After cleaning, dip core in a light weight engine oil.
Do not attempt to clean the oil cooler core after an engine failure occurs in which metal particles
from worn or broken parts are released into the lubricating oil. Replace the oil cooler core.
Test. After oil cooler has been cleaned, test it for leaks as follows:
Before testing inspect all parts for cracks, breaks or other damage. Do not test an oil cooler that
requires repair or replacement.
When making the pressure test, be sure that all personnel are adequately protected against leak or
rupture of a fitting, hose, or the oil cooler core. Eye protection is required. Leaks will be evident
before reaching test pressure. If there are core leaks terminate the test and replace the oil cooler
core. If the core ruptures at test pressure serious injury could occur.
Make a suitable test plate and attach it to flanged side of cooler core. Use a gasket made from rubber to
assure a tight seal. Drill and tap test plate to permit installation of an air hose fitting at inlet side of core.
Attach an air hose and apply 75-125 psi, and submerge cooler core and test plate in a container of water.
Any leaks will be indicated by air bubbles. If leaks are indicated, replace core.
Safety glasses must be used when cleaning parts with compressed air.
After pressure check is completed, remove plate and air hose from cooler core. Dry core with compressed
Inspection and Repair
Reinspect all parts for cracks, breaks or other damage.
Inspect hardware and threaded holes for damaged threads.
Discard and replace all gaskets.
Repair damaged threads if possible. Replace all defective parts.
5-56 Oil cooler reassembly and installation
Reassembly. Reassemble oil cooler assembly in reverse sequence of disassembly procedure.
Installation. Install oil cooler assembly in reverse sequence of removal procedure.