Posted by Owen Aaland on August 06, 2009 at 22:39:45 from (65.174.247.87):
In Reply to: Farmall H noise posted by Bill Bowen on August 06, 2009 at 13:15:57:
Looking at how they broke will give a clue to the reason for the failure. They are more likely to fail from being too loose rather than too tight. A properly tightened bolt will be stretched a little bit but not so much they will not return to the same length when removed. (Torque to yield bolts are tightened to a point beyond where they will return to there original length. That is why they are to be replaced rather than reused.)
The friction between the flywheel and the crankshaft is what keeps the flywheel from moving on the crank. As long as the dowel pin is still in good shape it is unlikely that they sheared off. Sheared bolts will have the metal smeared off to one side. A bolt that has sheared on a baler is good example of this type of failure. A more likely cause in your case is they were not tight enough to have been stretched properly This will allow movement/vibration between the crank and flywheel. This little bit of movement causes the bolt to stretch just a bit, maybe less than .001 of an inch. This isn't much movement but over time it work hardens the metal to the point where it becomes brittle. If this is the reason for the failure the metal at the break will be crystallized. Broken head bolts usually display this type of failure.
A bolt failure from being over tightened will usually have a circular pattern in the metal as a result of the twisting.
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