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Mercury 10 EFI FourStroke - Gearcase Lubricant

Mercury 10 EFI FourStroke
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Spark Plug Inspection and Replacement
!
WARNING
Damaged spark plug boots may emit sparks that can ignite fuel vapors under
the engine cowl, resulting in serious injury or death from a fire or explosion.
To avoid damaging the spark plug boots, do not use any sharp object or
metal tool to remove the spark plug boots.
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 the 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 0.9 mm (0.035 in.)
4. Before installing the spark plugs, clean off any dirt on the spark plug
seats. Install plugs finger‑tight and then tighten 1/4 turn, or tighten to the
specified torque.
Description
Nm lb‑in. lb‑ft
Spark plug 20 177
MAINTENANCE
86 eng

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