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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through December 31, 2011 » Front muffler support bolt broke...twice!!! « Previous Next »

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Griffmeister
Posted on Saturday, November 26, 2011 - 10:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ever since I had to rotate the engine I've had a problem with the front muffler support bolt. They must be breaking cause I used steel lock nuts both times because of proximity to muffler heat, shouldn't be loosening. The only thing I can think of is the muffler to header clamp is not tight enough putting more strain on the support. I reused that clamp and damn if it wasn't tight going back together. I really thought the support should be capable of holding the muffler up regardless. That's two bolts within 1200 miles. Any other ideas?
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Etennuly
Posted on Saturday, November 26, 2011 - 11:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sometimes it helps to loosen all of the bolts holding the muffler and headers, then retighten a little at a time making several passes over each of the bolts or nuts until tight. A little miss alignment can make a lot of pressure on one bolt.
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Xbimmer
Posted on Sunday, November 27, 2011 - 02:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Make sure you're using the tightening sequence as described in the Manual. That being said, I've had two shear off, haven't had an issue since I replaced it with an alloy steel bolt and nylon insert nut from the hardware store. Again, the sequence is important as are the torque values.
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Teeps
Posted on Sunday, November 27, 2011 - 06:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It doesn't hurt to lubricate the head pipe where it slips into the muffler. A good choice is anti seize.
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Griffmeister
Posted on Tuesday, November 29, 2011 - 09:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Xbimmer could have a point.I got the replacement bolt from a NAPA store near me but just assumed that any allen bolt is of a grade better than grade 8.Maybe they are not and I should be looking for something better.
I did follow the manual but everything about the muffler to header connection was a big pain.Probably a good idea to redo that part like everyone says and use a new strap clamp.Thanks all.
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