How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
Never mind I figured it out
yes
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
In the lower unit or gearbox
It is easy...remove the lower unit..about 5 bolts. If you want to see this done YouTube it...a lot of good videos for DIY.
The water pump is inbetween the lower unit and the motor . Remove the lower unit with 6 bolts and u will see it.
First remove spark plug wires from plugs so engine does not start unexpectedly. Second remove lock nut under the trim tab just above the prop. There is also a metal screen this nut holds to strain the cooling water going into the engine. Next remove the lock nut just above the lower unit. This will also help split the lower unit away. next remove lower unit watching for the water pickup tube. Place lower unit in a secure area and remove the two nuts holding the plastic cover down. Then remove the 2 o rings on the drive shaft so plastic housing can be taken off. Remove metal plate over water impeller. Remove old impeller watching for the small pin that the drive shaft uses to turn the impeller. use a little motor oil on the new impeller. Replace metal cover and plastic housing while turning drive shaft clockwise. Press down replace lower unit.
I suspect that it would, but you can verify this by simply calling a local Mercury dealer and asking one of their professionals in the shop.
undo t 5 bolts, remove lower unit, remove pump cover, slide old impeller off & replace with new one. Mske sure wesr plates & gaskets are good & replaced in correct order. put a little grease on top of unit & that's it.
You don't put motor oil in a lower unit. Get a few tubes of lower unitgear lube from a marine supply dealer and a device to squirt it in. Remove the screws at the top and the bottom. Drain the old lube out. squeeze the new lube in from the bottom till it comes out the top, then re install the screws. Do this at the end of every boating season.
Look inside the trunk for the wing nuts to remove the unit.