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Unread 04-17-2013, 07:57 AM   #1
mayeni
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1992 XJ Cherokee 
 
Join Date: Feb 2011
Location: kbh, Denmark
Posts: 132
cracked exhaust manifold.

My stock exhaust manifold is cracked right where the two pipes fuse into one, I can't see the hole crack since it is still on the car. The two parts is still close to each other. I have access to a 250 amp CO2 welder, and know how to use it, but I am unsure if it will just crack right next to the welding.
So should I weld it or should I buy a new stainless manifold? Since the new manifold should be shipped to Denmark it will be around 220$.

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Unread 04-17-2013, 08:44 AM   #2
Timo_90xj
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1998 ZJ 
 
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If you MIG weld it, expect the manifold to crack fairly soon again.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 04-17-2013, 09:19 AM   #3
habbyguy
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Use the cracked manifold as an excuse to buy a header. It'll breathe better than the old stock cast iron manifold, plus it weighs less and looks cooler. I've been running an Ebay chrome header for over a year now. It was a nice, cheap mod that probably paid for itself in the first few thousand miles I drove (gas savings).

The design of the original manifold means it'll just crack again if you weld it up.
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Unread 04-17-2013, 09:59 AM   #4
buildin1XJ
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1999 XJ Cherokee 
 
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I agree with not welding and replacing it. Also make certain the condition of your motor mounts and transmission mount as they can be a cause of manifolds cracking due to the design of the exhaust system.
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Unread 04-17-2013, 10:31 AM   #5
mayeni
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I have brought a new one now. My motor mounts looks fine, I checked them very recent, but I don't know about my transmission mount. Would it be an idea to put a flex into the pipe downstream of the manifold.

It is something like this I have in my thoughts.
46964.jpg  
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Unread 04-17-2013, 10:43 AM   #6
buildin1XJ
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I have seen where people have done that. I have also seen somewhere an aftermarket exh man. that has something like that built into it.
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Unread 04-17-2013, 12:14 PM   #7
Timo_90xj
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I put a 3" ID flex tube on my ZJ right after where downpipes from both cylinder banks join. No problems so far.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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