C175-20 Locomotive Engine Caterpillar

Nitrogen Oxide Sensor - Replace

Usage:

Note: During installation and handling of the sensor, follow the parameters listed below:

Do not expose the sensor to any fluids
Do not contact the sensing element when power is applied to the sensor. Contact with the sensing element may result in injury. The sensing element is heated to a minimum of 100° C (212° F).
Do not use any lubricant on any part of the sensor other than the threads. Do not use unapproved thread lubricant. Do not apply more anti-seize to new parts. If more anti-seize is necessary for pre-installation, use only nickel based anti-seize or non-metallic anti-seize. Apply anti-seize to the threads only and avoid contaminating the sensor head.
Do not use sensors that have been dropped or have been exposed to other forms of mishandling. Damage to the sensor may have occurred that is not visible.
Ensure that the sensor is securely mounted.

Remove cover plate assemblies to access the NO_x sensor .
Show/hide table

Illustration 1 g06042664
Disconnect harness assembly and disconnect sensor cabling (1).
Use 468-8116 Slotted Socket (22mm) to loosen the sensor.
Remove inlet NO_x sensor probe (2).
Show/hide table

Illustration 2 g06042676
Install NO_x sensor probe. Take precautions to prevent damaging the ceramic sensor element (3) when installing.
Note: During installation, inspection, and handling of the sensor, follow the parameters listed below:
Note: Turn off power supply before disconnecting or connecting the NO_x sensor.
- Inspect harness for damaged wiring
- Inspect for secure connections at all ends of the harness
- Do not contact the sensing element when power is applied to the sensor. Contact with the sensing element may result in injury. The sensing element is heated to a minimum of 100° C (212° F).
- Do not use any lubricant on any part of the sensor other than the threads. Do not use unapproved thread lubricant. Do not apply more anti-seize to new parts. If more anti-seize is necessary for pre-installation, use only nickel based anti-seize or non-metallic anti-seize. Apply anti-seize to the threads only and avoid contaminating the sensor head.
- Do not use sensors that have been dropped or have been exposed to other forms of mishandling. Damage to the sensor may have occurred that is not visible.
- Replace the sensor if damaged or faulty.