In Reply to: Putting 8N back together posted by Cal Sexsmith on August 31, 2019 at 19:24:12:
Excellent choice to stop and find the problem rather than forcing anything. Check for misalignment all the way around the bellhousing. Guide pins help a lot, but it is still possible to have both ends too high, too low, or angled in some way. It might take a tape measure to see a difference top to bottom or side to side. If the PTO shaft is in it, I've put tranny in a high gear, engaged the PTO, grabbed a big pipe wrench and used the PTO shaft to turn the tranny a bit. Try pushing the clutch pedal then rotating the engine or tranny back and forth a bit. Either the two halves suddenly go together, or you hear something wrong.
With only 1/2" to go, The input shaft is already into the clutch splines, the only thing left is the pilot bearing in the flywheel, as has been suggested, and at about 1/4" there are the two small pins on either side of the engine flange.