Gear Housing Pressure Test; Filling Gear Housing With Lubricant - Mercury 45 Jet 50-55 Service Manual

Gear Housing Pressure Test

1. Remove vent plug and install pressure test gauge
2. Pressurized housing to 10 to 12 psi and observe
gauge for 5 minutes.
3. Rotate drive shaft,prop shaft and move shift shaft
while housing is pressurized to check for leaks.
4. If pressure drop is noted, immerse housing in wa-
ter.
5. Re-pressurize to 10 to 12 psi and check for air
bubbles.
6. Replace leaking seals as necessary. Retest hous-
ing.
NOTE: Gearcase should hold 10 to 12 psi for 5 min-
utes.
7. Remove tester from housing and install vent plug.
90-817643R1 DECEMBER 1996
Filling Gear Housing With
Lubricant
NOTE: Gear housing lubricant capacity is 22.5 fl. oz.
(665.2ml).
WARNING
If gear housing is installed on engine, to avoid
accidental starting, disconnect (and isolate) spark
plug leads from spark plugs before working near
the propeller.
CAUTION
Do not use automotive grease in the gear housing.
Use only Quicksilver Gear Lube or Quicksilver
Super-Duty Lower Unit Lubricant.
1. Remove any gasket material from "Fill" and "Vent"
screws and gear housing.
2. Install new gaskets on "Fill" and "Vent" screws.
IMPORTANT: Never apply lubricant to gear hous-
ing without first removing "Vent" screws or gear
housing cannot be filled because of trapped air.
Fill gear housing only when housing is in a vertical
position.
3. Remove lubricant "Fill" screw and gasket from
gear housing.
4. Insert lubricant tube into "Fill" hole, then remove
"Vent" screws and gaskets.
5. Fill gear housing with lubricant until excess starts
to flow out of one (first) "Vent" screw hole.
LOWER UNIT - 6B-31