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| | | | Joined: Oct 2013 Posts: 122 'Bolter | | 'Bolter Joined: Oct 2013 Posts: 122 | The threads in the carburetor body, where the brass fitting for the fuel feed line attaches, are worn out to the point that I am getting a massive fuel leak. Loctite didn't help. Has anyone here ever successfully repaired the threads in the carburetor body? Any suggestions welcome and appreciated. | | | | | Joined: Feb 2000 Posts: 5,228 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,228 | Is there enough material to tap out the hole to the next size pipe? This is how I have done a few.
Joe | | | | | Joined: Aug 2014 Posts: 218 I have more zippers then a pair of cargo pants | | I have more zippers then a pair of cargo pants Joined: Aug 2014 Posts: 218 | have you looked at the "Permatex Stripped Thread Repair Kit"
~ Joe
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Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying. ~ Arthur C. Clarke | | | | | Joined: Feb 2004 Posts: 29,851 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,851 | You haven't mentioned what carburetor you're working with. If it's got a pipe thread and an adapter fitting for the fuel line you can drill and tap the carb body for a reducer bushing and go to the next size larger pipe thread. The Quadrajet-type inlet fitting that also serves as a filter housing is available in an oversize-thread, self tapping version. I've never found a "thread restorer" compound that works well on fuel inlet fittings.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2013 Posts: 122 'Bolter | | 'Bolter Joined: Oct 2013 Posts: 122 | Thanks for the replies Joe, TM2C and Jerry.
The carburetor is a Rochester model "B", for my 216 Stovebolt engine.
Thread is 1/4-17 pipe for the inlet. I believe next size up is 1/2 pipe and I don't think there is enough material on the casting to support a threaded hole that big (would be nice though, allowing me to connect the fuel line without the brass adapter).
I don't believe Helicoil make a pipe thread repair kit (the threads are tapered, so it's hard to guess how that would work). I've heard mixed reviews on the Permatex kit, mostly about the material letting go if the fitting is tightened.
I'm kind of up against it, national VCCA meet is next week. Ain't that always the way. | | | | | Joined: Feb 2004 Posts: 29,851 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,851 | There is a 3/8" pipe tap available, but there might be another approach possible. Get a short 1/4" NPT brass pipe nipple (3/4"-1" long) and thread it into the carb housing with some red Loctite or Marine Tex sealer, then add a 1/4" pipe coupling to thread the inverted flare adapter into. The tapered thread on the pipe nipple should allow you to run it deeper into the carb body than the shoulder on the adapter will allow. It will look a little goofy, but it will probably solve the leak without having to replace the carb.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2013 Posts: 122 'Bolter | | 'Bolter Joined: Oct 2013 Posts: 122 | Jerry, nice suggestion, I'll try to make it thru the show next week then try your fix. I can always add a glass bowl fuel filter and shorten the metal line, adding in a couple of those short pipe nipples, maybe that will be the way to go. | | | | | Joined: Nov 2011 Posts: 1,611 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 1,611 | Bruce,
I may have a core Rochester B from a babbit 235. If you can just swap out the guts I will send it to you.
Paul | | | | | Joined: Oct 2013 Posts: 122 'Bolter | | 'Bolter Joined: Oct 2013 Posts: 122 | Paul, thanks for the generous offer. PM sent. | | | | | Joined: Oct 2008 Posts: 310 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 310 | RE: Longbox55, I stripped mine out many years ago and repaired with a Helicoil insert. Problem solved, tight as a drum. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | David, I have a carb on mine that's been repaired with a Helicoil, too. Mine wasn't pipe thread, though, as I'm running Holleys on it.
Bill Burmeister
| | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | I have a spare carter that has a bushing like HRL described earlier ...pic... My carter has a 1/8 pipe inlet, you posted your Roth has a 1/4 pipe inlet? Is that stock size? | | |
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