C15 and C18 – Exhaust Cooler (NRS) – Test

Table 1
Tools Needed for the Exhaust Cooler Pressure Test
Part Number Part name Quantity
378-4525 Plug  (1) Expandable rubber plug 1
378-4526 Plug  (2) Expandable rubber plug 1
367-7435 Plug  (3) Vented turn-tite plug 1
19S-8140 Pressurizing Pump 1
21U-5470 Engine Pressure Gp 1
( 1 ) Used for C9.3 engines
( 2 ) Used for C13 – C18 engines
( 3 ) Used on both C13 – C18 engines and C9.3 engines.

Note: 1 Use for the On engine test

Note: 2 Use for the Off engine test

On Engine Test Procedure

An external leak of the exhaust cooler can often be found by making a visual inspection. To check for internal leaks in the air side, use the following procedure.

 

  1. Remove the components attached to ports (3) , (4) on the air side of the cooler. Typical components are bellows, air lines, or hoses.
  1. Pressurize coolant system with the 9S-8140 Pressurizing Pump . Refer to Testing and Adjusting Section, “Testing the Radiator and Cooling System for Leaks”.
  1. While the cooling system is pressurized, observe the cooler for leaks. If no coolant leaks from the air side of the cooler after 15 minutes, the NRS-cooler is reusable.
  1. If the NRS-Cooler does not leak, the problem may be elsewhere in the cooling system or the engine. Refer to the appropriate service manual in order to check for leakage.

Off Engine Air Under Water Leak Test Procedure.

Use the 1U-5470 Engine Pressure Gp to perform this test. Refer to Special Instruction, SEHS8907, “Using The 1U-5470 Engine Pressure Group “.


Illustration 2 g02492016
Expandable rubber plug

  1. Plug the air inlet (3) with the expandable rubber plug and air outlet (4) with the vented turn-tite plug on the NRS-Cooler (1) .
  1. Make sure that the air pressure regulator is closed and connect compressed air to the pressure regulator.
  1. Apply a minimum of 34.5 kPa (5 psi), but not more than 68.9 kPa (10 psi) of air pressure to the cooler.
  1. While the NRS-cooler is still pressurized, submerge the cooler in water that is at ambient temperature.
    1. Allow the NRS-Cooler to settle in order for the air that is trapped to escape
    1. Observe the NRS-cooler for air bubbles that indicate a leak.
    1. If no bubbles are observed, follow step 3.
  1. Remove the NRS-Cooler from the water.
  1. While the NRS-Cooler is still pressurized, use a soap solution in order to aid in finding the slow leaks.
    1. Spray the NRS-Cooler with the soap solution on the inner and outer surfaces.
    1. Observe the NRS-Cooler for the formation of bubbles, which indicate a leak.
    1. Note the location or the origin of the leak. Record this information.
    1. If no bubbles are detected after 30 sec, the NRS-cooler is reusable.
  1. If the NRS-Cooler does not leak, the problem may be elsewhere in the cooling system or the engine. Refer the appropriate service manual in order to check for leakage.
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