1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 256Get this manual
REASSEMBLY IMPORTANT: Components must be dirt and lint freeSlightest amount of debris in Power Trim system could cause system to malfunction1Apply Automatic Transmission Fluid (ATF) Type (Dexron II) on O-rings during reassembly 4Install components, as shown
NOTE: Refer to "Tilt Ram Components" for proper O-ring sizesInstall O-rings2Insert cup into housing
a Piston Roll Pin Check Valve Assembly O-ring