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/6 exhaust manifold cracked/ how to repair?or replace? #1257290 06/25/12 09:15 PM 06/25/12 09:15 PM
Joined: Jan 2003 Posts: 9,857 Cambridge Idaho RUMBLON OP master
RUMBLON OP master Joined: Jan 2003 Posts: 9,857 Cambridge Idaho	My slant six exhaust manifold has a crack and now an exhaust leak. I am guessing there is no way to weld it? And then I guess I have to find a replacement? Any other way to fix these? RUMBLON

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257291 06/25/12 09:34 PM 06/25/12 09:34 PM
Joined: Jan 2003 Posts: 1,547 Puyallup, Wa. S Steve340 pro stock
Steve340 pro stock S Joined: Jan 2003 Posts: 1,547 Puyallup, Wa.	Sure. They can be welded. You need to find a good shop the specializes in cast iron welding.

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: Steve340] #1257292 06/25/12 09:37 PM 06/25/12 09:37 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	Rock auto Guessed the application... 1975 DODGE D100 PICKUP 3.7L 225cid L6 : Exhaust : Exhaust Manifold DORMAN Part # 674232 Hardware: 2 Studs, 2 Nuts, 1 Heat Riser Spring; Gaskets: 1 Manifold & 1 Flange Includes Gaskets and Hardware (where required) $277.79

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257293 06/25/12 10:15 PM 06/25/12 10:15 PM
Joined: Jun 2006 Posts: 655 Alberta R rustbuckett68 mopar
rustbuckett68 mopar R Joined: Jun 2006 Posts: 655 Alberta	When you replace it, 10 ft.lbs. on the fasteners. This allows for thermal expansion, as in it slides around. If its over tightened, no movement, and it will crack. Check your FSM.

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RodStRace] #1257294 06/26/12 12:01 AM 06/26/12 12:01 AM
Joined: Jan 2003 Posts: 9,857 Cambridge Idaho RUMBLON OP master
RUMBLON OP master Joined: Jan 2003 Posts: 9,857 Cambridge Idaho	Quote: Rock auto Guessed the application... 1975 DODGE D100 PICKUP 3.7L 225cid L6 : Exhaust : Exhaust Manifold DORMAN Part # 674232 Hardware: 2 Studs, 2 Nuts, 1 Heat Riser Spring; Gaskets: 1 Manifold & 1 Flange Includes Gaskets and Hardware (where required) $277.79 John, I know you are made of cash but im into this whole rig for $300.00. There is no way in heck I am paying another three bills for an exhaust manifold. And I did look at that and saw the price. I am sure I can look locally and find one, just was hoping it could be fixed easy. dave

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257295 06/26/12 07:32 AM 06/26/12 07:32 AM
Joined: Jan 2003 Posts: 20,179 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,179 Park Forest, IL	You can try to fix it, but it will crack again. I get a lot of Slants given to me, and probably 2/3 or them have the manifold cracked, usually right next to where the center dump is, between 4 and 5. Some of them are broken in half. "Everybody funny, now you funny too."

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: slantzilla] #1257296 06/26/12 10:03 AM 06/26/12 10:03 AM
Joined: Jun 2005 Posts: 4,041 michigan woods imfixinmopars426 master
imfixinmopars426 master Joined: Jun 2005 Posts: 4,041 michigan woods	Quote: You can try to fix it, but it will crack again. I get a lot of Slants given to me, and probably 2/3 or them have the manifold cracked, usually right next to where the center dump is, between 4 and 5. Some of them are broken in half. i bought new

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257297 06/26/12 02:55 PM 06/26/12 02:55 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	Quote: John, I know you are made of cash but im into this whole rig for $300.00. There is no way in heck I am paying another three bills for an exhaust manifold. And I did look at that and saw the price. I am sure I can look locally and find one, just was hoping it could be fixed easy. dave Yeah, Dave I'm rollin' in it. On some stuff you just gotta spend the money. I've driven my 69 van with an exhaust leak when cold the entire time I've owned it. I've got a 2bbl carb,intake and exhaust to swap on, just haven't done it yet. When it is time to fix it, I'd go with a good used or new. I'd hate to put in all the time and effort to get it all installed properly, then have to do it again.

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RodStRace] #1257298 06/26/12 06:33 PM 06/26/12 06:33 PM
Joined: Jan 2003 Posts: 20,179 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,179 Park Forest, IL	I rarely get one anymore that is good. They normally get stripped off if they are good because people know that the only thing worth any money on a Slant is the manifolds. Carbs are always a crap shoot too because most of them were junk when they were new. "Everybody funny, now you funny too."

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257299 06/26/12 07:11 PM 06/26/12 07:11 PM
Joined: Feb 2003 Posts: 16,146 Mesa, Arizona D dart4forte I Live Here
dart4forte I Live Here D Joined: Feb 2003 Posts: 16,146 Mesa, Arizona	Quote: My slant six exhaust manifold has a crack and now an exhaust leak. I am guessing there is no way to weld it? And then I guess I have to find a replacement? Any other way to fix these? RUMBLON Local guy here in Yakima welds cast iron all the time

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: dart4forte] #1257300 06/26/12 07:33 PM 06/26/12 07:33 PM
Joined: Jan 2003 Posts: 20,179 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,179 Park Forest, IL	Quote: Local guy here in Yakima welds cast iron all the time Welding cast is not the issue. The shape of the manifold and the way it mounts are what keep cracking it. Also, after being welded on they need to be surface milled on the port side to make them flat again. By the time you do all that you're in new manifold money anyway. "Everybody funny, now you funny too."

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: slantzilla] #1257301 06/26/12 07:44 PM 06/26/12 07:44 PM
Joined: Jan 2003 Posts: 2,730 541 slobovia A990 master
A990 master Joined: Jan 2003 Posts: 2,730 541 slobovia	Every cracked /6 and early 273 DS manifold I've seen is missing the brace that gets tossed when the starter is changed.

Re: /6 exhaust manifold cracked/ how to repair?or replace? [Re: RUMBLON] #1257302 06/26/12 08:35 PM 06/26/12 08:35 PM
Joined: Apr 2006 Posts: 334 hickory nc USA S skyhawk61 enthusiast
skyhawk61 enthusiast S Joined: Apr 2006 Posts: 334 hickory nc USA	I don't know where your manifold crack is located, but you might try to patch it with Rutland furnace cement, available for less than 5 bucks at places like Home Depot. I used it to patch the cast iron elbow to exhaust manifold joint--elbow provides manifold heat to the carbs on the ram tubes on a Chrysler 300G with a 413. Sealed the crack, and after 2 years there's still no exhaust leak. The guy who told me about this trick also said that if you tried to use it as a "gasket" between two surfaces, you would have to use brute force or a torch to break the seal. Sounded good enough for me.This stuff is rated up to 2000 degrees; It might not work in your application but it never hurts to try the cheap way first.

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