1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 182Get this manual
POWERHEAD
3Install new sealing ring
aSealing Ring NOTE: It is recommended that the piston pin and piston be installed on the connecting rod prior to installing the connecting rod on the crankshaft to avoid possible bending of the rod during piston pin installation4Install piston onto connecting rod as follows: IMPORTANT: When replacing needle bearings, replace all needles as setDO NOT use old and new needles togetheraLubricate sleeve of Piston Pin Tool with Needle Bearing Assembly Lubricant or 2-4-C with TeflonbHold lower locating washer and sleeve onto piston pin bore of connecting rod and install needle bearing set of 24