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1951 M Flywheel bolts sheared!

C

CrvnJ

Member
Well, I posted earlier this week about turning the flywheel without it turning the crankshaft. Several great suggestions were made as to the cause, mostly broken crankshaft or sheared flywheel bolts
Upon splitting the tractor...The winner is: Sheared flywheel bolts.
Now, my new questions are:
1) What could have caused this to happen? And,
2) What is the best way to go about repairing and preventing from occurring again?

Thanks!
 
couple guesses. first, bolts were not torqued tight enough, and over time loosened up, causing them to shear. or, someone put softer grade bolts in and they let loose. if the threads are still good, replace the bolts with the correct ones, and dowel pins, (may need to go to case i-h and get em) a little dab of lock-tite on each bolt will help.
 
i looked back at your other post and saw you have a chipped piston on cly number 2. i would pull that piston and check the wristpin, and also the rod bearing. having the tractor split at this point, you may want to think about doing a major on the engine. yt has the rebuild kits , and if you need a clutch, call mike at steel wheel ranch, he can set you up with the whole works very reasonable.
 
Never suspected that unless the bolts got loose and would think it would make noise before letting go. Was the dowel pins in the crank and did it shear those to? Did the bolts have the metal locks on the bolt heads?
 
Another option is too much torque on the bolts. Excess torque can and has caused many assembly failures. The bolts should be easy to remove. slot them with a dremel cutoff, and unscrew them. Jim
 
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