I always try to not get anything new the first year it comes out. Let the other people have the problems. My c-phone provider even told me that when I was looking at 4G. I was told to wait at least 6 months, because there's always problems. This engine reminds me of the song "Little red rented rowboat."

 

Ive been told the left head runs hot;and the problem is the valves gall in thier vave guides.
Im treating mine with frequent 6500 rpm passes.
9,900 miles

 

Are any 2013s affected? What exactly is the problem?

Flash

 

The engine has been in production since 2010.... lol

 

LOL owned

 

True, the block has been around a while, but the heads are new to the 2012 Wrangler.

 

I did not realize that the heads were new this year. I knew the engine was around for a while. The heads being new sheds a light on the problem.

 

Have they put new redesigned heads on the 2013s? Anyone know?

Flash

 

My 2013 seems to have the same numbers on the back of the heads, they're really hard to read. Its not even sure if the part number on the back of the head is different on the revision. It seems the was a change around 7/1/2012 according to allpar. There is a hand written date on the front of the block behind the crank pulley. Any date after July 1st would seem to be good to go. There is a 2-4 month lag on the engine date versus the vehicle build date, hence mine is a may build.

 

That's interesting to hear. In all the reading that I did on the Pentastar before I bought my 12, I read nothing about heads that were specific to the Wrangler. I did read about alternator relocation/reversal, but that was it, and I was under the impression that the heads were exactly the same design as the rest of the Pentastars in production.

Note that I'm not arguing with you -- I'm just asking for your source of information because I'm curious to find out more about the Pentastar in the Wrangler and whatever you're reading obviously has more information than I've been able to locate myself.

What are the differences in the Wrangler head from that of the heads on Pentastars in other models? Are there different part numbers for the replacement heads on other models aside from the Wrangler?