1983 Yamaha 30EN Outboards Service Manual, Page 70Get this manual
5With the UP mark facing toward the crankshaft tapered end, insert the connectingrod into the piston so that the small end hole aligns with the piston pin Oil seal housing ,
When press-fitting the oil seal, be sure that it faces in the correct directionCrank upper oil seal housing: Using the jig, press-fit the oil seal housingPlace washers on both sides of the small end, and insert the piston pin into the small end so that the jig in the small end is pushed out, then push the pin into the other side piston pin hole2Crank lower oil seal housing: aUsi ng the jig, press-fit the two oil seals (smaller in outsi de diameter) one by one