Mercury 80 - Spark Plug Inspection and Replacement

MAINTENANCE
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9. Secure propeller nut by bending three of the tabs into the thrust hub grooves.
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10. Reinstall spark plug leads.
Spark Plug Inspection and Replacement
1. Remove top cowling. Refer to Top Cowl Removal and Installation.
2. Disconnect the wiring harness connectors from the pencil coils.
3. Remove the mounting bolts that are securing the pencil coils. Pull the pencil coils from the spark plugs
using a twisting motion.
a
b
d
c
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a - Wiring harness connector
b - Pencil coil
c - Bolt
d - Ground strap
4. Remove the spark plugs to inspect. Replace spark plug if electrode is worn, threads of seal area are
corroded, or the insulator is rough, cracked, broken, blistered or fouled.
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5. Set the spark plug gap to specifications.