Re: Volvo SX drive Re installation
No need for any sealant.
As far as replacing oring........ YES, replace them.
Orings that are used for gaskets should be treated as paper gaskets and get replaced after use.
Cheap insurance for a water leak into your drive or cooling system.
replace all three o-rings (2 on main shaft) and one around the water intake on the housing ,lube the splines, oil the oil rings on the shaft, dont lube where the o-rings go though, put drive into gear so you can rotate the prop slightly to get the splines to line up, slowly push drive in.
i BELEIVE you dont need to use an engine alignment tool to re-install as long as you didn't move the engine at all, which most of us dont....i could be wrong though, someone like don could re-inforce or correct me on that.