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Old 11-11-2012, 06:03 PM   #3391
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Quote:
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This remanufactured thing came up before. I asked my service manager why the new part numbers start with RL, which people were saying meant "remanufactured"

He said the head replacement parts are all new and the "RL" meant return core to chrysler. Not sure if that still holds true.
Holy crap. I take that back. Someone in this thread with an august build '13 has a head date stamp of 2011.

http://www.wranglerforum.com/f33/doe...ml#post2983090

I would say that's pretty strong evidence they're now re-using old returned head cores with new valve parts. In production builds....

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Old 11-11-2012, 06:30 PM   #3392
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I have confirmed that I have the "A" version of the header on the driver side. Was there ticking in every head or just some? I here mine tick but it isnt like whet the other online videos are showing.

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Old 11-11-2012, 07:49 PM   #3393
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Quote:
Originally Posted by Blastek View Post
Holy crap. I take that back. Someone in this thread with an august build '13 has a head date stamp of 2011.

http://www.wranglerforum.com/f33/doe...ml#post2983090

I would say that's pretty strong evidence they're now re-using old returned head cores with new valve parts. In production builds....
I wonder if they have the sequence backwards, the last digit is normally the letter. So 1952A would be mid July 2012 head build for an Aug 2012 built Jeep.
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Old 11-11-2012, 09:05 PM   #3394
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Holy crap. I take that back. Someone in this thread with an august build '13 has a head date stamp of 2011.

http://www.wranglerforum.com/f33/doe...ml#post2983090

I would say that's pretty strong evidence they're now re-using old returned head cores with new valve parts. In production builds....

If that's the case it would really suck. Isn't there a law against using re-manufactured parts in a brand spanking new vehicle? I could see them getting away with it to resolve the ticking issue, but not a vehicle fresh off the line.
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Old 11-11-2012, 09:40 PM   #3395
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Quote:
Originally Posted by demarpaint View Post
if that's the case it would really suck. Isn't there a law against using re-manufactured parts in a brand spanking new vehicle? I could see them getting away with it to resolve the ticking issue, but not a vehicle fresh off the line.
x2.
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Old 11-11-2012, 11:01 PM   #3396
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Originally Posted by Blastek View Post
Holy crap. I take that back. Someone in this thread with an august build '13 has a head date stamp of 2011.

http://www.wranglerforum.com/f33/doe...ml#post2983090

I would say that's pretty strong evidence they're now re-using old returned head cores with new valve parts. In production builds....
Honestly I think he's just reading the numbers backwards, the stamping numbers he posted make more sense if you flip them around. I too was reading the numbers on my ds head through a mirror today and had difficulty trying to figure out the correct orientation.
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Old 11-11-2012, 11:10 PM   #3397
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Where do you find a engine build date?
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Old 11-11-2012, 11:15 PM   #3398
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Where do you find a engine build date?
Engine build date is written by hand right under the crank pulley

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Old 11-12-2012, 06:38 AM   #3399
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Here is mine...

02/04/2012
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Old 11-12-2012, 06:44 AM   #3400
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Originally Posted by jaybretzke
Here is mine...

02/04/2012
That means yours was built on 204th day of 2012
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Old 11-12-2012, 07:07 AM   #3401
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That means yours was built on 204th day of 2012
considering mine is 06062012 mine must have been built in the future. I bet they got the ticking problem fixed by then. it actually is written 20120606 on mine and my jeep was born on 08302012. my heads are 231st day of 2012 by thier julian date.
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Old 11-12-2012, 07:09 AM   #3402
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Quote:
Originally Posted by jadmt

considering mine is 06062012 mine must have been built in the future. I bet they got the ticking problem fixed by then.
Sorry. I thought part of the number was a Julian date. Unless of course Chrysler has built a time machine......
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Old 11-12-2012, 12:54 PM   #3403
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The engine serial # is located on the left(driver) side of the block at the transmission flange. It is not hand written. It is difficult to see in the Jeep.
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Old 11-12-2012, 12:56 PM   #3404
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I believe the handwritten number is placed there after an inspector eyeballs the engine.
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Old 11-12-2012, 01:10 PM   #3405
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I thought I read somewhere on this site or perhaps another that it was just indicating when the block itself passed inspection.
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Old 11-12-2012, 01:35 PM   #3406
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I wonder if they have the sequence backwards, the last digit is normally the letter. So 1952A would be mid July 2012 head build for an Aug 2012 built Jeep.
True, I think you're right. Too much coincidence.

