METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
around the tank until the cycle is completed. The handle of a wire brush is
ideal for this operation. As the torch is moved the brush handle follows,
keeping approximately three inches to the rear of the flame at all times.
The vibration, set up by the constant tapping, prevents the solder from
resealing.
(b) Air Blowgun. To protect the eyes against molten solder and
fluxes, goggles or face shields must be worn when using this method.
Precautions must be taken that persons walking or working nearby are not
exposed to the fluxes or hot solder that might be flying through the air.
Apply the torch until the solder starts to flow; quickly blow out the molten
solder with a full blast of air. Proceed around the entire tank in this
manner, heating two or three inches of seam at a time.
(4) Lower Tank. The lower tank is removed in the same way as the top
tank.
(5) Filler Neck. Using a pair of slip joint pliers, hold the filler
neck and apply heat to the solder until melted, and remove from the upper
tank. It must be determined what type metal has been used for the filler
neck, inlet pipe, and outlet pipe. Some large stationarytype engines, such
as light plants, have radiators that may have cast iron parts. Great care
must be taken not to destroy the tinned surface of these metals. If the
tinned surfaces are destroyed, they must be retinned before assembly.
(6) Inlet Pipe. Hold the inlet pipe with a pair of pliers, apply heat,
and remove.
(7) Baffle Plate. The baffle plate is soldered to the inside of the
upper tank. On some radiators, baffle plates are riveted and soldered.
Rivets should be removed prior to applying heat. Once the rivets are
removed, heat is applied to the baffle plate and it is removed in the same
manner as one not riveted.
(8) Outlet Pipe. The outlet pipe is removed in the same way as the
inlet pipe.
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