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Old 10-26-2012, 06:36 PM   #3181
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Quote:
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Whew! Julian date 2072 on my drivers side head. Made it by one day. My block has a Julian date of 2062 so I think I must have just barely made it.
cool stuff, so now we can tell what our head build dates are!

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Old 10-26-2012, 06:50 PM   #3182
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Originally Posted by Blastek

cool stuff, so now we can tell what our head build dates are!
Yeah. It's tough to spot though as it is partially obscured by an electrical connector. Rest your chin on the fender just ahead of the master cylinder, shine some indirect light just below that connector and you should see it. There are three rows of numbers. The Julian date is the top row.

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Old 10-26-2012, 08:05 PM   #3183
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Yeah. It's tough to spot though as it is partially obscured by an electrical connector. Rest your chin on the fender just ahead of the master cylinder, shine some indirect light just below that connector and you should see it. There are three rows of numbers. The Julian date is the top row.
Thanks for the pointer. I wouldn't have seen it without your tip. I tried to see the passenger side from the top and underneath, but it looks impossible without removing the battery shroud.

mine is 217, august 5th, which is an AC head as expected. so the AB head only really lasted from late june to July 25th.
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Old 10-26-2012, 08:16 PM   #3184
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that's not a cylinder head part number. edit: that's your coolant
I looked over my receipt again.


RL141353AC
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Old 10-26-2012, 08:23 PM   #3185
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Just for reference the two connectors in Blastek's pic (one black, one white) are for the driver's side oxygen sensors.
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Old 10-26-2012, 09:32 PM   #3186
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So, finally we find out what they did to the head. We also find out the right side head already has an AD revision. Why they aren't replacing both heads is beyond me. From a chrysler tech at jeepforum:

Case Number: S1209000022
Release Date: 10/16/2012
Symptom/Vehicle Issue: Identifying Service Replacement Cylinder Heads
Diagnosis:
3.6L cylinders have been improved for durability by upgrading the valve seat and valve guide material. In order to verify that the latest upgrade is incorporated in to the cylinder head received from service parts verify the part number and Julian build date of the cylinder head
Part Number- RL141353AC or higher - left side head
Part Number -RL141352AD or higher– right side head
And a Julian build date of 2062 (206th of 2012) or higher .The build date is stamped on the outboard side of head at the center just below the rocker cover sealing rail

so it looks like AC heads came around the end of july
So I have an obvious ping, really poor mileage since day 1 but no CEL yet. Julian build date on driver side of 112/2. Really at a lose as to what I should do here....The service manager where I bought the Jeep really had no clue what he was talking about and I am just not having a warm fuzzy about the whole situation.
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Old 10-26-2012, 09:39 PM   #3187
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So I have an obvious ping, really poor mileage since day 1 but no CEL yet. Julian build date on driver side of 112/2. Really at a lose as to what I should do here....The service manager where I bought the Jeep really had no clue what he was talking about and I am just not having a warm fuzzy about the whole situation.
ping or a tick? because those are two separate issues. first, if you have a definite tick, you can get the head replaced. they will pull the valve cover and check for anything out of spec.

second, are there any other dealers in your area? because you don't really want to be the first one to get a head replaced. especially if they're not aware of the problem.
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Old 10-26-2012, 09:44 PM   #3188
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Yeah. It's tough to spot though as it is partially obscured by an electrical connector. Rest your chin on the fender just ahead of the master cylinder, shine some indirect light just below that connector and you should see it. There are three rows of numbers. The Julian date is the top row.
Mine says 1762A. So that means Jun 25th, 2012.

Well, I don't have any issues yet at 5K miles. I guess we will see.
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Old 10-26-2012, 10:00 PM   #3189
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ping or a tick? because those are two separate issues. first, if you have a definite tick, you can get the head replaced. they will pull the valve cover and check for anything out of spec.

second, are there any other dealers in your area? because you don't really want to be the first one to get a head replaced. especially if they're not aware of the problem.
Im sorry, wrong terminology Tick would be the right word. I posted a youtube link a couple pages back. There are 2 other dealer that are actually closer, one of which I refuse to go to (the closest actually) due to previous issues with their service department. Long story short, they refused warranty work without even contacting Chrysler, and then returned my jeep to me not fully put back together. The one I went to and bought from have changed a couple heads however as I previously posted he seemed to have no idea what he was talking about in reference to the head problem.

