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Mercury 8 User Manual

Mercury 8
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MAINTENANCE
92
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 lubricant draining from
the gearcase 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.
DRAINING GEARCASE
1. Place outboard in a vertical operating position.
2. Place drain pan below outboard.
3. Remove fill/drain plug and vent plug and drain lubricant.
a
b
28652
a - Vent plug b - Fill/drain plug
GEARCASE LUBRICANT CAPACITY
Standard model gearcase: Approximately 320 ml (10.8 fl. oz.).
Bigfoot model gearcase: Approximately 370 ml (12.5 fl. oz.).

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Mercury 8 Specifications

General IconGeneral
Full Throttle RPM5000-6000 RPM
Cylinders2
Gear Ratio2.08:1
Horsepower8 HP
StartingManual
Shaft Length15 in, 20 in
Fuel Tank CapacityExternal

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