Refilling the lower unit procedure is outlined first.
This, of course should be done after you remove and replace the impeller.
Start by removing the lower drain screw and draining any old oil from the lower unit.
opening the top screw, as seen on the left in this picture, will allow the oil to flow out a little quicker.
Take note of the color of the lower unit lube or oil, it should be brownish or yellow, but not milky or blackish colored.
A milky appearance indicates water in the lower unit.
Darker coloration just means the oil hasn't been changed in a very long while.
The lower unit oil (grease plug) refill screw on the right
location is shown in the picture above.
NOTE: this is the lower of the grease/oil lube screws. the flathead screw on the left (upper screw) is the gear lube vent screw. This is removed when the lower unit is filled through the lower screw hole.
Fill by pumping oil into the lower screwhole until it starts to come out of the top screwhole. Then replace the top screw and washer, to creat a vacuum and cause the oil to not leak out when the hose is removed from the lower screwhole until you quickly replace the lower screw and washer.
Now your lower unit is refilled!
NOW:
Locate the shift lever, you'll see the shift cable attached with a flathead screw. loosen that first (remember to retighten after everything is put back together)
NEXT: removing the four 7/16" bolts on the lower unit should allow the two sections to be separated easily.
take note of the oil or lube color. This is fresh lube and what your lube (or oil) should look like.
removing four flathead screws
and make sure to also loosen the screws that hold the shift cable in place, at the shift lever on the side of the engine block, or the unit won't drop down.
allows access
to the impeller housing.
taking a closer look at the parts encountered during removal of the impeller housing.
With the parts all pulled out, the impeller is easy to remove and replace.
feed the shift cable (if it's not damaged on the end) back through it's tube as you slide the impeller housing back into place.
You will want to oil the cable up as you slide it to help it fit through.
watch for the wire to poke through the hole.
grab cable with pinch nose pliers
You will see the ball end on the lower unit snug into place.
NOTE: you will likely have to jiggle the prop left to right to get the gears to seat so the driveshaft slides back in place when reassembling.
As long as the motor is laying down and not standing upright on a sawhorse, you should be fine.
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