METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
which a tube has been soldered for the air hose. The tool shown in figure
36 for testing individual tubes, is simply a core shaped rubber stopper with
a 1/4 inch diameter hole at the large end, increasing abruptly to 1/2 inch
at the small end. A brass tube extends through the 1/4 inch opening to the
beginning of the 1/2 inch hole. A washer soldered onto the brass tube
prevents it from being pushed in further. The air hose is slipped over the
tube. To use the test tool, submerge the core in a test tank, place the
tool over one end of the tube to be tested, and allow the water in the tube
to be blown out by the air pressure. Then, with the radiator level, close
the opposite end of the tube with a finger. Bubbles will then appear
wherever the tube leaks.
FIGURE 36. TEST TOOL FOR TUBULAR CORES.
(6) Water Test. The water test, so called because leaks are indicated
by escaping water, replaces the air test when equipment is limited, or