Mercury 90 User Manual

MAINTENANCE
52
a
b
ob00439
a - Drain pan
b - Vent plugs
c - Fill/drain plug
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 710 ml (24 fl. oz.).
GEARCASE LUBRICANT RECOMMENDATION
Mercury or Quicksilver Premium or High Performance Gear Lubricant.
CHECKING LUBRICANT LEVEL AND FILLING GEARCASE
1. Place outboard in a vertical operating position.
2. Remove the front vent plug and rear vent plug.
3. Remove drain plug. Place lubricant tube into the drain plug hole and add lubricant until it appears at the front
vent hole. At this time install the front vent plug and sealing washer.
4. Continue adding lubricant until it appears at the rear vent hole.
5. Stop adding lubricant. Install the rear vent plug and sealing washer before removing lubricant tube.
6. Remove lubricant tube and reinstall cleaned fill/drain plug and sealing washer.
a
d
ob00442
e
c
b
a - Front vent plug
b - Front vent hole
c - Rear vent hole
d - Rear vent plug
e - Fill/drain plug
Submerged Outboard
A submerged outboard will require service within a few hours by an authorized dealer once the outboard is
recovered from the water. This immediate attention by a servicing dealer is necessary once the engine is exposed
to the atmosphere to minimize internal corrosion damage to the engine.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English