Resolder Header (Tank Removed)

tube junction. Continue soldering without stopping until

3-30.

Removing and Replacing Tanks

the other end is reached.

a. General. After vat cleaning, if the Flo-Test shows

NOTE

excessive water passage restrictions, vat clean again. If

continued vat cleaning will not remove flow restrictions, the

If tank-header seams are overheated, they must

top tank should be removed for rodding of tubes. To rod

be cleaned and resoldered.

the tubes, insert a flat steel cleaning rod through each

tube. When making certain types of repairs, it may be

b. After soldering, use air blow gun while radiator is

necessary to remove both tanks. The method used for

submerged in tank approximately one inch below water

removing the tank will vary in accordance with the type of

surface. This will quickly flush away the flux residue from

header and tank attachment.

the repaired area. The air blow gun will agitate the water

for a more complete flushing. Continue retesting until all

WARNING

leaks are repaired.

Wear safety goggles, rubber shoes and apron

when blowing solder.

3-29.

Resolder Header (Tank Removed)

CAUTION

a. If header has been removed for any reason and

Exercise extreme care to avoid flowing solder

tube ends are freshly tinned, care should be used when

inside header and tank. Excessive solder could

soldering tubes to header. The same applies when

block the tubes.

repairing damage to a new radiator.

b. If tubes are soldered with header in horizontal

b. Solder-on Tanks. These tanks are fitted to a

level position, solder may run through tube-header spaces

raised lip around the edge of the header. The rim of the

and plug tube openings.

tank is attached by fitting the tank rim either inside or

c. When running solder on new or freshly tinned

outside the raised header lip. To remove a tank from this

header, place header in vertical position (tubes horizontal)

type header requires removal of all solder from the lip

and run solder from "face" side, using similar procedure as

channel. The following procedure may be used for

detailed in this section. Figure 3-11 illustrates resoldering

removing and replacing the tank.

header with freshly tinned tubes and tank removed.

(1) Code-mark all components to be removed with a

Header is in vertical position.

scribe so that they will be replaced correctly. A sketch

may also be drawn of the core-tank-bracket assembly.

Remove all necessary brackets and anchorages.

(2) Apply heat to lip of header and when solder is

molten, blow away with air blow gun. Continue around the

lip until all solder is removed from lip channel.

(3) While tank and header are still hot, heat one side

of the header tank seam. Move torch alternately from one

end to the other. This requires more heat and increasing

torch flame for more heat distribution may be necessary.

A larger torch tip may be required.

(4) When entire side is heated, place a wire brush

handle or similar prying device inside one of the tank

opening necks. Carefully pry the side loose. A small

opening along the seam is all that is necessary. A slight

jiggling motion should be used with very little force. The

tank may be easily cracked when hot. The neck joint of

the opening may become loose or bent from too much

force.

(5) When side seam is loosened, repeat the

procedure with other side and ends until tank is removed.

(6) Remove other tank, if required, in the same

manner and perform the necessary repairs.

(7) Before replacing tank, check both header. and

Figure 3-11. Resoldering header in vertical position (tank

tank for proper fit and alinement.

removed).

3-11