1. How does the head of a bolt just shear off inside a carburetor?
Don't know, but I've had it happen more than once. Brass parts seem do less damage than steel.
2. I've never overheated the engine or had any trouble before the screw made it knock so how could my head warp?
The head could have been warped long before this. Overtorquing or improper order of torquing could have led to warping, but so long as it was tight, it may not have leaked. It could even have left the factory with an unseen issue, but so long as it didn't leak, it wasn't an issue for them.
The torque specifications have been upped when tightening down these engines' heads. Offhand I don't remember what the torque recommendation was for the last engine I did, but I remember it was higher than any manual I had listed it. If you have an older book, or an IT/I&T manual, it may be wrong. Ask your gasket supplier for the mfr.'s recommended specs.
AG
This post was edited by AG in IN at 17:30:45 07/05/14 4 times.
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