Section VII. REPAIR OF RADIATOR
The cooling system consists of a radiator, water pump,
pipe and plug all other openings. Submerge radiator in a
thermostat, fan, and hoses, lines, and fittings required to
tank of water and apply 5 psi air pressure.
conduct coolant through the engine to the radiator and
e. Repair leaks using soft solder which has a 34-
back to the engine to complete the cooling circuit. Drain
35%tin content and 55-65%lead. Flux shall be zinc
valves are located on the lower radiator hose connection
choloride or resin. Flush liberally with water after
and at the right rear of the engine block to drain the
soldering has been completed. Straighten any fins that
radiator and block.
restrict air flow.
Note. Be sure repair does not restrict coolant
f. Clean fan; fan guard and attaching hardware in dry
cleaning solvent (Federal Specification P-S-661) and dry
Refer to TM 5-3810-294-20 and remove the radiator and
thoroughly with compressed air.
g. Inspect fan blades for cracked or bent condition.
Replace a defective fan.
3-39. Cleaning, Inspection and Repair
h. Inspect fan guard for broken wire and other damage.
Repair or replace a defective fan guard.
a. Flush the inside of the radiator with a suitable
i. Inspect mounting hardware for damage. Replace
cleaning solution. Avoid high pressure so as not to
damaged hardware items.
damage the radiator core.
b. Clean radiator core with compressed air or water
under pressure from the fan side.
c. Clean the overflow line with compressed air.
Refer to TM 5-3810-294-20 and install fan and radiator.
d. Test radiator for leaks with air pressure. Use a
suitable adapter to connect air hose to radiator outlet