1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 191Get this manual
12Install thrust bearing Coat thrust bearing with Quicksilver Gear Lubricant (92-13783A24) Forward Gear Reassembly
1Press bearing onto gear (press only on inner race of bearing)
51869Mandrel (91-37350)Bearing; Lubricate I.Dwith Quicksilver 2-4-C wTeflon 19168Thrust Bearing
2Apply 2-4-CwTeflon to bore in center of gear3Press bearing into gear until bearing bottoms outNOTE: Do not apply pressing force AFTER bearing bottoms out as bearing damage could result