METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
can to that of the resin, which will result in the correct mixing ratio.
i. Repair Procedures for End Tanks. For holes or lacerations in the end
tanks of the radiator, trim away ragged edges and clean with a wire wheel.
Blow away dust and clean the repaired area with naphtha or paint thinner
followed by alcohol.
NOTE
The presence of oil in the repair area will result in
poor
adhesion.
Repair
of
holes
larger
than
approximately 1 inch in diameter is not recommended.
(1) Cut two pieces of aluminum screening slightly larger than the hole
and then wire together so that the radiator material is sandwiched between
the screening.
(2) Prepare a proper amount of epoxy resin and hardener as directed in
subparagraph i above.
Add a sufficient amount of silica to obtain a
workable consistency (soft, putty-like).
(3) Thoroughly saturate the screening with the epoxy mixture.
(4) Cut a piece of glass cloth larger than the hole, saturate with the
epoxy mixture, and form it over the hole and cleaned surrounding area. For
holes larger than 1/2 inch in diameter, a second cloth layer is recommended.
Place a piece of release film on the second patch and with a hardwood
depressor, work out the trapped air pockets by working from the center of
the patch outward.
(5) Apply another cast of epoxy mixture over the glass cloth.
NOTE
Cure will be slow in temperatures below 70 degrees F.
Cure may be shortened to about four hours by placing a
heat lamp over the patch area and gradually increasing
the heat intensity by moving the lamp closer to the
repaired area.
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