It's hard to know just how hard it was to turn when you were assembling it. And are you sure the starter is really trying to turn it? You can put a wrench on the front nut and try to turn it through. It should not be that difficult, after all, they were intended to be hand crankable.
With a new rope rear main seal there will be some resistance, but if the crank was getting hard to turn as the mains were tightened, something is seriously wrong! Did you measure the crank, and order the appropriate size bearings? Was everything clean? Were the ring end gaps checked?
Your options are to try to pull start it, but "if" the bearings are tight, the crank and new bearings will be destroyed, along with filling the engine with metal shavings, possibly spinning a main bearing! I know pull starting a tight engine has been done, but I could never get so lucky!
The other option is to drop the pan and find out what is wrong. You should be able to hand move each rod laterally on the crank. If loosening the main bearing caps makes a difference, there is a clearance problem.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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