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.
2. Remove the spark plugs for inspection. Replace the spark plug if the electrode is worn or the insulator is rough, cracked,
broken, blistered, or fouled.
3. Set the spark plug gap to specification.
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 the spark plugs finger‑tight and then
tighten to the specified torque.
Description Nm lb‑in. lb‑ft
Spark plug 18.0 159.3 –
Timing Belt Inspection
Inspect the timing belt. Replace the belt if any of the following conditions are found:
•
Cracks in the back of the belt or in the base of the belt teeth
• Excessive wear at the roots of the cogs
• Rubber portion swollen by oil
• Belt surfaces roughened
Maintenance
Page 1B-8 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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