C1.5 and C2.2 Engines for Caterpillar Built Machines Caterpillar

Refer to Special Instruction, SEHS8907, "Using The 1U-5470 Engine Pressure Group".

Air Under Water Leak Test Procedure.

Illustration 1	g03326632
Typical example

1. Follow steps 1.a to 1.i in order to test the coolant side of the exhaust gas cooler (NRS).

   1. Plug the coolant inlet (3) of the exhaust gas cooler (NRS) (2).

   2. Plug the coolant outlet port (4) with tube and pressure regulator assembly.

   3. Make sure that the air pressure regulator is closed and connect compressed air to the pressure regulator.

   4. Use Tooling (A) in order to apply an air pressure of 300 kPa (44 psi) to the exhaust gas cooler (NRS).

   5. While the exhaust gas cooler (NRS) is still pressurized, submerge the cooler in water that is at ambient temperature.

   6. Allow the exhaust gas cooler (NRS) to settle in order for the air that is trapped to escape.

   7. Observe the exhaust gas cooler (NRS) for air bubbles that indicate a leak. If air bubbles are seen within 30 seconds, this indicates a leak with the exhaust gas cooler (NRS). Note the location or the origin of the leak. Record this information.

   8. If no bubbles are detected after 30 seconds, the exhaust gas cooler (NRS) is reusable.

   9. Remove the exhaust gas cooler (NRS) from the water. If the exhaust gas cooler (NRS) does not leak, the problem may be elsewhere in the cooling system or the engine. Refer the service manual in order to check for leakage. If the exhaust gas cooler (NRS) does leak, the exhaust gas cooler (NRS) should be replaced.

2. Follow steps 2.a to 2.i in order to test the gas side of the exhaust gas cooler (NRS).

   1. Plug the gas inlet (5) of the exhaust gas cooler (NRS) (2).

   2. Plug the gas outlet port (1) with tube and pressure regulator assembly.

   3. Make sure that the air pressure regulator is closed and connect compressed air to the pressure regulator.

   4. Use Tooling (A) in order to apply an air pressure of 300 kPa (44 psi) to the exhaust gas cooler (NRS).

   5. While the exhaust gas cooler (NRS) is still pressurized, submerge the cooler in water that is at ambient temperature.

   6. Allow the exhaust gas cooler (NRS) to settle in order for the air that is trapped to escape.

   7. Observe the exhaust gas cooler (NRS) for air bubbles that indicate a leak. If air bubbles are seen within 30 seconds, this indicates a leak with the exhaust gas cooler (NRS). Note the location or the origin of the leak. Record this information.

   8. If no bubbles are detected after 30 seconds, the exhaust gas cooler (NRS) is reusable.

   9. Remove the exhaust gas cooler (NRS) from the water. If the exhaust gas cooler (NRS) does not leak, the problem may be elsewhere in the cooling system or the engine. Refer the service manual in order to check for leakage. If the exhaust gas cooler (NRS) does leak, the exhaust gas cooler (NRS) should be replaced.