i usually fill it, then turn the prop shaft several times. let it sit. the turn again, then drain. works great if you have had water intrusion, and have milk shake in the lower.
We've used mineral spirits on those older units and let it run for a minute or so. No more than 2 minutes though. Running it let the solvent go thru the pump and help clean crud from that screen. If the plunger was starting to stick it would help sometimes shift it a few times. On the newer mechanical shift there's no reason to shift it.
And then replace with a good 80 or 90 weight lower unit gear lube or the Hi Vis OMC stuff which I like to use. They also sell synthetic LU oil which is supposed to be pretty good.
I knew someone would come along and say run it for an instant or two.
Gotta be careful though since you're running it w/o lube. I didn't want to confuse the issue with the poster who was eagerly waiting to finish up a job.
Flush it though this time. Maybe handcrank next time, or run it briefly for a minute or so.
thanks to all for your advice i used alittle bit of everyones advice and verything a go , taking it out for long run fri. gona take a kicker just incase.thanks again to everyone for your help
I hope you remembered to take the mineral spirits out right??? lol
Seriously though, I hope you replaced the vent and drain gaskets after filling with new lube, that is the number one spot for water intrusion and a likely candidate if that was the case.