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Offline JD400Texas

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broken exhaust bolt
« on: January 24, 2016, 11:16:41 pm »
I have an echo cs346 that I have owned since new.  Recently the lower exhaust bolt broke and I replaced it along with the exhaust gasket and today it broke again.  Today makes only the second time I have used the saw since I made the repairs.  This bolt broke off flush with the aluminum housing just as the first one did.  I have a hard time believing that I would get a faulty bolt...in the same hole with the same break.

Does anyone have any suggestions as to why both bolts broke in the same manner? 

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Offline srcarr52

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Re: broken exhaust bolt
« Reply #1 on: January 25, 2016, 11:21:00 am »
The bolts are breaking from vibration. You may have to fabricate a muffler support brace on the outside of the muffler to keep the whole muffler from vibrating if it doesn't already have one. Also if they get loose they have a tendency to vibrate and break, a little high temp RTV on the threads will keep them from backing out.
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