Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 224Get this manual
10Remove inner a-ring from shock rod piston Memory Piston Removal
15Remove memory piston from cylinder using one
of two methods: aUsing lock ring pliers (Craftsman PI 4735) or suitable tool+51199
aShock Piston
11Remove cylinder end cap assembly from shock rod 12Inspect shockIf wiper (located in cap) has failed to keep rod clean, replace wiper
bBlowing compressed air into manual release
valve hole using adaptor (PIN 91 -822778A3)
13Place end cap on clean work surface14Remove rod wiper, inner a-ring, and outer o-ring