1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 337Get this manual
Purging Power Trim Unit Manual release valve must be in full closed position during power trim purging and operation1Secure power trim unit in soft jawed vise2Remove fill capAdd Quicksilver Power Trim and Steering Fluid (92-90100A12) or Automatic Transmission Fluid (ATF) Type F, FA or Dexron II up to threads of reservoirInstall cap
Power Trim Unit Installation
1Apply 2-4-C wTeflon (92-825407A12) to lower pivot pin bore and pivot pin surface2Position trim cylinder assembly (BOTTOM FIRST) between clamp brackets and route trim pump electrical harness through access hole in starboard clamp bracket3Start lower pivot pin into pivot pin bore and position lower cross pin (RETAINED) in its respective hole