broken,
blistered, or fouled.
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3. Set the spark plug gap to specification.
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Spark Plug
Spark plug gap 1.0 mm (0.040 in.)
4. Before installing spark plugs, clean off any dirt on the spark
plug seats. Install plugs finger‑tight, and then tighten 1/4 turn
or torque to specifications.
Description Nm lb. in. lb. ft.
Spark plug 27 20