Gearcase Lubrication - Mercury 2.5 FourStroke Operation, Maintenance & Installation Manual

Remove the oil fill cap and refill with 300 ml (10 fl oz) of oil. Install the oil fill
cap.
Idle engine for five minutes and check for leaks. Stop engine and check oil
level. Add oil if necessary.

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.
Examine the drained gearcase lubricant for metal particles. A small amount of
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 the outboard in a vertical operating position.
2. Place the drain pan below outboard.
3. Remove the vent plug and fill/drain plug and drain lubricant.
NOTE: Replace the sealing washers with new washers.
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 180 ml (6.0 fl oz).
CHECKING LUBRICANT LEVEL AND REFILLING GEARCASE
1. Place the outboard in a vertical operating position.
2. Remove the vent plug.
MAINTENANCE
a - Vent plug
b - Fill/drain plug
a
b
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