1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 122Get this manual
POWERHEAD REASSEMBLY Place locating washers (a) on connecting rodCarefully position piston over end of rod Make sure locating washers remain in place
Now insert piston pin 1001 ("a" -9174607 I) and push sleeve (b) oul of piston as shownKeep pi ston pin too] in pi ston