Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 165Get this manual
4Place shock rod into soft jawed vise and apply heat to shock piston using torch lamp (PIN 91-63209) 5Loosen shock rod piston using spanner wrench [14 in 5116 in (6.4mm Bmm) long pegs] 6Allow shock rod piston to coolRemove from shock rod ACAUTION
Do not remove check ball components from shock rod pistonRemoval and reinstallation of check valve could result in improper operating pressure and possible manual tilt system damage7Inspect check valve for debris; clean debris from check valve if foundIf debris cannot be cleaned from check valve, replace trim rod piston as an assembly8Clean trim rod and components with parts cleaner and dry with compressed air9Remove inner O-ring from shock rod piston