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Restoration & Repair Tips Board

small engine question

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mark from the f

09-28-2006 18:49:28




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I have an 8 hp Briggs lawn blower that had the exhaust pipe damaged and has made the 3/4 threaded exhaust hole slightly out of round.
I have re-tapped the threads, but the 3/4 pipe still works itself loose after a couple hours--looking for the next step. Should I apply some loc-tite on exhaust pipe? Do they make pipe taps slightly larger than 3/4"? I'm not real comfortable drilling and re-threading into a 1" hole. Thanks in advance. Mark

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souNdguy

10-04-2006 18:55:49




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 Re: small engine question in reply to mark from the fort, 09-28-2006 18:49:28  
How about get a 3/4 threaded pipe nipple ( thread to thread ) and cut some of the leading threads off, so that the larger taper threads are closer up.. then thread that in, add a coupler, then thread the 3/4 muffler intot he female 3/4 threaded coupler..

If it all fits good, tack weld the muffler to the coupling, and then tack weld the coupler to the threaded nipple.. Might have to torch off the zinc in the spot of the tack.. but no biggie... A file or emory paper or flap disc will do the same..

Soundguy

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SamMI

10-02-2006 04:40:22




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 Re: small engine question in reply to mark from the fort, 09-28-2006 18:49:28  
Had same problem with my 25 yr old 8HP briggs engine. I replaced the threaded version of the muffler with the later style that bolts on. My engine had the two hole in the block making the change easy. HTH



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buckva

09-29-2006 19:33:31




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 Re: small engine question in reply to mark from the fort, 09-28-2006 18:49:28  

had a briggs engine that did the same. Tried the loctite. tried the lockin nut. Finally placed a piece of metal under a head bolt and hose clamped it to the muffler. Now this wasn't pretty but it worked.



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Shovelman

09-29-2006 04:27:59




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 Re: small engine question in reply to mark from the fort, 09-28-2006 18:49:28  
Mark,

Most Loctite threadlockers will release at about 600 degrees F. It won't work very well there.

Do as the Hermit says. Briggs uses the same type of locknut on their mufflers. You could get one from a Briggs source as well.


Good luck,
Scott



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Bob

09-29-2006 08:28:18




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 Re: small engine question in reply to Shovelman, 09-29-2006 04:27:59  
I have used a bit of "furnace cement" as "Loctite" and "filler" on small engine exhaust pipe threads that are worn oversized.

It can "take the heat", and, usually will last a long time.



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Hermit

09-28-2006 19:35:14




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 Re: small engine question in reply to mark from the fort, 09-28-2006 18:49:28  
Use a lock nut like on electrical tubing. Tighten the pipe into the threads then tighten the lock nut.



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