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Old 03-23-2016, 08:56 PM   #1
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My generator started make the scraping sound and come to find out two mounting bolts have sheered off. So I am in the processed drilling out at least one of the bolts. As pictured, I have figured out to get to the back one I would need to remove the Generator..... So one for now.

Should I use a grade 8 bolt for this? If not what should I use?

Thanks

Sam
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Old 03-23-2016, 09:06 PM   #2
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Look at the other mounting bolts and get the same thing. Count the number of lines on the head if fractional or xx.9 if metric.
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Old 03-23-2016, 09:20 PM   #3
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Quote:
Originally Posted by porky69 View Post
Look at the other mounting bolts and get the same thing. Count the number of lines on the head if fractional or xx.9 if metric.

I was hoping to improve what I had. They both have broke.

Sam
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Old 03-23-2016, 09:23 PM   #4
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I'd use grade 8.
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Old 03-23-2016, 09:25 PM   #5
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Just because they broke doesn't mean they weren't strong enough...they could have been loose or other bolts may be loose elsewhere causing these 2 to be overloaded or the mounting holes are worn causing excess movement in the mount.

Also if the others are grade 5, going to grade 8 does not necessarily make them "stronger", while they have higher tensile(straight pull) strength they are are more "brittle" in shear load. Sometime (although rarely) going down a grade can work out better as the bolts have more give (stretch) to them.
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Old 03-24-2016, 03:25 PM   #6
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I agree with porky, I'd wonder why they broke and try to figure out what is going on to make it happen. Excessive vibration, worn out rubber isolators (or lack of) or something. No reason those should snap under normal use. Just putting in stronger bolts may let an ongoing issue get works. Also in some cases a lower grade bolt is used so that it CAN break if something bad happens, easier to replace a bolt than a mount or bracket.
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Old 03-24-2016, 05:00 PM   #7
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I (unknowingly) lost a mounting bolt on our generator (electric) motor, not the engine...and i while I'm not certain it was related i had developed a short in the stator ($2k to R&R the gen and install a new stator)...now i check ALL those bolts a couple of times a year!
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Old 03-24-2016, 08:03 PM   #8
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I will up date you guys maybe tomorrow, got my angle drive drill working and hope the rain is gone.
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Old 03-27-2016, 02:29 PM   #9
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Well so far I have gotten the bolt drilled and soaking with penetrating oil, the eas out is waiting for the oil to work and so am I. Tried with out the soak and I was about the break the eas out so...... I also cked the stator bolt on the outside and it looks great. I also could not get my battery angle drill to charge so I just torn it apart and it worked great too.

Sam
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Old 03-28-2016, 11:13 PM   #10
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Just a FYI, grade 8 is not more brittle. It is stronger, and does have less ductility which is the amount of plastic deformation (permanent stretch) that occurs between yield and ultimate failure. But the shear strength, which is proportional to tensile, is higher for grade 8 vs grade 5, for the same size bolt. Grade 8 is heat treated after cold forming to give the strength, whereas grade 5 is just stronger due to cold forming. The ductility is not brittleness, they're different properties that are sometimes used as interchagable but should not be.

Just some info from a metallurgical engr (me). I would use grade 8 for that application.
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