1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 283Get this manual
Power Trim Assembly Removal and Installation Removal
1Remove clamps on transom bracket to free power trim wiring
WARNING
Failure to support outboard as shown could result in personal injury andor damage to outboard or boataClamps
2Raise outboard to full "Up" position and engage tilt lock leveraTilt Lock LeverSupport ToolRetaining Clips
IMPORTANT: Support outboard as shown above to prevent engine from tipping when power trim retaining pin is removedSUPPORT TOOL 38 indiameter metal rod (a used shift shaft works well)14