What model years don't have exhaust manifold problems?
Has nissan fixed the faulty exhaust manifolds?
fellowx
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My 2011 SV had the passenger side replaced at 56,000 KM, but that was because of a faulty cat converter, not a cracked manifold.
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I don't know why everyone see's this as Nissan's fault. Tubular manifolds have had this problem for as long as they have existed. Even older cast ones can crack but it happens a bit less. Both my BMW and my Jeep have tubular manifolds and both of them are prone to cracking.
Please stop the fallacy...not all of them will crack. It is a common failure, but it does not mean they all fail. It seems like they all do because its a common thread, but I can assure you everyone would be in awe of how low the total failure rate of manifolds and rear ends actually is (if there were a way to gather it).
If you look at the design of a stock titan manifold with the cat-converter on it and compare it to a set of JBA long tubes you will see the stock manifold's design flaw and why they crack so easily. Also all of the stock manifold photos I've seen were all cracked in the same exact spot that mine cracked in. I've not heard of any cases of a set of JBA long tubes cracking. The titan rear ends are fine as long as you fix the axle vent....
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That's not always true. I did the axle vent mod early on. My passenger side seal failed near the end of my 5/60 powertrain warranty.
The axle vent mod may help reduce the chance of an axle seal leak but I think the original intent of the mod was to eliminate the chance of water getting into the axle should the vent get stuck in the open position.
You're young yet. Time will catch up.
My first set of manifolds failed just under 80,000. One failed in the low 70,000 mile range and I let it go and then the 2nd one failed around 78,xxx so then I brought them in to be replaced all at once under warranty.
You have the upgraded rear diff which was effective on model year 2008 trucks. You may just escape the rear diff problem that us 2004-2007 titan owners had to put up with.
If you make things the same old way you get the same old results.
Since Nissan is making them the same old way, they all will eventually crack. It's not a matter of if, but when.
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They don't make them the same way, they added some additional metal/welds to the crack prone area in 08+ Titans, will this keep them from cracking, who knows. but looking at this thread, 99% of those that has responded with a cracked manifold has a Titan that is 08 or before. Ford also has issues with rear seals, My son has an 04 with 42k miles, he has been through 2 seals already, my 01 had the rear seal go out at round 75k miles
08+ will crack also. Only reason you hear more about pre 08 cracking is because they have higher miles on them.
http://www.titantalk.com/forums/tit...problems-dealer-service/300849-cracked-manifold-2008-titan-dealer-wont-fix.html
Several folks I know also had rear axle seal issues (multiple replacements) on Toyota - both Tacoma and Tundra. I think this whole seal thing has to do with now-outlawed chemicals and methods of production, more than anything. Axle seals on old 9" Fords didn't fail much because back then, rubber was made without as much interference from environmentalist whackos and the epa gestapo. Nowadays, it's just like the Shuttle Columbia disaster - when they made them change the way the foam was manufactured, it started flaking off and hitting the shuttle. Eventually it cost the lives of the Columbia crew. Thankfully, rear axle seal failure on trucks all over the place aren't life threatening.
As for the manifolds, I stand by my earlier statement - it's likely either a cost saving measure (a few ounces of materials times several million manifolds installed across the spectrum of vehicles produced in any given year is a lot of savings), or more likely, similar to my comments on the rubber seals above, it's caused by some change in "approved" chemicals, techniques, or processes for making the product. Although, I'd like to see some comparison of the onset of cats being right behind the manifold on so many cars, and cracking failures of exhaust manifolds, as the two may be connected due to the high heat cycles. My cats routinely hit 1000-1100degF in general driving. That can't be good for the metal close by. When cats were way back down the exhaust system (near the muffler/tailpipe rather than near the engine) I suspect all this heat was focused in other areas, rather than the manifolds.
As for the manifolds, I stand by my earlier statement - it's likely either a cost saving measure (a few ounces of materials times several million manifolds installed across the spectrum of vehicles produced in any given year is a lot of savings), or more likely, similar to my comments on the rubber seals above, it's caused by some change in "approved" chemicals, techniques, or processes for making the product. Although, I'd like to see some comparison of the onset of cats being right behind the manifold on so many cars, and cracking failures of exhaust manifolds, as the two may be connected due to the high heat cycles. My cats routinely hit 1000-1100degF in general driving. That can't be good for the metal close by. When cats were way back down the exhaust system (near the muffler/tailpipe rather than near the engine) I suspect all this heat was focused in other areas, rather than the manifolds.
Dude, you really need to stop this nonsensical mantra of yours. Your personal experience, those of your friends and family, and every thread about cracked manifolds and failed rear ends on this site is still not even close to a proper sample pool to draw any meaningful conclusions from.
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They are still cracking. Mine cracked & are cracked again, my buddies cracked on his 2010. I would guess there are lots of Titans driving around with bad manifolds & the owners don't even know it. This is a small group of people.
What are you trying to do, anyways ?
You are correct. This site is only a small sample of the manifold and differential problems. There are a few other other Titan forums with different members reporting the same. There other car related forums reporting the same and then there are those owners that don't participate on any forums that have the same problems.
What is it you don't get? If a company manufactures a part the same old way without a design change you will get the same old results until such a time that the part is re-designed and made better.
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I thought it was the other way around, where the vent would get stuck closed and therefore the axle couldn't breath thus forcing oil passed the seals?
And of course, a one off bad seal could fail even with a properly setup axle vent.
And if water gets in axle? Prepare for chaos.
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I have an 08 CC. Drivers side cracked right about 90K. That began the bolt on money pit. JBA LT, Cajun B pipes, Vibrant Reso,
Of course with all that airflow I needed Uprev to get the AFR right. Well the T needed to breath thus the CAI. New O2 sensors after the headers, Stop the rake so Bilsteins on all 4 corners, The T has 144K miles on it and runs like a beast. So now I've called Bob at Peak Speed and have the LS2 90mm TB coming. Now I need Trutrac and a Trans. Kit and I'll be set. All because of the Manifolds. I was happy how it was at stock. But once you get Uprev you'll never stop. Just FYI... Oh Rear Axel vent mod, IAT mod
TB bypass mod, Just making this truck better like Nissan will on the 2016 gasser I hope....
Of course with all that airflow I needed Uprev to get the AFR right. Well the T needed to breath thus the CAI. New O2 sensors after the headers, Stop the rake so Bilsteins on all 4 corners, The T has 144K miles on it and runs like a beast. So now I've called Bob at Peak Speed and have the LS2 90mm TB coming. Now I need Trutrac and a Trans. Kit and I'll be set. All because of the Manifolds. I was happy how it was at stock. But once you get Uprev you'll never stop. Just FYI... Oh Rear Axel vent mod, IAT mod
TB bypass mod, Just making this truck better like Nissan will on the 2016 gasser I hope....
JBA long tubes and uprev are gateway mods. They should rename this site Titancrack.
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