Gearcase Lubrication; Draining Gearcase - Mercury FourStroke 2.5 Service Manual

Maintenance
4. Pull the propeller straight off the shaft. Retain the drive pin. If the propeller is seized to the shaft and cannot be removed,
have the propeller removed by an authorized dealer.
a
5. Insert the drive pin into the propeller shaft.
a
6. Slide the propeller onto the shaft, making sure the slot in the propeller engages with the drive pin.
7. Install the cotter pin through the hole in the propeller and bend the cotter pin ends.
19018

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 drain pan below outboard.
3. Remove vent plug and fill/drain plug and drain lubricant.
Page 1B-8
a - Drive pin
19022
a - Drive pin
19023
a
a - Cotter pin
90-8M0065421 NOVEMBER 2012