Centinel System – Repair Manual – 011-026   EGR Differential Pressure Sensor Tubes

• If necessary, remove the EGR differential pressure sensor.
  Refer to Procedure 019-370 in Section 19.

For engines beginning with ESN 14040552, the pressure sensor does
not have to be removed to allow the removal of the EGR differential pressure sensor tubes.

Pressure sensor removal is necessary
only if the sensor adapter is being replaced.
Refer to Procedure 011-028 in Section 11.

Tag the ends of the tubes before removing the sensor tubes. Incorrectly installing the tubes to the sensor adapter will result in a fault code.

Loosen the tube nuts at the front EGR connection tube and the sensor adapter.

Remove the tubes.

Tag the ends of the tubes before removing the sensor tubes.

Incorrectly installing the tubes to the sensor adapter will result in a fault code.

Loosen the tube nuts at the EGR venturi tube.

Loosen the hose clamps at the sensor adapter.

Remove the tubes.

Carbon deposits inside the tubes can cause an amber CHECK ENGINE light, in addition to any combination of the following:

• Low power
• Black smoke
• Engine surge
• Engine runs rough
• Exhaust gas recirculation valve delta pressure fault code.

Check the inside of the tubes.

If a tube is clogged or partially clogged, replace the tube.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Inspect the mating orifices for the EGR crossover tubes.

If clogged, saturate the carbon deposit with a mineral-based solvent, or equivalent.

Carefully clean debris from the mouth of the tube, making sure
not to damage the orifice.

Dry with compressed air.

Refer to Procedure 011-022 in Section 11.

Carbon deposits inside the tubes can cause an amber CHECK ENGINE light, in addition to any combination of the following:

• Low power
• Black smoke
• Engine surge
• Engine runs rough
• Exhaust gas recirculation valve differential pressure fault code
• Progressive damage to the Cummins® particulate filter.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

NOTE: If coolant is found in the EGR differential pressure sensor tubes, they
must be replaced.

Check the inside of the tubes.

If a tube is partially clogged, saturate the inside of the tube with mineral based solvent, or equivalent.

Carefully clean the debris from the mouth of the tube. Make sure
not to damage the tube.

If the tube is fully clogged or otherwise unable to be cleaned, the tube
must be replaced.

Clean the tube with safety solvent.

Dry with compressed air.

Check the tubes, hose, and hose clamps for cracks or other damage.

Replace the tubes if the tubes or hose is damaged. Replace the hose clamps if damaged.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Inspect the mating orifices of the EGR crossover tubes.

If clogged, saturate the carbon deposit with a mineral-based solvent, or equivalent.

Carefully clean the debris from the mouth of the orifice, make sure
not to damage the orifice.

Dry with compressed air.

Refer to Procedure 011-025 in Section 11.

For engines beginning with ESN 14040552, the tubes
must be installed so they do
not cross over each other.

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

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

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

The tubes
must be installed so they do
not cross each other.

Apply a light lubricant (CRC 3-36, WD-40, or equivalent) to the tube threads and install the tubes. The lubricant is to 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 EGR venturi connection.

Tighten the hose clamps at the differential pressure sensor adapter.

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 is the most effective location and also reduces the possibility of heat soaking of the EGR differential pressure sensor.

• If removed, install the EGR differential pressure sensor.
  Refer to Procedure 019-370 in Section 19.
• Start the engine and verify proper operation.
• Check for fault codes.

• If removed, install the EGR differential pressure sensor.
  Refer to Procedure 019-370 in Section 19.
• Start the engine and verify proper operation.
• Check for fault codes.
• If damage resulted in coolant, oil, excessive fuel or excessive black smoke entering the exhaust system, the aftertreatment system
  must be inspected.
  Refer to Procedure 014-013 in Section 14.