Mercury 15 EFI SeaPro Installation, Operation & Maintenance Manual page 107

1. Position a clean drain pan under the gear housing and remove the fill and
vent screws with gaskets from the gear housing.
2. Inspect the gear lubricant for metal particles. Presence of a small amount
of fine metal particles resembling powder indicates normal wear.
Presence of larger particles or a large quantity of fine particles indicates a
need for gear housing disassembly and component inspection.
3. Note the color of the gear lubricant. White or cream color indicates the
presence of water in the lubricant. Check the drain pan for water
separation from the lubricant. Presence of water in the gear lubricant
indicates the need for disassembly and inspection of oil seals, seal
surfaces, O‑rings, and gear housing components. Pressure check the
gearcase prior to disassembly.
NOTE: When draining the gearcase for the first time, lubricant may appear
cream colored due to the mixing of assembly lubricant and gear lubricant. This
is not an indication of water intrusion. If, during subsequent draining of the
gearcase, lubricant appears cream colored or milky, water may be present.
The gearcase should be disassembled and all gaskets, seals, and O‑rings
replaced. Inspect all components for water damage.
NOTE: Gear lubricant drained from a recently run gearcase will be a light
chocolate brown in color due to agitation/aeration. Oil that is stabilized will be
a clear yellow brown in color.
GEARCASE LUBRICANT CAPACITY
Approximately 460 ml (15.6 fl oz).
GEARCASE LUBRICANT RECOMMENDATION
Mercury or Quicksilver Premium or High Performance Gear Lubricant.
eng
MAINTENANCE
64165
97
a - Vent screw
b - Fill screw
a
b