1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 290Get this manual
1Inspect check valve and check valve screen for debris; if debris cannot be removed, replace trim rod assemblyClean trim rod with parts cleaner and dry with compressed air Trim Rod End Cap Seal
1Inspect trim cap end seal and replace if damaged or if seal does not keep trim rod clean
51343Seal (Remove as shown)
2Install new seal with seal lip up
TRIM ROD INSTALLATION IMPORTANT: Components must be free of dirt and lintAny debris in the system can cause system to malfunctionaCheck ValveCheck Valve Screen