Oil Cooler Internal Leakage Test

Inspection

1. Remove oil cooler (6A642) from engine. Refer to Engine Oil Cooler, Removal in the Removal and Installation portion of this section.

2. Using new header gaskets, attach oil cooler assembly to Rotunda Oil Cooler Internal Leakage Tester 014-00944 or equivalent.

3. Pressurize coolant side of front header test plate at air supply fitting with 277 kPa (40 psi) air pressure.

4. Inspect for air leakage at the plastic tubes and at each header cover plate. If no leakage is detected, place a cup of water up to the plastic tubes.

• If no bubbles appear, no internal leak in the oil cooler assembly is indicated.
• If bubbles appear, an internal leak is present in oil cooler assembly.

5. Disengage air source and remove oil cooler assembly from Rotunda Oil Cooler Internal Leakage Tester 014-00944 or equivalent.

6. If leakage was detected, disassemble oil cooler assembly. Refer to Engine Oil Cooler, Disassembly in the Disassembly and Assembly portion of this section. Replace oil cooler bundle tube.

7. Install oil cooler on engine. Refer to Engine Oil Cooler, Installation in the Removal and Installation portion of this section.

8. If engine oil leaked into the coolant, drain and flush cooling system. Refer to Section 03-03. If coolant leaked into the engine oil, change the oil and oil filter (6731).