1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 253Get this manual
10Remove inner o-ring from shock rod piston Memory Piston Removal
15Remove memory piston from cylinder using one of two methods: aUsing lock ring pliers (Craftsman PN 4735) or suitable tool
aShock PistonO-ring
11Remove cylinder end cap assembly from shock rod12Inspect shockIf wiper (located in cap) has failed to keep rod clean, replace wiper13Place end cap on clean work surface14Remove rod wiper, inner o-ring, and outer o-ring
bBlowing compressed air into manual release valve hole using adaptor (PN 91-822778A3)