Mercury 4 4-Stroke Manual page 45

a - Vent plug
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 195 ml (6.6 fl. oz.).
GEARCASE LUBRICANT RECOMMENDATION
Mercury or Quicksilver Premium or High Performance Gear Lubricant.
CHECKING LUBRICANT LEVEL AND REFILLING GEARCASE
1. Place outboard in a vertical operating position.
2. Remove vent plug from vent hole.
3. Place lubricant tube into the fill hole and add lubricant until it appears at the vent hole.
a - Vent plug
b - Lubricant at vent hole
IMPORTANT: Replace sealing washers if damaged.
4. Stop adding lubricant. Install the vent plug and sealing washer before removing the lubricant tube.
5. Remove lubricant tube and reinstall cleaned fill/drain plug and sealing washer.
MAINTENANCE
b -
c -
41
a
b
ob00497
Fill/drain plug
a
b
c
ob00498
Fill/drain plug