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The last flywheel I looked at had locating pins so all the bolts were doing was holding the flywheel to the crank. The pins took the twisting torque. The bolt torqueing process puts the bolt in tension which keeps it seated. Your head bolts are torqued accordingly and have no other locking mechanism as are most of the bolts in your tractor that bolts non vibrating items together. Your flywheel is a thick, heavy, mass designed to smooth out vibrations of the rotary motion components. Hence it's solid and it's not going to "rattle" loose, nor do any jerking around to speak of. Just last week took a '49 Ford 2n apart to reverse the starting ring and it had bolts with holes in them for safety wire..... ..no safety wire; bolts were all secure. Don't use bolts with holes anymore as I recall..... .unnecessary. No tellin if it ever had safety wire and it only lasted 56 years and is still purrin. IF a bolt should fall out where is it going to go? It will clang around inside the clutch which you could probably hear and jam up the clutch (worst case) so you couldn't disconnect the engine from the transmission. If that happens you will have to break it down anyway. Safety issue? Just turn the engine off it'll stop. Now the bolts holding your exhaust manifold on do have clips but the exhaust manifold goes thru a hugh temp gradiant which COULD work to loosen the mounting bolts..... your flywheel to crank interface does not. Your call. Lotta work and worryin for nuttin if you ask me. My 2c Mark
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