3-42. OIL COOLER REPAIR (Contd)
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only
with effective chip guarding and protective equipment such as goggles or shield, gloves,
etc. Failure to comply may result in injury to personnel.
Approved solvents may be flammable and will not be used near open flame. Use only in
well-ventilated area. Failure to comply may result in injury to personnel.
Cleaning procedures for the oil cooler assembly are the same for M915/Big Cam I and
M915A1/Big Cam III. M915/Big Cam I is shown.
Clean lubricating oil and
Use compressed air.
contaminants by forcing solvent
SD-3 through oil ports in reverse
direction of normal flow.
Filter element (6)
a. Immerse in solvent SD-3 and
Force solvent around tubes and
let stand for several minutes.
clean using compressed air.
b. After cleaning, flush thoroughly
with hot water.
c. Prepare solution containing one
part muriatic acid and nine parts
water. Add 1 lb (0.454 Kg) oxalic
acid and 1.28 fl. oz. (37.85 ml)
pyridene to each 5 gal. (18.9 L) of
d. Immerse in solution.
e. Remove when foaming and
Reaction normally stops in 30 to
f. Immerse in 5 percent solution of
g. Remove when bubbling stops.
Flush inside of tubes with light
Pressure-flush with clean, warm
oil after both oil and water sides
of cooler core are clean and dry.
All other parts
Refer to para. 3-6 for cleaning