1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 327Get this manual

5Remove memory piston from cylinder using lockring pliers (Craftsman PN 4735) or suitable tool Trim Rod Disassembly
1Place trim rod assembly on clean work surface2Remove screws securing plate to trim rod piston and O-ring3Remove check ball components from trim rod piston
LOCK-RING PLIERSScrew (3)Plate
cO-ringPiston

CAUTION

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives