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Old 06-11-2010, 08:41 PM   post #1 of 8
sloweather
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Default Briggs and Stratton muffler bolt hole repair

I have a 12 hp B&S horizontal shaft engine on my used-but-new-to-me DR chipper/shredder.

One of the 5/16" muffler bolt holes is stripped. The head material is aluminum.

What are my options for repairing it? Best? Quickest? Cheapest?

The bolts are custom shoulder bolts so drilling and tapping for a larger bolt is probably not an option without a lathe to make a custom bolt.

Thanks!

Chris
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Old 06-11-2010, 09:24 PM   post #2 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

Something like this might work.

http://www.youtube.com/user/powerstr...89/7rUA48ZAZOg
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Old 06-12-2010, 12:43 AM   post #3 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

You can use the same size thread bolt ,with a steel sleeve on it to match up to the size the shoulder on the original bolt was..hard part is getting the hole drilled in the busted bolt dead center,then tapping it...if any of the broken bolt is still sticking out,you might have luck welding a nut to the "stub" and let it cool,the heat might help it to unscrew..

If that fails you can probably use a pipe thread muffler instead,as the hole in the exhaust port is usually threaded for either 1/2" or 3/4" NPT..
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Old 06-12-2010, 07:27 PM   post #4 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

Thanks for the suggestions. The hole was stripped, not a broken bolt.

There were no NPT threads in the exhaust. I wound up drilling out both holes and installing 5/16" Helicoils. Worked well, and we ran the chipper/shredder for a couple of hours with no problems.
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Old 06-12-2010, 07:52 PM   post #5 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

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Originally Posted by sloweather View Post
Thanks for the suggestions. The hole was stripped, not a broken bolt.

There were no NPT threads in the exhaust. I wound up drilling out both holes and installing 5/16" Helicoils. Worked well, and we ran the chipper/shredder for a couple of hours with no problems.
Helicoils is what I would have suggested. Glad it worked.
I wish I was there. I'd let you take me down to Pismo Beach and get a bowl of clam chowder.
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Old 06-13-2010, 12:36 AM   post #6 of 8
sloweather
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Default Re: Briggs and Stratton muffler bolt hole repair

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Helicoils is what I would have suggested. Glad it worked.
I wish I was there. I'd let you take me down to Pismo Beach and get a bowl of clam chowder.
Don't even have to do that. Splash Cafe has a location in SLO now. Lemmeno when you're coming through.

What part of Utah?
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Old 06-13-2010, 09:39 AM   post #7 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

I'm about 40 miles north of Salt Lake.
When ever I'm in your area Steamers is a must stop for me. I love the view and the clam chowder there.
I hope to do a visit this fall sometime. We have many relatives in California, from Ventura up to Hayward.
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Old 06-13-2010, 09:36 PM   post #8 of 8
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Default Re: Briggs and Stratton muffler bolt hole repair

California clam chowder? Only REAL clam chowda is from Boston!
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