What is the correct procedure for changing the lower unit gear case oil on a Honda BF130A outboard?

Question

What is the correct procedure for changing the lower unit gear case oil on a Honda BF130A outboard?

Answer 1

Put a pan under lower unit to catch old lube.  Remove the drain plug at the bottom of  the prop shaft housing, then remove the vent s***w  located on the side of the housing about 6 to 10 inches above the prop shaft.   Let the lube drain out completely, then pump new fluid into the lower hole and fill till it comes out the upper vent hole.  Insert the s***w into the upper vent hole and tighten while keeping the filler tube in the lower hole.   Then remove the filler tube and quickly insert the lower drain plug and tighten.   Clean up the oil off the lower unit and dispose of the old oil properly.  

VERY IMPORTANT - make sure that you do not lose the washers (Rubber or plastic) off either s***w when putting them back in.

Good luck!

Answer 2

That is the better way, but you probably are thinking "I don't have a pump" No problem, use the oil in tubes and squeeze in through the bottom hole. You can also fill from the top hole, BUT....You have to allow time for air bubbles to work their way out.

Which ever way you go, re-check the level after about an hour  or so of running.