Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 352Get this manual
MANUAL TILT ASSIST
3Remove check ball components from shock rod piston4 Remove o-ring
aSpring (5)
cBall (5)O-ring
ACAUTION
When removing shock piston, spanner wrench must have 14 inx 516 inlong pegs to avoid damage to shock piston5Place shock rod into soft jawed vise and apply heat to loosen piston using torch lamp