Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 184Get this manual
NOTE The O-ring seals have different diametersThe smaller diameter seal goes on the forward end of the spool and the larger one on the rear of spoolFigure 39All O-ring seals should always be replaced when rebuilding the lower units
9Install gear housing cover as follows
AInstall new O-ring sealsFigure 40
Figure 40Installing O-rings in Cover
BSlide cover down driveshaftC Apply sealant to threads of cover screws Special Tool NoT 8983 Install screws finger tight10Install water pumpas outlined in this section under water pumpATorque three (3) cover screws to 70 inIbs(80 kg cm)11 Pressure test gear housing as follows :
Figure 39Installing O-rings on Spool