Gearcase Lubrication - Mercury 4 4-Stroke Manual

IMPORTANT: Inspect oil for signs of contamination. Oil contaminated with water will have a milky color to it; oil
contaminated with fuel will have a stong fuel smell. If contaminated oil is noticed, have the engine checked by your
dealer.
a - Drain plug
OIL FILLING
IMPORTANT: Do not overfill. Be sure that the outboard is upright (not tilted) when checking oil.
Remove the oil fill cap and refill with 450 ml (15 fl. oz.) of oil. Reinstall the oil fill cap.
Idle engine for five minutes and check for leaks. Stop engine and check oil level on dipstick. Add oil if necessary.

Gearcase Lubrication

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 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. Tilt outboard so that the oil drain plug is at the lowest point.
2. Place drain pan below outboard.
3. Remove vent plug and fill/drain plug and drain lubricant.
MAINTENANCE
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