METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
the most satisfactory. Because of the high degree of heat generated by
using acetylene and oxygen, there is a danger of damaging light metal. City
or natural gas is the best; next is liquid petroleum; and last oxyacetylene.
After the metal has been cleaned and retinned, reassembly of the radiator
can begin. There is no prescribed pattern of reassembly except the radiator
baffle plate must be installed first. All parts are fluxed with suitable
flux and soldered together. The upper tank is set in place on the core and
tack soldered on each corner. After tacking in place, solder each end.
After the ends are soldered, start on one corner of the tank and solder the
tank all the way around.
f. Repairing Radiator Leaks. After leaks have been marked, the radiator is
removed from the test tank and repaired.
(1) Seam Leaks.
(a) Apply heat and remove the old solder, using the air gun or wire
brush method.
(b) Old solder is removed for a distance of three inches on each side
of the leak.
(c) Using a squirt bulb or an acid brush, flush the seam with
muriatic acid.
(d) Beat the seam until the acid boils, then quickly blow or wire
brush out the acid. This removes all dirt and oxides, which are the cause
of poor solder bonding. Care must be taken not to direct the airstream or
wire brush toward anyone when removing acid or hot solder.
(e) Flush seam liberally with flux, using a squirt bulb or acid
brush. Keep seam warm with torch while flushing. Remove all flux with
moderate airstream.
(f) Proceed with soldering in the usual manner.
(2) Patching Cracked Tanks Brass Radiator Tanks. Almost all radiator
tanks are cast or stamped in one piece to reduce the number of potential
leaks.
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