05-06-2022, 04:35 PM
(This post was last modified: 05-06-2022, 04:37 PM by David Stepney.)
I think that you may have found the problem. The boss on the flywheel is contacting the rear bearing before the taper has gripped. As Howard, suggests, make sure there is clearance between the boss and the bearing inner race. Plastigage is the stuff to use for clearance in inaccessible places.
I wouldn't worry too much about using grinding paste with the crank in situ. You will only need the lightest smear of paste on the taper, but make sure that you have got that clearance between the flywheel and the bearing. Once you have, I would trial fit the flywheel, tighten it and check the fit before going much further; from your photos, the taper faces don't look too bad.
If the boss need taking down, the best way is with a lathe, but I have filed them in the past. It depends whether you can file flat.
I wouldn't worry too much about using grinding paste with the crank in situ. You will only need the lightest smear of paste on the taper, but make sure that you have got that clearance between the flywheel and the bearing. Once you have, I would trial fit the flywheel, tighten it and check the fit before going much further; from your photos, the taper faces don't look too bad.
If the boss need taking down, the best way is with a lathe, but I have filed them in the past. It depends whether you can file flat.