Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 118Get this manual
7Place gear housing in forward gearGear housing will ratchet when propeller shaft is turned clockwise when gear housing is in forward gear8Applya 14" (63mm) diameter bead of RTV Sealer (a) on water pump base 9Install gear housing as follows: aPosition gear housing so that drive shaft and shift shaft extend into drive shaft housing bMove gear housing toward drive shaft housing while keeping mating surfaces parallelc Guide shift shaft thru hole (a) in mid-section dGuide water tube into water tube guideeRotate propeller counterclockwise while pushing upward on gear housing, to align drive shaft splines with crankshaft splines fGuide end of shift shaft (b) into shift coupling yoke (c) under cowl