Posted by Janicholson on August 06, 2009 at 13:49:26 from (64.61.211.28):
In Reply to: Farmall H noise posted by Bill Bowen on August 06, 2009 at 13:15:57:
Over tightening is a highly possible answer. When a bolt is over tightened, the strength of the bolt is compromised. The holding force is the tensile strength of the threads at the point they (usually) taper into the shank. If the bolt is at 90% of its strength, the bolt has only 10% of its strength left to hold things together when external force is applied. If 50% tight, 50% remains. Bolts torqued to 10% of their strength have 90% left. That is why the use of a torque wrench is now SOP in tire shops. IT applies to all bolts. Engineers know bolt strength, and the specification is the spec. Used bolts can also cause it. they fracture because they are already stretched. If actually loose, the bolts can snap from shock loading, or continued working in shear stress. I hope this helps. The use of other bolts is not recommended the shank size will not be appropriate, and even if grade 8, or titanium, they will not correct rotary shear at the shank. Original bolts are the real thing. Don't split it twice. JimN
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