ENGINE GP 5392258 - Caterpillar

Introduction
This Special Instruction outlines the steps needed to handle and install NOx sensors. NOx sensors are used in many different applications. Examples of applications include Clean Emissions Modules (CEM) for off-road applications, and different Selective Catalyst Reduction (SCR) systems used in stationary engine applications.Do not perform any procedure contained in this publication or order any parts until you have read and understand the procedure.Required Parts
Table 1
Part Number and Description Voltage Location
359-9171 Nitrogen Oxide Sensor As 24 VDC Engine Out
359-9172 Nitrogen Oxide Sensor As 24 VDC Tailpipe Out
359-9173 Nitrogen Oxide Sensor As 12 VDC Engine Out
359-9174 Nitrogen Oxide Sensor As 12 VDC Tailpipe Out
441-5127 Nitrogen Oxide Sensor As 24 VDC Engine Out Required Tooling
The table below contains the tooling required to complete this Special Instruction. The following items can be ordered at the address below:http://www.loctite.com/
Table 2
Item Qty Part
T1 1 Loctite® LB 8009(1)
Or
Loctite® Heavy Duty Anti-Seize(2)
(1) For use outside of North America.
(2) For use inside North America.General Handling Procedures
Illustration 1 g03695890
(1) Engine
(2) "Engine out" sensing unit
(3) Emissions Module
(4) "Emissions module out" sensing unit
Do not unplug the NOx sensor cable when the sensor is powered on. Damage to the engine ECM may occur.
Avoid impacting the NOx sensor, dropping the sensor could cause permanent damage. If the sensor is impacted, discard the sensor.
Handle and store the NOx sensor in a clean, dry area that is free of contamination, and inclement weather.
Do not remove the sensing unit protective cap until the sensor is ready for installation.
Do not paint any part of the sensing unit.
Allow the exhaust system to cool before removing the sensor.
Do not clean any part of the sensor with chemical cleaners.
Shipping boxes should be transported and stored in a closed condition. Store sensors in the original closed shipping box until the sensor is ready for installation. The maximum storage time for new sensors in production packaging boxes is 18 months after production. The maximum storage time for sensors in spare part packaging is 2 years after production.
Sensors should be stored in a temperature range of −40° C (−40° F) to 105° C (221° F).
Avoid temperature shock when opening a shipping box. Avoid a temperature difference of more than 5° C (41° F)5° C between the sensors and the environment. Allow at least 4 hours for the sensors to reach ambient temperature before opening the box to avoid condensation on the parts.
Do not open the shipping box with a knife that can deeply penetrate the box. Knives can damage the sensors or sensor cables.Sensor Installation Procedures
Illustration 2 g03695896
(1) Electrical connector
(2) Cable (with varnish tube sleeve)
(3) Grommet
(4) Hex nut
(5) Threads
(6) Protective cover
(7) Mounting tabsNote: Non Metallic anti-seize is the only approved thread lubricant to be used when reinstalling a sensor. See Table 2 for the appropriate anti-seize.Note: The Electronic Control Unit (ECU) consists of electrical connector (1) and mounting tabs (7). The sensing unit consists of grommet (3), hex nut (4), threads (5), and protective cover (6).
Mount the ECU.
Verify that the NOx sensor part number is correct for the application.
Identify the correct mounting boss on the