Mercury 40 Service Manual page 506

Filling Gear Housing with Lubricant
NOTE: Gear housing lubricant capacity is approximately 14.9 fl oz (440 ml).
If gear housing is installed on outboard, disconnect (and isolate) spark plug leads
from spark plugs before working near the propeller.
Do not use automotive grease in the gear housing. Use only Quicksilver Gear Lube.
1. Remove any gasket material from "Fill" and "Vent" plugs and gear housing. Install new
gaskets on "Fill" and "Vent" plugs.
IMPORTANT: Never add lubricant without removing "Vent" plug. Gear housing can-
not be filled because of trapped air. Fill gear housing when driveshaft is in a vertical
position.
2. Remove "Fill" plug and gasket.
3. Insert lubricant tube in "Fill" hole, then remove "Vent" plug and gasket.
4. Fill until excess lubricant flows out of "Vent" hole. Let gearcase sit for at least one minute
to allow lube to settle out, then top off.
5. Replace this "Vent" plug and gasket.
6. Install "Fill" plug and gasket.
a -
7. Torque "Fill" and "Vent" screws to 55 lb-in. (6.2 Nm).
90-828631R3 MARCH 1999
"Vent" Plug
WARNING
CAUTION
a
NON-BIGFOOT GEAR HOUSING
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