Mercury Jet 40 - Spark Plug Inspection and Replacement; Steering Pull Adjustment

MAINTENANCE
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Spark Plug Inspection and Replacement
!
WARNING
Avoid serious injury or death from fire or explosion caused by damaged spark plug boots. Damaged spark plug
boots can emit sparks. Sparks can ignite fuel vapors under the engine cowl. To avoid damaging spark plug
boots, do not use any sharp object or metal tool such as pliers, screwdriver, etc. to remove spark plug boots.
1. Remove the spark plug leads. 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 specifications.
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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
Steering Pull Adjustment
The steering on some boats will have the tendency to pull towards starboard. This pulling condition can be corrected
by using a pliers and bending the ends of the exhaust fins 1.5 mm (1/16 in.) toward the starboard side of the
outboard.