Home › Forum › Ask A Member › lower unit drive shaft seal for ’68 100 hp V4 Johnson? › Re: lower unit drive shaft seal for ’68 100 hp V4 Johnson?
Well unfortunately the driveshaft doesn’t just slide up & out. It has a pinion nut that holds the pinion gear on a taper. It is kind of hard to assume any particular seal is your problem. It would be better to replace the seals on a motor of this age! The seals under the water pump plate are back to back. #312083 & available from ME. The propshaft seals are back to back also. #310599 or 18-2012 Sierra also from ME. The propshaft seals can be gotten to by pulling the end cap. This way you don’t disturb everything else & don’t have to have special tools. If I am forgetting anything someone will be along to set me straight. Been a long time since I have done one of these dinosaurs. Best of luck to you!
Dan in TN
PS: Be sure & get an O-ring for the rear cap #310414. Almost forgot that!