TRUCK SERVICE MANUAL
4. Use mineral spirits or equivalent to clean out
2. If oil passages are badly clogged, circulate an oakite
or alkaline solution through the tubes. After cleaning,
lubricating oil and contaminates trapped in housing by
flush thoroughly with hot water.
forcing cleaner through oil ports in reverse direction of
5. To remove element (1) from housing (2): a. Insert
CLEANING (WATER SIDE)
two long rods into outside row of tubes opposite each
1. Plug oil inlet and outlet.
b. Place a flat bar on top of housing and bundle face
2. Immerse oil cooler in solution of one part muriatic acid
between rods, and rotate element in housing to unseal
and nine parts water after adding 1 lb. [0.45 kg] of oxalic
lower "O" ring.
acid and 0.01 gal. [0.04 lit., 0.008 UK gal.) of pyridene to
c. Remove tube bundle from cooler housing. Two small
each 5 gal. [18.9 lit., 4.16 UK gal.] of acid.
threaded holes are provided in end of tube bundle; if
3. Remove core when foaming and bubbling stops.
necessary make a suitable puller utilizing the two
Immerse unit in a 5% solution of sodium carbonate.
threaded holes in end of tube bundle.
Remove when bubbling ceases and pressure flush with
6. Discard "O" rings (3) and retainers,(4).
clean warm water.
Note: Flush inside of tubes with clean, light oil after both
Note: To prevent hardening and drying of foreign
oil and water sides of cooler have been cleaned.
substances, clean core or cores as soon as possible
CLEANING (OI L SIDE)
1. Immerse core in approved cleaning solvent, let stand
1. Seal both ends of tube bundle. Immerse tube bundle
several minutes. Force cleaner around tubes until clean.
in water and apply approximately 40 psi [2.8 kg/sq cm] air
pressure. If air bubbles are observed, mark bundle for
repair or replacement.
This operation should be done in open air or in a well
ventilated room to avoid toxic effect of chemicals
2. Inspect support for broken or cracked welds; repair or
replace as necessary.
3. "O" Ring
Fig. 7-9 (N10741) Lubricating oil cooler exploded view