How To Repair Cracked Exhaust Manifold With Jb Weld

Buy JB Weld ExtremeHeat now! — Purchase JB Weld ExtremeHeat now!

Some of the most difficult to repair parts are the ones that must endure very high temperatures. Sure, the engine block may hit 180-220 degrees, but that is aught compared to the extreme heat suffered past the frazzle, where temps tin hands reach 1,200 degrees on a standard not-loftier-operation engine. Operation engines, such as supercharged or turbocharged application tin get even hotter, to the point of making the headers or manifolds glow red hot. When the engine is shut off, the parts cool fairly speedily, only to exist heated upwards one time again, this rut cycling wreaks havoc on the metal, eventually leading to stress cracks.

Cast atomic number 26 is very difficult to weld, it can exist done, but the repairs are normally quite ugly and they don't concluding very long. A proper cast fe weld require removing the part from service, pre-heating the part to most welding temps, welding the damage, and then slowly bringing the part back to room temperature. Most repair shops don't take the capability of doing this, which is why JB Weld ExtremeHeat is such a popular product for high heat repairs.

What JB Weld ExtremeHeat Tin Fix

Unlike standard JB Weld epoxy, ExtremeHeat is an air cure production designed specifically for high oestrus applications, withstanding upwardly to 2,400 degrees Fahrenheit of continuous heat. This mean that your repair will last fifty-fifty nether farthermost heat conditions. All of that does come with a few caveats, however. JB Weld ExtremeHeat is not an agglutinative like JB Weld epoxy, significant it is non designed to bond ii parts together; it is intended to repair cracks and holes in high estrus parts.

Example number 1 – Your exhaust manifold has developed a stress cleft near a bolt. JB Weld ExtremeHeat is the perfect repair solution.

Example number 2 – The frazzle manifold has divide into ii pieces. JB Weld ExtremeHeat will NOT mend the two parts together, this is a replacement or weld repair situation.

This cylinder caput has a broken ear for the exhaust manifold bolts. This Non repairable with ExtremeHeat. You need <a href="https://www.napaonline.com/en/p/NCB8271?cid=social_blog_112017_JB_Weld_ExtremeHeat" target="_blank" rel="noopener">JB Weld Original</a> for this. — This cylinder head has a broken ear for the exhaust manifold bolts. This NOT repairable with ExtremeHeat. Yous need JB Weld Original for this.

How to utilize JB Weld ExtremeHeat

Using JB Weld ExtremeHeat is easy, just iv chief steps tin become yous dorsum on the road.

We had a poorly welded section of exhaust tubing in the shop. It leaks pretty bad. While we could weld it, if you don't have a welder ExtremeHeat can take car of it. — We had a poorly welded section of exhaust tubing in the shop. Information technology leaks pretty bad. While nosotros could weld it, if you don't accept a welder ExtremeHeat can accept machine of it.

Prep – Similar any bonded repair, the surface must be clean, very clean. Any droppings, dirt, oil , grease or other contaminant volition reduce the efficacy of the repairs. Use a chemical cleaner to remove oil and grease, and sandpaper to clear away droppings and roughen upwards the surface to give JB Weld ExtremeHeat a good seize with teeth on the part. eighty-grit sandpaper is sufficient for this job.

Using a slice of <a href="https://www.napaonline.com/en/p/MMM07447?cid=social_blog_112017_JB_Weld_ExtremeHeat" target="_blank" rel="noopener">Scotch-Brite™</a>, we roughed up the tubing, removing any loses rust and dirt. — Using a piece of Scotch-Brite™, we roughed up the tubing, removing any loses rust and dirt.

It should look clean like this. — Information technology should wait clean like this.

Cracks and holes smaller than ane/8" need to be opened up to a minimum of 1/eight". Instead of prying on the crack, apply a grinder, file, drill scrap, or sandpaper to open up the fissure or hole.

Mix – JB Weld ExtremeHeat is a single-component putty, open the container and mix it upwardly well until it is a uniform color and consistency.

The product settles on the shelf, so you have to mix it up pretty good. — The product settles on the shelf, and so you have to mix it upwards pretty practiced.

It should be a consistent color once mixed. — Information technology should be a consistent color once mixed.

Use – Using a spatula, wooden stick or even your finger, utilise the past to the affected area. Work the paste into the pigsty/fissure until it is completely filled. Don't worry about using likewise much, you lot tin can ever sand off the excess subsequently information technology has cured. Holes nowadays a slight trouble as the paste could drip through and create a trivial tail on the other side where you tin't achieve it. If this is the case, attempt working in two stages- brand a smaller base of operations repair, let the paste set, and then come back and add together some more to consummate the repair, keeping the back side of the hole clean.

We scooped up a bit of ExtremeHeat on a metal body filler <a href="https://www.napaonline.com/en/p/SER772000?cid=social_blog_112017_JB_Weld_ExtremeHeat" target="_blank" rel="noopener">spreader</a>. You can put what you don't use back into the jar. — We scooped up a flake of ExtremeHeat on a metal body filler spreader. Yous tin can put what you don't use back into the jar.

The putty was applied to the tubing, pushing it under the gap.

Once spread, we let it rest for a few hours before checking on it. — Once spread, we let it remainder for a few hours before checking on it.

Cure – The cure time of JB Weld ExtremeHeat is two-4 hours for ready, with full cure in 24 hours. It is very important to requite the paste a total 24 hours of cure time before putting the part back into service. You tin test the repair's completion by pushing your fingernail into the repair. If yous nail goes into the repair, information technology is not ready. After the setup time, you lot can speed up the curing process with a non-flame heat source such equally a hair dryer or heat gun.

If you can make an impression with your fingernail, it is not set. — If you tin can brand an impression with your fingernail, it is not set.

Once cured, the repair will be slightly darker than before, and hard as a rock. You can sand it necessary, and even drill and tap JB Weld ExtremeHeat. — One time cured, the repair will be slightly darker than earlier, and hard equally a rock. You can sand it necessary, and even drill and tap JB Weld ExtremeHeat.

JB Weld ExtremeHeat is perfect for making repairs on all manner of loftier-heat parts, including exhaust manifolds, mufflers, catalytic converters, exhaust pipes, engine blocks, fireplaces, smokers/fireboxes, and many more crack-prone items. It works well on steel, fe, copper, stainless steel, and nigh other metals that suffer high rut.

Check out all the chemical products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on how to use JB Weld ExtremeHeat, chat with a knowledgeable good at your local NAPA AUTO PARTS store .

Jefferson Bryant View All

A life-long gearhead, Jefferson Bryant spends more time in the shop than anywhere else. His career began in the machine audio industry as a shop managing director, eventually working his way into a position at Rockford Fosgate equally a product designer. In 2003, he began writing tech manufactures for magazines, and has been working as an automotive journalist ever since. His piece of work has been featured in Auto Craft, Hot Rod, Rod & Custom, Truckin', Mopar Muscle, and many more. Jefferson has also written 4 books and produced countless videos. Jefferson operates Blood-red Clay Rodz, his personal garage studio, where all of his magazine articles and tech videos are produced.