There's some really excellent posts on installing the seal.
The seal I.D. rests on the Spacer Ring, but for the M110 I'm working on now, there's a big distance between where the Seal seats in block & the Timing Chain Sprocket, allowing the Spacer Ring to probably wonder in between both along the crankshaft. Do I need to install an extra spacer to keep a Spacer Ring positioned inside the Crank Seal? I would think my present setup would let the Spacer move towards the Timing Chain Sprocket & loose contact with the Seals I.D.
Some Crankshaft Seals have a full outer flange, some with 1/2 a flange 7 some with none. Wouldn't the Seal with the full flange be preferred?