Mercury OUTBOARD MOTOR - Spark Plug Inspection and Replacement; Timing Belt Inspection

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 Gap
Spark plug 0.90 mm (0.035 in.)
4. Before installing spark plugs, clean off any dirt on the spark plug seats. Install plugs finger tight, and then
tighten to the specified value.
Description Nm lb. in. lb. ft.
Spark plug 27 20
Timing Belt Inspection
Inspect the timing belt and have it replaced by an authorized dealer if any of the following conditions are found.
1. Cracks in the back of the belt or in the base of the belt teeth.
2. Excessive wear at the roots of the cogs.
3. Rubber portion swollen by oil.