Originally Posted by Panhead5
This may be posted somewhere in here but it seems like I've read about a certain build date or serial number for the early 2012 Wrangler head problems .
If it exists what is the date or serial numbers affected before they got it squared away ??
Thanks in advance .
The following was originally posted by xtremzj:
Case Number: S1209000022
Release Date: 10/16/2012
Symptom/Vehicle Issue: Identifying Service Replacement Cylinder Heads
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