Is it possible to overfill the lower unit? I pumped oil into the lower opening until oil came out the top opening. I believe the lower unit is supposed to hold 39oz. I originally used 2 10oz tubes ( of course I may have lost 5 or 6 oz) but when I used a pump on a 32oz bottle it took all of it before it came out the top. That would add up to between
46 and 52 oz.
No, you can't overfill it. In fact, you are supposed to fill it until the oil flows out the top. You then put the top plug back in (with the fill tube still connected to the lower hole). This creates a vaccum to keep as much of the oil in as possible when you quickly remove the tube and insert the lower plug.
PS - make sure the engine & lower unit are verticle (the cavitation plates should be level) when you fill the lower unit. Otherwise you will not fill the lower unit completely. And if the oil you drain out was milky looking you have a bad seal and water is getting into the lower unit (which will need to be fixed or you will damage the gearing).
You probably need to tilt the unit up a little to get all the old lube out, then lower it to level to insure you get it full.
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