Gear Case Lubrication; Gear Case Lubricant Capacity; Draining Gear Case - Mercury 5 SERIES Service Manual

Gear Case Lubrication

Gear Case Lubricant Capacity

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.
Also examine the gear case lubricant 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 Gear Case

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 -
90-857138R1 MAY 2000
Gear Case Ratio
2.15:1
Fill/Drain Plug
Vent Plug
Capacity
6.6 fl oz. (195 mL)
b
a
MAINTENANCE
Page 1B-9