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04-25-2022, 03:31 PM | #1 |
Senior Member
Join Date: Mar 2011
Location: W. Mich.
Posts: 471
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Intake Manifold Crack
I changed the carb on our 39 this afternoon & found a crack in the carb mounting surface. Not knowing the inner structure of the manifold, do you think this could be a problem? I'm thinking not.
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04-25-2022, 03:48 PM | #2 |
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Join Date: Oct 2014
Location: NE Iowa
Posts: 1,664
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Re: Intake Manifold Crack
Almost looks like a witness mark from a gasket for lack of a better explanation. Nice looking harness and wire harness btw.
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04-25-2022, 04:42 PM | #3 |
Senior Member
Join Date: Mar 2011
Location: W. Mich.
Posts: 471
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Re: Intake Manifold Crack
Thanks. It is a crack. I sanded the surface after scraping the old gasket off. I can feel it with my fingers.
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04-25-2022, 05:30 PM | #4 |
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Join Date: May 2010
Location: Santee, California
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Re: Intake Manifold Crack
Not an issue.
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04-25-2022, 05:54 PM | #5 |
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Join Date: May 2010
Posts: 2,173
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Re: Intake Manifold Crack
You call that a crack? This is a crack.
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04-25-2022, 05:59 PM | #6 |
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Location: W. Mich.
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Re: Intake Manifold Crack
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04-26-2022, 04:27 AM | #7 |
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Location: Southern France
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Re: Intake Manifold Crack
A quick check with a vacuum gauge will verify if its an issue.
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04-26-2022, 05:59 AM | #8 |
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Join Date: May 2010
Posts: 4,743
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Re: Intake Manifold Crack
The other side of the crack is the exhaust port. Exhaust is circulated through the intake to warm the intake and the fuel that flows through. 39 intake should not be too hard to find.
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04-26-2022, 07:50 AM | #9 |
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Join Date: May 2013
Location: Pa.
Posts: 2,163
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Re: Intake Manifold Crack
Not an issue X2. Several reasons it’s not. The crack doesn’t break out at the fuel intake ports or the edge of seating surface, so even if it does enter the surface deep enough to break into exhaust as Terry,OH speaks of the carb gasket will seal. If your a belt and suspenders guy like me, I’d put a thin layer of high temp RTV on it & install / tighten gasket & carb while wet & let cure. No potential for any leakage of exhaust or vacuum & an invisible fix.
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04-26-2022, 03:18 PM | #10 |
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Join Date: Apr 2019
Location: Keizer, Oregon
Posts: 29
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Re: Intake Manifold Crack
You might try the wicking Loctite like is used for weld porosity.
LOCTITE® Letter Grade AA(089)Wicking Grade High Strength Threadlocker is used to lock and seal fine threaded nuts, bolts, and studs in a wide variety of applications . It is also used to seal porosity in welds, castings, cracks and powdered metal parts. |
04-26-2022, 03:59 PM | #11 | |
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Join Date: May 2010
Location: Napa,California
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Re: Intake Manifold Crack
Quote:
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04-26-2022, 07:19 PM | #12 |
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Join Date: Sep 2016
Location: sydney australia
Posts: 1,029
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Re: Intake Manifold Crack
very gently drill the ends of the crack this will stop it running 1/16 th is plenty then either weld it shut or fill with metal putty or just leave it alone until it becomes a nuisance
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