1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 303Get this manual
Gear Housing Pressure Test 1R emove vent plug and install pressure test gaugeTighten securely
Gear Housing Installation
Filling Gear Housing with Lubricant
NOTE: ar housing lubricant capacity is approximately 14.9 floz(440 ml)
WARNING
If gear housing is installed on outboard, disconnect (and isolate) spark plug leads from spark plugs before working near the propeller
CAUTION
Do not use automotive grease in the gear housingUse only Quicksilver Gear Lube
1R emove any gasket material from "F illand "Vent "
plugs and ge ar housingInstall new gaskets on "F illand "Ventplugs
IMPORTANT: Never add lubricant without removing
"Vent" plugGear housing cannot be filled because of trapped airFill gear housing when driveshaft is in vertical position