MAINTENANCE
90
Spark Plug
Spark plug gap 1.0 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 1/4 turn
or torque to specifications.
Description Nm lb. in. lb. ft.
Spark plug 27 20
Lubrication Points
It is important to inspect and maintain your outboard motor
regularly. Maintenance intervals should be determined according
to the number of hours or number of months, whichever comes
first. For periodic servicing and maintenance guidelines, please
contact your local Mercury dealer.
Item
Every 50 hours or 3
months
Every 100 hours or 6
months
Action
Sliding and
rotating parts
Yes Yes
Apply and pump in
grease
Grease fittings Yes Yes
Apply and pump in
grease
Gearcase Lubrication
When adding or changing gearcase lubricant, visually check for
the presence of water in the lubricant. If water is present, it may
have settled to the bottom and will drain out prior to the lubricant,
or it may be mixed with the lubricant, giving it a milky colored
appearance. If water is noticed, have the gearcase checked by
your dealer. Water in the lubricant may result in premature bearing
failure or, in freezing temperatures, will turn to ice and damage the
gearcase.
Remove the fill/drain plug and examine the magnetic end for metal
particles. A small amount of metal filings or fine metal particles
indicates normal gear wear. An excessive amount of metal filings
or larger particles (chips) may indicate abnormal gear wear and
should be checked by an authorized dealer.
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