Gearcase Lubrication - For 108 Mm(4 - 1/4 In.) Diameter Gearcase - Mercury 40 Operator's Manual

a - Vent plug
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 340 ml (11.5 fl. oz.).
CHECKING GEARCASE LUBRICANT LEVEL AND REFILLING GEARCASE
1. Place outboard in a vertical operating position.
2. Remove vent plug.
3. Place lubricant tube into the fill hole and add lubricant until it appears at the 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.
a - Vent hole
b - Vent plug
Gearcase Lubrication ‑ For 108 mm (4 ‑ 1/4 in.) Diameter Gearcase
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 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.
MAINTENANCE
b -
a
b
c -
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a
b
ob00439
Fill/drain plug
Fill/drain plug
c
ob00440