6 - M
AINTENANCE
90-8M0114811 JANUARY 2016
49
1
2
3
4
5
6
7
8
9
2. Remove the upper oil level plug and sealing washer from the
gearcase.
a -
Level propeller shaft centerline
b -
Fill/drain plug and sealing washer
c -
Oil level plug
IMPORTANT: If water drains from the gearcase, or if gear lubricant
appears milky; the drive unit is leaking. Have the unit checked
immediately by your authorized Mercury Marine dealer.
3. Remove the lower fill/drain plug and sealing washer from the
gearcase and allow the oil to drain into a suitable container.
4. Fill the drive unit with fluid through the lower fill/drain hole until
oil comes out of the top oil level plug opening.
5. Install the upper oil level plug and sealing washer.
6. Remove filler tube and quickly install the lower fill/drain plug
and sealing washer.
c
a
b
45711
Tube Ref
No.
Description
Where Used
Part No.
SAE 85W-90
Mercury Racing
Gear Oil
Drive unit
8M0078015
P
ROPELLERS
!
WARNING
Rotating propellers can cause serious injury or death. Never
operate the boat out of the water with a propeller installed. Before
installing or removing a propeller, place the drive unit in neutral and
engage the lanyard stop switch to prevent the engine from starting.
Place a block of wood between the propeller blade and the
anti‑ventilation plate.
NOTICE
Operating the engine with a loose propeller can damage the
propeller, the drive, or drive components. Always tighten the
propeller nut or nuts to specification and check for tightness
periodically and at the required maintenance interval.