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#1
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Cracked air horn - repairable?
Picked up complete and unmolested tri-power recently. End carb air horn is cracked at the air filter stud retainer. See attached picture. Can this be welded? What is the material? Any tips on how to weld this. I assume TIG is the way to go. If so, what kind of gas, electrode and filler?
I have included 2 of the carb tags for those who may be interested. The third was damaged beyond recognition. |
#2
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Welded? No. Brazed or silver soldered perhaps.
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The '64 GTO The '65 Chevelle The '69 Chevy Pickup Project The Brazen Orange 2006 GTO |
#3
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Ask the pros: https://www.carhornrestoration.com/
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1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
#4
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Many of the end carbs I restore have the airhorn cracked similar to your picture. I apply JB Weld to the surface of the crack and squeeze the airhorn in a vise to force the crack to close. Wipe off the excess JB Weld and leave it in the vise for at least 12 hours.
Or, you can apply heat carefully to the left and right "beams" (since the zinc melts at a low temperature), while squeezing the top in a vise to force it into position. This closes the crack,. You can apply Super Glue when releasing the vise and squeeze the crack tightly shut, wiping off the excess Super Glue and leaving it in the vise for at least 12 hours. Both these methods have worked for me.. You can buy steel replacements for the air cleaner web if you're not concerned about originality. With the air cleaner in place, the web is not visible. I have not seen a successful solder or weld done to repair these cracks.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
The Following User Says Thank You to Dick Boneske For This Useful Post: | ||
#5
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If you use super glue dust it w baking soda this make it MUCH stronger. In fact some airplane props are field repaired this way by the military it’s so strong.
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#6
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That’s interesting! Please elaborate on the process. Baking soda on part 1st, super glue 1st???
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#7
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Quote:
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#8
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Leave it alone & just install a flat thin rubber washer under the wing nut to hold down & it will not loosen lid.
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#9
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Quote:
Many Tri-Power Rochester 2G & 2GC carbs have the air cleaner web distorted from heat and over-tightening of the wing nut. The cracks prevalent in the front portion of the web, I believe, are a result of overtightening. I thought the comment by turbo69bird was sarcasm, but I did a little research and found that baking powder sprinkled on Super-Glued joints does, indeed increase the strength of the bond. Who knew?
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
#10
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I am totally in agreement with Dick on the no brazing, soldering, or silver soldering.
Have repaired quite a few by compressing out the crack, as Dick mentioned; then drilling and tapping for a 2x56 steel screw for support. Of course, if the owner then uses an 8' cheater bar to tighten the wing nuts, it will break again! Jon
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"Good carburetion is fuelish hot air". "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
#11
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It can be done either way it’s just the chemical reaction between the two that makes it stronger.
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#12
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Add me to the list who agree closing the crack and glue repair is more than adequate and looks good. I use a "super glue", with an activator and a fine filler powder in the kit. Extremely strong and durable. It really is amazing stuff. Have used it on all kinds of repairs. Works especially good on almost all plastics. Interior and exterior hard trim. Obviously, I have found it to work well to repair this common carb issue. www.max1.us
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#13
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Quick question to the experts on this... Would you fix the crack prior to having the casting prepped and re-colored or after?
i.e. if the casting will be lightly glass beaded first. Regards, Joe |
#14
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Prefer to do it after glass bead cleaning. You then, have a clean surface for better adhesion. Then, I have the dichromate done.
Seldom is the repair invisible. I smooth the repaired area with JB Weld, sand it, mask it, and paint the repaired web . I had a local paint shop mix a can of iridescent satin spray that was color-matched to the dichromated carb body. Here are two pictures of repaired end carb webs and two of a center carb before sanding & painting.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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