I think all the handwritten notes are per part inspections. That could just be the oil pan. I pulled the dash panel off and there's a hand written note underneath that part too.
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Old 11-12-2012, 01:54 PM   #3407
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Quote:
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That means yours was built on 204th day of 2012
That's probably a M-Date ... meaning manufacturing date. We've used this for decades.
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Old 11-12-2012, 03:34 PM   #3408
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read on another forum that jeep is announcing in the next week or so that heads will be made by mack in the USA.
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Old 11-12-2012, 04:49 PM   #3409
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They are hand writing the dates on engines with sharpies because the computer imprinted numbers are, what??????????? They're tracking something that the different part manufactures cannot track once the engine is assembled...
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Old 11-12-2012, 05:05 PM   #3410
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Yeah, there's something up with the handwritten numbers.....
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Old 11-12-2012, 05:16 PM   #3411
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They are hand writing the dates on engines with sharpies because the computer imprinted numbers are, what??????????? They're tracking something that the different part manufactures cannot track once the engine is assembled...
To my knowledge, the major parts like the block and heads get numbers machined onto them. Once they are assembled, a human does a QA/QC inspection and then hand writes the date.

Every notice the marks in different colors on various areas of your Jeep? Like someone used a paint marker? Same thing; mark left by an inspector.
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Old 11-12-2012, 05:23 PM   #3412
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They are hand writing the dates on engines with sharpies because the computer imprinted numbers are, what??????????? They're tracking something that the different part manufactures cannot track once the engine is assembled...
The engine S/N is easy to see when the engine is out of the Jeep, difficult to see in the Jeep. Parts are scanned in assembly before installation and logged into a computer record for each Jeep.
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Old 11-12-2012, 05:32 PM   #3413
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Has it ever been reported what the root cause of this problem is??

All I could find was this: “Chrysler Group discovered an anomaly that may affect 0.5 per cent of Pentastar engines, but only if those engines are subject to a rare set of conditions".

What is the anomaly?
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Old 11-12-2012, 06:06 PM   #3414
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That means yours was built on 204th day of 2012
It cant be a julian date since the engine would have been built after I bought the jeep. I am sticking with 02/04/2012.

Does anyone know what head I should have. AA/AB/AC?

Just curious if we have narrowed down the dates yet.


Thanks
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Old 11-12-2012, 06:13 PM   #3415
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We need to delete this thread and sticky a new thread with a continuously updated first post.

look at the driver side valve cover from the fender near the brake booster. Right at the bottom of the head just above the exhaust there is a metal stamp. Its behind the steering column. The first line is the build date in julian. 2062 and higher (the trailing 2 is the year) is an AC head.
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Old 11-12-2012, 08:22 PM   #3416
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Quote:
Originally Posted by jaybretzke View Post
It cant be a julian date since the engine would have been built after I bought the jeep. I am sticking with 02/04/2012.

Does anyone know what head I should have. AA/AB/AC?

Just curious if we have narrowed down the dates yet.


Thanks
Post # 3415 shows where to find the head date. It isn't a handwritten date.
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Old 11-12-2012, 09:32 PM   #3417
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Hey guys, brand new here. I'm considering buying a 2012 JKUS and came across this issue. My situaton is more complicated as I'll be buying the vehicle in Korea, as I'm working there (connected to the US military). Though I can get warranty service there, I'd rather not of course.

Based on post 3415, it's safe to assume the Jeep doesn't have an AC head, but how can I determine if it has an AB or an AA?


I guess another good question was, if you were in my position, would you just pass on the vehicle on the whole and get something else? I'm really stumped.

Thanks.
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Old 11-12-2012, 09:45 PM   #3418
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Hey guys, brand new here. I'm considering buying a 2012 JKUS and came across this issue. My situaton is more complicated as I'll be buying the vehicle in Korea, as I'm working there (connected to the US military). Though I can get warranty service there, I'd rather not of course.

Based on post 3415, it's safe to assume the Jeep doesn't have an AC head, but how can I determine if it has an AB or an AA?


I guess another good question was, if you were in my position, would you just pass on the vehicle on the whole and get something else? I'm really stumped.

Thanks.
Welcome Aboard!
Check the number and if its 2062 or higher, it has the AC head. Anything lower (earlier) means AB head. You don't want that.
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Old 11-12-2012, 09:50 PM   #3419
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Welcome Aboard!
Check the number and if its 2062 or higher, it has the AC head. Anything lower (earlier) means AB head. You don't want that.
Not necessarily, supposedly there haven't been any problems (yet) with the AB heads and the valve issues.
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Old 11-12-2012, 10:24 PM   #3420
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Not necessarily, supposedly there haven't been any problems (yet) with the AB heads and the valve issues.

Right, that's what I've read and learned from this thread (I actually did my homework before asking). But, similar to the 2062 number between AB and AC, is there one between AA and AB?

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