1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 203Get this manual
4Install water tube seal; lube I.Dof seal with Quicksilver 2-4-C wTeflon (92-825407A12)5Apply bead of RTV Sealer as shown 8Install components as shown in appropriate photo
19215Water Tube SealRTV Sealer 19883
CAUTION
Do not use lubricant on top of drive shaftExcess lubricant, that is trapped in clearance space, will not allow drive shaft to fully engage with crankshaftSubsequently, tightening the gear housing fasteners (while lubricant is on top of drive shaft) will load the drive shaftcrankshaft and damage either or both the power head and gear housingTop of drive shaft is to be wiped free of lubricant6Apply light coat of Quicksilver 2-4-C wTeflon onto drive shaft splines7Apply light coat of Quicksilver 2-4-C wTeflon on gear case shift shaft splines and upper shift shaft splinesDo not use lubricant on ends of shift shafts