Testing. - TM-55-1930-208-240131

TM 55-1930-208-24

3-23. COOLER, LUBRICATION OIL - Continued.

b. Cleaning Continued.

(2) Clean the coolant side of the core as follows Continued:

(d) Apply primer coating to core after drying.

NOTE

Do not attempt to clean an oil cooler core when an engine failure occurs in which metal particles

from worn or broken parts are released into the lubricating oil. Replace the core.

c. Testing.

(1) Make a suitable plate and attached to the flanged side of the oil cooler core.

(2) Make a rubber gasket to insure a tight seal between the plate and core.

(3) Drill and tap the plate to permit an air hose fitting to be attached at the inlet side of the oil cooler

core.

WARNING

Wear eye protection to prevent personal injury in the event that there is a rupture in the

pressurized system.

(4) Attach an air hose and apply 75-150 psi (517-1034 kPa) air pressure. Then submerge the oil

cooler core and plate assembly in a tank of heated water (180 or 82 ). Any leaks will be

indicated by air bubbles in the water.

(5) After the pressure check is completed, remove the plate and air hose and dry the oil cooler core

with compressed air. Replace the oil cooler core if leaks were indicated.

d. Inspection.

(1) Inspect for missing or damaged hardware.

(2) Inspect cover for cracks or warping.

(3) Inspect core for cracks or signs of leakage.

e. Repair. Repair is limited to replacement of defective parts.

3-94