Changing - Mercury MerCruiser Service Manual

3. Replace the cap.

Changing

1. Remove the gear lube monitor cap.
2. Bravo One models:
a. Remove the propeller.
b. Position the sterndrive unit to the full down position.
c. Remove the oil fill and drain screw and sealing washer.
d. Drain the fluid into a suitable container.
a
b
3. All other models:
a. Place the sterndrive unit in full trim out position.
b. Remove the oil fill and drain screw and sealing washer.
c. Drain the fluid into a suitable container.
4. Remove the oil vent screw and sealing washer. Allow the fluid to drain completely.
b
a
IMPORTANT: If any water drains from the unit, or if the fluid appears milky, the sterndrive unit is leaking. See your
authorized Mercury MerCruiser dealer.
5. Lower the sterndrive unit so the propeller shaft is level.
IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in the sterndrive unit.
6. Fill the sterndrive unit through the oil fill and drain hole with specified gear lubricant until an air‑free stream of lubricant
flows from the oil vent hole.
90-8M0099748 eng DECEMBER 2015
a - Oil fill and drain screw
b - Sealing washer
mc79506-1
a - Oil fill and drain screw
b - Sealing washer
b
a
19777
mc77106-1
a - Oil vent screw
b - Sealing washer
© 2016 Mercury Marine
Maintenance
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