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#1 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 315
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Have one with the gas line inlet threads stripped out, anyone ever helicoil?
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#2 |
Senior Member
Join Date: May 2010
Location: Clinton,WA/Whidbey Island
Posts: 4,177
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No, but what type zenith?
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#3 |
Senior Member
Join Date: Sep 2014
Posts: 553
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Those threads are for compression fittings. I’m not sure heli coils are made for a compression fitting to properly work. I don’t think time serts are made for that application either.
I’d look for a replacement top, even if it’s a sidebowl top. I’d rather have comfort in knowing the repair won’t fail in the future with leaks or breaking off. |
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#4 |
Senior Member
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,460
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The inlet thread is standard 1/2-20 thread (same as the strainer), But IMHO there is insufficient metal around it to successfully helicoil...but may be try?... or may be try to extend the threads deeper? So what have you got to loose?. However, I totally agree a replacement upper casting is best.
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#5 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 315
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Thanks, going to try heli coil as I already have so I have nothing to lose,
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#6 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
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#7 |
Senior Member
Join Date: May 2010
Location: Clinton,WA/Whidbey Island
Posts: 4,177
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Article i found in my Library!
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#8 |
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Join Date: Jul 2010
Location: United Kingdom
Posts: 1,460
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#9 |
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Join Date: May 2012
Location: Queensland, Australia
Posts: 10,452
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![]() Cheaper by the Dozen? - Gary WA |
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#10 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,570
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#11 |
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Join Date: Dec 2013
Location: Waxahachie, Texas
Posts: 993
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I did a Heli-coil repair to the fuel inlet threads on a Tillotson and so far, it's doing fine with no leaks. I used a "bottoming" tap instead of a regular tap because there's a danger that the extended pilot tip on a regular tap could get into the compression ball fitting area and cut into it before you got enough good threads cut and perhaps ruining the seal. You could always grind the end off a regular tap to allow you to cut plenty of good threads further down the hole. Since you'll be cutting into cast iron, be sure to take your time, use cutting oil, and check your progress frequently especially at the start to make sure your tap is going squarely into the hole. Good luck!
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#12 |
Member
Join Date: May 2010
Location: Richmond BC
Posts: 57
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Another option may be to use Loctite PC 3967 for stripped threads.
Jeff |
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#13 |
Senior Member
Join Date: Sep 2014
Posts: 553
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As is typically the case, we respond with missing info. I don’t use Tillotson carbs, so my comments apply to the factory issued Zenith carbs.
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#14 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 315
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#15 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,570
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On a side note, a lot of naysayers including some professional authors said this repair either couldn't -or shouldn't be done. Social media is full of people who (IMHO) lack the skills to be able to perform such a task and therefore choose to publicly discourage others (-who unlike them might have those skills) and tell them it can't be done. This thread should be a lesson to everyone, including me that this is bad for the hobby. One of the best pieces of advice I ever heard regarding the craft of Restoration was from an old man (I was probably 7 or 8 years old at the time so everyone was old back then! ![]() |
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#16 | |
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Join Date: Jul 2010
Location: United Kingdom
Posts: 1,460
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#17 |
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Join Date: May 2010
Location: Plano, Texas
Posts: 892
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Great job and great video.
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#18 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 315
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Thanks ! glad you enjoyed!
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#19 |
Senior Member
Join Date: Nov 2010
Location: Lambsburg Va
Posts: 315
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Thanks Brent!!
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#20 |
Senior Member
Join Date: Apr 2021
Location: Central Illinois
Posts: 528
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I have watched every Model A video Randal has on his channel. Some multiple times. I, too, watched his video a couple hours after he posted. Way to go Randall! Keep 'em comin', I get a little smarter every time.
Rob
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