Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 71Get this manual
7Remove sealing ring (a) 8Remove (and discard) piston pin lockrings (a) from both ends of piston pin bore
ACAUTION
Eye protection MUST BE worn while removing piston pin lockrings from pistonIMPORTANT: Identify upper (#1) and lower (#2) pistons and connecting rodsStore piston pin, piston pin needle bearings, locating washers, connecting rod big-end bearings, rod caps and rod cap screws together with corresponding piston and connecting rod for reassembly