Gearcase Lubricant - Mercury 40 FourStroke Maintenance And Installation Manual

2. Idle the engine for five minutes and check for leaks. Stop the engine and
check the oil level on the dipstick. Add oil if necessary.
a

Gearcase Lubricant

GEARCASE LUBRICATION - FOR 87.3 MM (3-7/16 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.
2. Place a drain pan below the outboard.
3. Remove the vent plug and fill/drain plug and drain the lubricant.
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MAINTENANCE
a - Oil fill cap
28418
a -
b -
a
b
26973
69
Vent plug
Fill/drain plug