1983 Yamaha 30EN Outboards Service Manual, Page 71Get this manual
3 After installing the oil seals, pack their lips with water-resistant grease (Yamaha all-purpose grease, PIN LUB-
GREAS-13-001
4Piston installation aHold the crankshaft, and bring the upper cylinder piston into the upper cylinder while holding down the piston rings so that they do not catch the cy Ii nder bottom edgeWhen the second ring is in the cylinder, stop inserting the pistonNOTE: Hold the crankshaft at right angles to the cylinder bodyFit new O-rings in the grooves in their outer surfaces
Cylinder body 1Thoroughly clean the bench, and place the cylinder body with the head side downApply the outboard motor oil to the upper and lower cylinders