Figure 3-3. Reverse Flushing Radiator

TM 10-3930-644-14&P

NOTE

It is not necessary to remove the

radiator to perform reverse flushing.

Simply disconnect the upper and

lower radiator hoses and proceed as

follows.

When the clogging is caused by debris or other similar

foreign material it usually is deposited at the top of the

tubes.

1. Radiator Reverse Flush Proceed as follows (see

Figure 3-3) :

a. Disconnect the hoses at the engine.

Figure 3-4. Reverse Flushing Engine a. Remove the

b. Put radiator cap on tight.

thermostat.

c. Clamp the flushing gun in the lower hose

b. Clamp the flushing gun in the upper hose.

with a hose clamp.

c. Partly close the water pump opening to fill

d. Turn on the water and let it fill the radiator.

the engine jacket with water before applying air

pressure.

d. Follow the same procedure outlined above

for the radiator by alternately filling the water jacket with

water and blowing it out with air pressure (6 lbs. max.)

until the flushing stream is clear.

To clean the cooling fins, It is best to direct an air blast

carrying a grease solvent, such as oleum spirits or

carbon tetrachloride, directed at the back side of the

core and passing through to the front or engine side.

CAUTION

Never use gasoline, fuel oil

kerosene to clean the radiator.

WARNING

Always provide adequate ventilation

of the working area during this

Figure 3-3. Reverse Flushing Radiator

operation to avoid possible toxic

effects of the cleaning spray.

e. Apply air pressure (6 lbs.

max) gradually, to

avoid radiator damage.

3. For regular periodic service of radiator cooling

fins, simply direct a dry air blast against the rear

f. Shut off the air, again fill the radiator with water

of the radiator core to dislodge dust or lint which

and apply air pressure--repeat until the flushing

may have accumulated due to dusty operating

stream runs out clear.

conditions.

g. Clean and inspect radiator cap.

4. The "oil clutch" and "Power Shift" transmission

oil cooler is an integral part of the lower tank of

2. Engine Water Jacket Reverse Flush

the radiator. To properly clean the oil cooler,

Proceed as follows (see Figure 3-4) :

flush tank with an acceptable highly volatile

cleaning solvent and blow out with compressed

air.

R-155-1

3-110