1. 2016 PM sensor water shield addition in Horizontal Side-Out (ISB and ISX applications) and Vertical End-Out (ISB applications Only) SCR
11/30/2015

2. Description and Reason for change
The water shield on top of the System-Out NOx Sensing Wheel in ISB and ISX SCR Aftertreatment Systems will be changed to accommodate integration of the PM sensor for 2016.
This change applies to Horizontal side-out SCRs for ISB and ISX Applications as well as Vertical end-out SCRs for ISB Applications
The water shield on top of the System-Out NOx Sensing Wheel will make the PM Sensors more robust against water intrusion.
TLA part numbers will not change.

3. Detailed Description – Water shield for PM sensor
The water shield on the NOx Sensing Wheel has been revised
Applies to the Outlet of the following configurations
Horizontal Side-Out SCRs
ISB and ISX applications
Vertical End-Out SCRs.
ISB Application Only
Impact on system back pressure due to the addition of water shield is being evaluated
Nox Water Shield
PM & Nox Water Shield

4. Design Change Illustration
Horizontal Side out
Vertical End Out
Current Design ISX
New Design ISX
Current Design ISB
New Design ISB
Current Design ISB
New Design ISB

5. Impact to OEM
Water shield implementation is expected to have minimal impact on the following
Engine Performance
Fuel Economy
Existing Pressure Drop IQA Results
Potential temporary change to tailpipe insertion depth in MR/HD SCR Side-Out
See slide 6 for details

6. Impact to OEM cont.
Depth of insertion dimension called out in SCR Side-Out Outlet tubes is currently 55 mm
proposed to change to 50 mm temporarily for the SCR part numbers listed:
Affected SCR part numbers: A052X521, A053C171, A050G181, A052Z240, A052Z237, A052Z241, A052X406, A052Z234, A052Z244; A052Z239, A050G165, A050G091, A050G054, A050G118, A050G124, A050N496, A050N506, A053F434; A050G169
The tailpipe insertion depth will be 5 mm less. Will this decrease in insertion depth be acceptable temporarily (until February 1st, 2016) for the part numbers listed above?
Note: This image is for 5”, but the proposed dimension applies to both 4” and 5”