Cummins ISX11.9 CM2250 – Service Manual 011-079   Aftertreatment Intake NOx Sensor Bracket

CAUTION  The NOx sensor will stay hot to touch for long periods of time after the engine has been switched off. The NOx sensor will also be hot if the engine keyswitch is ON.

CAUTION  Do not underseal or coat/paint any part of the NOx sensor.

CAUTION  Wear goggles and protective clothing to reduce the possibility of personal injury.

The aftertreatment intake NOx sensor bracket is located in on the engine block just below the aftertreatment adapter pipe.

The aftertreatment intake NOx sensor bracket is made up of two pieces.  One piece attaches directly to the engine block and the second piece is a vibration isolated plate where the small aftertreatment intake NOx sensor module is mounted.

The aftertreatment intake NOx sensor is a one-piece unit made up of two parts. It is a small module with a wire connection to the metal sensor body that sits in the exhaust system. The parts must not be separated.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the aftertreatment intake NOx sensor module. Refer to Procedure 019-463 in Section 19.

Remove the two retaining capscrews of the aftertreatment intake NOx sensor bracket.

If necessary, remove the three retaining capscrews of the plate where the aftertreatment intake NOx sensor mounts.

Inspect the bracket for cracks or other damage.

If cracks or other damage are found, replace the bracket.

Inspect the vibration isolators of the mounting plate for cracks or tears.

If cracks or tears are found, replace the vibration isolators.

If the vibration isolators need to be replaced, apply a small amount of Lubriplate™ or vegetable oil to lubricate the rubber grommet and the lip of the metal shaft.

Insert the self contained bolt, vibration isolator, and shaft into the mounting hole in the plate.  Install the other piece of the vibration isolator onto the shaft.

NOTE: Make sure the lip of the vibration isolator is facing toward the plate.

Start part of the vibration isolator over the lip of the shaft.

Rotate the vibration isolator while pushing toward the plate.

Make sure, when installing the vibration isolator, that it is fully installed over the lip of the shaft.

Attach the plate to the bracket using the three vibration isolated mounting capscrews.

Tighten the three vibration isolated mounting capscrews.

Attach the bracket to the engine block using the the two mounting capscrews.

Tighten the two mounting capscrews.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the aftertreatment intake NOx sensor module. Refer to Procedure 019-463 in Section 19.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for proper operation.