XK 8 days old (to me) 67k Exhaust Leak - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 14 (permalink) Old 09-26-2012, 10:35 PM Thread Starter
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XK 8 days old (to me) 67k Exhaust Leak

Today I went out to start the Jeep, and let it warm
up for about 5 minutes. When I came out, I could hear
the distinct sound of an exhaust leak! When I opend
the door I could smell fumes in the cab. (8 days old to me)
Warranty only covers internal engine parts.

Took it in today, and they said the exhaust bolts were broken.
Huh? I have a 1999 XJ with the original bolts! Anyway, I ended
up buying an extended warranty plan, and they agreed to fix it
for free. Otherwise would have been $425 out of pocket.

At least I have a 3 year warranty now, so if anything else breaks
it's covered. I figure with an 06 that has 67k, a lot can still go wrong.....

I've never heard of exhaust manifold bolts breaking for no good reason.

2006 XK, 4.7, QT2, Limited, Loaded, Stock, the family truckster. (Sold)

1999 XJ, 4.0, AW4, 4x4, 3" OME lift, 31" Destination M/T's, Quick discos, SYE hack and tap. (sold)

2014 MK (Patriot) Stock, 4wd Freedom Drive 1, 2.4L, 6-Speed auto, the gas getter. (Sold)

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post #2 of 14 (permalink) Old 09-26-2012, 10:53 PM
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Unfortunately, this seems to be pretty common on chryslers newer engines. My jk had a broken bolt at at less than 30k.
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post #3 of 14 (permalink) Old 09-27-2012, 07:27 AM
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Had to have two broken bolts replaced on my 06 as had others on this forum.
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post #4 of 14 (permalink) Old 09-27-2012, 09:02 AM
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Or...whoever owned it before you was screwing with it.

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post #5 of 14 (permalink) Old 09-27-2012, 09:44 AM
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If they were screwing with it, it was because they were trying to fix the exhaust leak it had and they thought tightening it up would help. Not sure why chrysler is having so many of these issues lately.
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post #6 of 14 (permalink) Old 09-27-2012, 10:34 AM
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Quote:
Originally Posted by BADOS View Post
Or...whoever owned it before you was screwing with it.
It has nothing to do with that. My 07 4.7 liter is currently having the same problem with an exhaust leak right off of the drivers side manifold. I found a broken bolt a few weeks ago when I was checked it out. I'm currently at 117,000 and about 2 1/2 years ago I had that manifold off for the same issue. Replaced the gasket and all the manifold bolts then. And since more bolts are broken and the leak is back. Its a common issue.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #7 of 14 (permalink) Old 09-27-2012, 01:57 PM Thread Starter
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So this sounds pretty common. Almost like rear upper shock
bolts on an XJ. So did Chrysler come up with a TSB, and
address the issue? Different bolts, or torque specs? Still waiting
for the dealer to call me saying it's done.

2006 XK, 4.7, QT2, Limited, Loaded, Stock, the family truckster. (Sold)

1999 XJ, 4.0, AW4, 4x4, 3" OME lift, 31" Destination M/T's, Quick discos, SYE hack and tap. (sold)

2014 MK (Patriot) Stock, 4wd Freedom Drive 1, 2.4L, 6-Speed auto, the gas getter. (Sold)

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post #8 of 14 (permalink) Old 09-27-2012, 04:14 PM Thread Starter
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Got it back from the dealer today purring like
a kitten. The service advisor says that manifold
bolts have been breaking since the 50's. This is
the first time I've ever heard of it.

2006 XK, 4.7, QT2, Limited, Loaded, Stock, the family truckster. (Sold)

1999 XJ, 4.0, AW4, 4x4, 3" OME lift, 31" Destination M/T's, Quick discos, SYE hack and tap. (sold)

2014 MK (Patriot) Stock, 4wd Freedom Drive 1, 2.4L, 6-Speed auto, the gas getter. (Sold)

2018 - Latitude Plus - 2.4 - AD1 - 8.4A Nav 3C

2019 - Trailhawk - V6 - 8.4 Nav 4C - Cold Package -
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post #9 of 14 (permalink) Old 09-27-2012, 05:10 PM
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I am sure they have been breaking as long as there have been exhaust manifolds but I personally think I am seeing more of them than in the past. I had a YJ with 150k+ miles and it never had any broken bolts, my XJ had 110k miles and none were broken, my friend had two CJ's and neither had any broken bolts, another buddy had a TJ with over 100k and it didn't have any broken bolts, my ram truck doesn't have any broken bolts.

My jk had two broken bolts at 30-40k. I know several people with Hemi's or 4.7's that have had broken manifold bolts multiple times. I kind of wonder if they are using a lower quality part, chinese steel has a bad rap.

Either way, an exhaust leak is pretty minor, a pain yes but minor.
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post #10 of 14 (permalink) Old 09-27-2012, 08:01 PM
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I had the same thing with my 4.7L. I think it may have to do with a lack of flexibility in the exhaust system design - as everything heats up it stresses the bolts at the manifold. My old 4.0L Cherokee had a manifold leak, and I learned that the newer Cherokee manifolds had expansion joints added to them.

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