ISM, ISMe, and QSM11 – 011-026   EGR Differential Pressure Sensor Tubes

Loosen the EGR differential pressure sensor adapter mounting capscrews, but do not remove. This is so the tubes are not distorted during installation.

Make sure not to cross-connect tubes or a fault code will result.

Apply a light lubricant (CRC 3-36, WD-40, or equivalent) to the tube threads and install the tubes. The lubricant must be applied inside the tube nut, directing the spray on the threads and around the sleeve and flange area.

Tighten the tube nuts.

Position the insulation on the differential pressure sensor tubes so the tube nuts at the venturi connection are covered.

The insulation on the pressure tubes is designed to only cover the bottom portion of the tube which threads into the EGR transfer tube. This location proves to be most effective and prevents heat soaking of the EGR differential pressure sensor.

Tighten the EGR differential pressure sensor adapter mounting capscrews. Refer to Procedure 011-028 in Section 11.

Make sure not to cross-connect tubes or a fault code will result.

Apply a light lubricant (CRC 3-36, WD-40, or equivalent) to the tube threads and install the tubes. The lubricant must be applied inside the tube nut, directing the spray on the threads and around the sleeve and flange area

Tighten the tube nuts at the venturi connections.

Tighten the hose clamps at the differential pressure sensor adapter.

Position the insulation on the differential pressure sensor tubes so that the tube nuts at the venturi connection are covered.

The insulation on the pressure tubes is designed to cover only the bottom portion of the tube which threads into the EGR transfer tube. This is the most effective location and reduces the possibility of heat soaking of the EGR differential pressure sensor.