oil seal depth-critical?
 

In the process up overhauling the K321 for my 148R project. Was installing the rear oil seal today and got over-zealous and seated it too deep--about 1/4 inch instead of the 1/8 inch. This is on the PTO side of the engine. It is square in the bore, and looks OK, but is deeper than the spec. Is this going to be a problem? Can't remove the seal without ruining it and was wondering if I need to do that and start over. Any advice appreciated. I have another seal on order, just in case.

I've had them go in a little to deep before and never worried about them. usually there's a groove in the crank where the old seal rode for years so you probably have a better seal with it set a little deeper

Usually the seal from the factory was set a little deep. That way, when the seal was replaced, the new seal was installed flush with the case, so the seal ran on a "new" part of the crank. I wouldn't worry about it. You might only get 30 years of wear instead of 40 years of wear.

I wound up removing and replacing the seal to the correct depth. I was concerned that the seal might "fall into" the bearing. Seems the bore is only about 3/8 inch deep I think the seal was far enough in that it was partially past the bore. Problem solved, only $12 wasted. Seating it flush would have been a good idea, but it's too late for that now.