I think I may have to go talk to the other dealer in the area tomorrow and see what they say. I called the service manager this morning and left a msg and never got a call back. My wife is deployed right now and with two kids, major inspection at work starting next week, and a destroyed house I just dont have time to deal with this shit
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Old 10-26-2012, 11:05 PM   #3190
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Aug 27th head date. Sept 12th build date. 1000mi on the clock and she's holding fast....
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Old 10-26-2012, 11:38 PM   #3191
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my aug build has a 2312 stamp so I think that is august 18th or 19th depending on leap year. Well at least it should be fairly up to date lol
I might add that my engine build date is the same 2312
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Old 10-27-2012, 05:41 AM   #3192
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my aug build has a 2312 stamp so I think that is august 18th or 19th depending on leap year. Well at least it should be fairly up to date lol
I might add that my engine build date is the same 2312


mine is also 2312
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Old 10-27-2012, 06:36 AM   #3193
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Aug 27th head date. Sept 14th build date. 1000mi on the clock and she's holding fast....
My wife uses this jeep as a daily driver so if there's a defect she will find it....
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Old 10-27-2012, 07:47 AM   #3194
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cool stuff, so now we can tell what our head build dates are!
This will turn out to be a really good shopping tool. Cant wait until a salesman asks me what I'm doing when looking for the build date.
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Old 10-27-2012, 08:08 AM   #3195
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Got mine back yesterday at the end of the day. The seat was fixed. My engine cover looked dirty- probably swapped mine out. I got in to start her up and leaned my head out the door. I heard a clicking (wtf?). I must have bumped the blinker. The engine purred like an angry kitten. Sounded better than day 1. My mileage indicator was up from 16 to 19.
Btw I never mentioned the word "head." The order said the code indicated a #2 misfire (insert joke). The guy told me a new head would have cost about 3800-4200 had it not been covered.
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Old 10-27-2012, 08:26 AM   #3196
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Having experienced a cylinder head issue with another brand of automaker, not notifying customers is just piss poor business.

In my case it took about a year for the automaker to fully grasp the nature of the problem but they then sent a letter to all owners who might possibly be affected.

The letter described the symptoms, the cause, AND extended the 36mo/36K mile powertrain warranty to 7 yrs/100K miles.

IMO, Chrysler could do the same (if they wanted too).
Agreed, but I think Chrysler's accountants are sparing themselves the cost of replacing the heads on every engine involved, hoping they only have to replace the ones with the CEL and/or only customers that complain hoping most will just pass it off as normal or never know the damn difference thus never bringing it in for the issue...
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Old 10-27-2012, 08:39 AM   #3197
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Got mine back yesterday at the end of the day. The seat was fixed. My engine cover looked dirty- probably swapped mine out. I got in to start her up and leaned my head out the door. I heard a clicking (wtf?). I must have bumped the blinker. The engine purred like an angry kitten. Sounded better than day 1. My mileage indicator was up from 16 to 19.
Btw I never mentioned the word "head." The order said the code indicated a #2 misfire (insert joke). The guy told me a new head would have cost about 3800-4200 had it not been covered.
So some rough figures would be that this head issue has cost Chrysler well over 12 million at this point. I'd hate to be the guy that designed the head.
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Old 10-27-2012, 09:00 AM   #3198
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Which is why I fail to understand why some folks don't seem to take this seriously about the problem popping up beyond warranty periods. I don't know about you but I don't have an extra $4k laying around in this depression economy. If you do and don't care then I'd say congrats to you.
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Old 10-27-2012, 09:04 AM   #3199
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have there been reported issues with other vehicles with this engine reported...or is it a jeep issue ? I'm sure that was covered in some of these 107 pages but with this many people having so many problems,i don't have the patience to read it all. lol.
Am just waiting patiently for the lifters my dealer ordered to install them next week or so,and see how long it takes for them to start ticking again.Then all hell will break loose here.Postal will be a understatement .
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Old 10-27-2012, 09:08 AM   #3200
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Which is why I fail to understand why some folks don't seem to take this seriously about the problem popping up beyond warranty periods. I don't know about you but I don't have an extra $4k laying around in this depression economy. If you do and don't care then I'd say congrats to you.
I don't care, and I'll tell you why. Mine doesn't have a problem, and if it did, I'd go get it taken care of.

