Gear Case Lubrication; 3-1/4 In. (83Mm) Diameter Gear Case - Mercury 40 Service Manual

Gear Case Lubrication

When adding or changing gear case 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 gear case 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 gear case.
Whenever you remove the fill/drain plug, examine the magnetic end for metal particles. A
small amount of metal filings or fine metal particles indicates normal gear wear. An exces-
sive amount of metal filings or larger particles (chips) may indicate abnormal gear wear and
should be checked by an authorized dealer.

3-1/4 In. (83mm) Diameter Gear Case

DRAINING GEAR CASE
1. Place outboard in a vertical operating position.
2. Place a drain pan below outboard.
3. Remove vent plug and fill/drain plug and drain lubricant.
a -
GEAR CASE LUBRICANT CAPACITY
Gear case lubricant capacity is approximately 14.9 fl oz (440 ml).
90-828631R3 MARCH 1999
Vent Plug and Fill/Drain Plug
MAINTENANCE
a
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