1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 318Get this manual
Power Trim Rocker Arm Power Trim Date Code 14182 and BelowRefer to Service Bulletin No92-12Outboard in the trim position will not trim up or down OR pump motor will lock up (not turn) in either directionOutboard in the tilt position will not tilt up or down OR pump motor will run slow in either directionSingle ram power trim that will not trim or tilt up or down may have pumpmanifold assembly with broken rocker arm1Replace broken rocken with improved rocker arm assembly 823180A1