Is this manifold cracked? Also a pretty bad weld job. - Jeep Wrangler Forum
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Old 06-07-2013, 04:07 PM   #1
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Is this manifold cracked? Also a pretty bad weld job.

Got around to doing an oil change and swapping my spark plugs today. While underneath I decided to look around the manifold to check to see if its cracked since I've read a lot about how prone these are to cracking. I've got some tapping noise that sounds similar to some of what I've heard in other peoples videos and I'm not sure if its in the engine or from a cracked manifold. Best why I can describe it is a quick tapping sound, definitely sounds louder when I got down down on the ground near the tire - when up around the hood/engine area it is a little quieter and seems to be a little louder on the drivers side than the passengers side (which is the side of the tube in the pics below).

These are the only two pictures I snapped while down there, thought they'd be good enough but now that I look at them on the comp I'm not sure. It looks like a crease but I'm not really sure how these are supposed to look.







In addition to that, I found something nice that I somehow missed when checking out the Jeep originally.

Not that I can actually weld, but this looks to be a pretty bad job. The bracket is re-welded onto the axle, which I can only assume means it was broken off at some point. Should I be worried about my safety? I've got no knowledge or experience dealing with anything related to this and am a little concerned about it. Anything else I should specifically check? I intend to install a DPG Ultimate Kit and get some 33s in the next month or two.




Final thing - this is the first time I've ever done spark plugs on any vehicle. Here is a pic of the used plugs, they look pretty bad to me but I've never pulled plugs before and don't really know what used plugs should look like.




Appreciate any feedback you guys can provide...

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Old 06-08-2013, 12:53 PM   #2
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Your first issue is ► what were looking at is referred to as a Down Pipe, not the
Manifold. That very well could, and most likely IS a Crack. Small issue, any Muffler
Shop can Weld that closed for a couple of dollars.

Second issue is NOT SO MINOR. That item is the, or one of the Track Arm mounting
Brackets including the Shock Mounting Perch. Your assumption that this area has failed sometime in the Past, is more than likely CORRECT.
THE BAD NEWS IS → The DPG Ultimate Kit your considering to install, WILL NOT
correct this damage in it's self. The Weld looks to be what is referred to as a
COLD WELD. NO PENETRATION to speak of, meaning it's weak, and most definitely
pron to future FAILURE. Depending on WHO installs the DPG KIT, they may have
the means to repair that damage, IF NOT------ seek out a Frame Repair Shop.

Your third issue really appears to be NO ISSUE AT ALL. Your Plugs appear to show
good Engine Tune / Air Fuel Mixture. NOT LEAN, nor RICH, good compression, no excessive
Oil consumption. THAT being said, it is only what a visual inspection of the Plugs appear
to be indicating, and may not necessarily be 100% correct.

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Old 06-08-2013, 01:58 PM   #3
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That does not appear to be a crack, looks more like the edge of a reinforcement layer at the bend of the pipe. Cracks do not have a clean edge like that
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Old 06-08-2013, 02:08 PM   #4
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Thanks - obviously biggest concern is the mount and was pretty confident that it was a pretty bad situation to be in.
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Old 06-08-2013, 03:58 PM   #5
Knows a couple things...

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No need to go to a frame repair shop to fix that weld, any competent welder or welding shop can take care of it in no time. Most 4x4 shops have at least one competent welder on staff too, I'd go to one of them first as they are more used to repairing where the control arm bracket is welded to the axle... a fairly common issue.
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