i was just going to add some oil to tilt unit ,the fill plug was stuck ,so i proceeded to take the unit apart to drill out fill plug ,& install new plug.being carefull not to loose any parts inside when i took the case apart.a small checkball fell down from somewhere in pump ,i dont know where it goes .i need schematic of this tilt unit (prestolite # 172513 ) fits 30,40,&60hp. 1971 johnson outboards.or somebody that knows how this unit goes back together ?it worked before ,but was slow going up .thanks for any info. 
