Yikes that sounds bad, 65Monza140. Any idea how long since the motor last ran, and/or was it stored outside for a long time? If it's all that seized up it might not be a great candidate for rebuilding. Could be a challenging teardown. Start by removing the heads, see if the nuts & rocker studs come off without turning the long cylinder studs in the block. Then remove the top blower cover, which will grant you access to some of the CR nuts, depending on the crank position. You may be able to remove a few CR/piston/cylinder assemblies as a unit. For the others, see if you can slide the cylinders off the pistons, then remove the bolts holding the block together to get the crank out with the remaining CRs.65Monza140 wrote: ↑Wed Sep 13, 2023 9:33 pm I can't get my 140 crank unfrozen so it's going to be a bear to tear down, and I dread what I will find after reading the good stuff to think about in this thread....
My 140 sat in my garage for 22 years. When I started the teardown in 2022, I didn't want to turn the motor for fear of scoring cylinders, bearings, etc, but oops, it spun quite freely when I tried to remove the HB bolt. Happily, nothing was damaged and my rebuild was mostly a ring, valve and reseal job. Bearings, cam & lifters were fine, they had only 10K miles on them and had almost no wear.
Good luck with your teardown, penetrating oil and a rubber mallet are your new best friends.