Mercury 40 FourStroke Maintenance And Installation Manual page 80

Gearcase Lubricant Capacity
Gearcase lubricant capacity is approximately 340 ml (11.5 fl oz).
Checking Gearcase Lubricant Level and Refilling Gearcase
1. Place the outboard in a vertical operating position.
2. Remove the vent plug.
3. Place the 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 the lubricant tube and install a cleaned fill/drain plug and sealing
washer.
a - Vent hole
b - Vent plug
c - Fill/drain 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.
Draining Gearcase
1. Place the outboard in a vertical operating position.
MAINTENANCE
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