Oh, wait, maybe I should just go banging down Chrysler's door screaming I want the new head on my Jeep because I've heard of a few problems on an internet forum.
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Old 10-27-2012, 09:36 AM   #3201
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So some rough figures would be that this head issue has cost Chrysler well over 12 million at this point. I'd hate to be the guy that designed the head.
Well I think we've learned now that it is not a "design" problem but a materials or materials processing (specifically metallurgical) problem. I take that as good news... we now know the design is basically sound.
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Old 10-27-2012, 09:40 AM   #3202
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Well I think we've learned now that it is not a "design" problem but a materials or materials processing (specifically metallurgical) problem. I take that as good news... we now know the design is basically sound.

Actually, that still makes it design problem, because an engineer is suppose to consider the materials he specifies in his design with regard to using them properly. So if the materials fail, the design fails.
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Old 10-27-2012, 09:41 AM   #3203
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Having the head issue happen after the warranty expires is a legitimate concern. Some folks don't have an extra $4K to spend on a new head.

But unless Chrysler steps up and extends the warranty......
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Old 10-27-2012, 10:04 AM   #3204
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Having the head issue happen after the warranty expires is a legitimate concern. Some folks don't have an extra $4K to spend on a new head.

But unless Chrysler steps up and extends the warranty......
I would think that the problem would show up long before 5yrs or 100,000 miles. If and most likely so, and they can't keep it fixed, then they're still stuck with the responsibility.
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Old 10-27-2012, 10:07 AM   #3205
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I head the issue come up two days ago at 18,500 miles. Jeep goes in Monday for new heads and valve guides
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Old 10-27-2012, 11:00 AM   #3206
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I would think that the problem would show up long before 5yrs or 100,000 miles. If and most likely so, and they can't keep it fixed, then they're still stuck with the responsibility.
I drive a company vehicle and I'm allowed to take it home so my vehicle only gets about 4 to 5 thousand miles a year put on it. In 5 years I'd only have around 25k or less on it. I know my situation is a bit unique but it would be just my luck that my head would go on day 1826 with only 25k on it.
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Old 10-27-2012, 03:48 PM   #3207
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I drive a company vehicle and I'm allowed to take it home so my vehicle only gets about 4 to 5 thousand miles a year put on it. In 5 years I'd only have around 25k or less on it. I know my situation is a bit unique but it would be just my luck that my head would go on day 1826 with only 25k on it.
If I read your posts correctly you don't have one yet so why bother? Lots of good 3.8's out there. On the other hand regardless of what vehicle you get you could have something go wrong big or small the day after the warranty expires. YOu can however get a life time warranty extension which might ease your mind.
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Old 10-27-2012, 03:52 PM   #3208
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I don't drive a lot of miles myself. I probably average 7,000 miles per year split between 3 vehicles. So this is something that worries me...and buying an extended warranty isn't the answer. That is basically letting Chrysler off the hook on this issue.
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Old 10-27-2012, 04:13 PM   #3209
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With so many pentastar motors in circulation in different vehicles, i would'nt be surprised if one of the aftermarket head companies like AFR or trickflow got on the band wagon and started making aftermarket heads at one point.
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Old 10-27-2012, 04:45 PM   #3210
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I knew about the head issue prior to buying my jeep, it did not stop me. I bought a 2013 but I would have bought a 2012 if I could have gotten a better deal (they offered the same deal on both so a no brainer).

If your engine develops a problem after the warranty runs out use that as an opportunity to put a hemi in it. If you were to be able to poll all 3.6L owners who did not belong to Jeep forums I bet 99% would not have any idea there was a problem. Forums are an incredible tool and resource but I think they tend to over emphasize problems but many times people that have problems tend to seek advise via google and end up getting directed to a particular forum.
I also have to call bs on the dealer that said if it was being paid for by the customer it would be $4200. No way should a head replacement cost that. $1200 maybe but even that is over the top. two minute search pulled up dealer cost on a head, so no freaking way on the replacement cost would have been that much.

Mopar Part RL141352AB ENGINE CYLINDER HEAD
Item# RL141352AB
Dealer price: $397.00
Our price:

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