METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
CAUTION
Repair area temperature must not exceed 100 degrees F
anytime thereafter. Minimum distance between the heat
lamp and repair area is two feet, regardless of the
temperature requirement.
(6) Allow the completed patch to set undisturbed for 16 to 24 hours.
j.
Repair Procedures for Cores.
(1) For lacerations in the core, remove fins approximately 1/2 to 3/4 of
an inch beyond the damaged cross tubes.
(2) Remove jagged edges from the cross tubes, clean with a penciltype
wire or grinding wheel, and continue preparation.
(3) Prepare a proper amount of epoxy and hardener. Also add sufficient
amount of silica to obtain a workable consistency (soft, puttylike).
(4) Force the epoxy mixture into the cross tube and close the tube with
pliers. Apply a second coat of epoxy mixture over the closedoff tube and
immediate surrounding area. Allow the repair to dry.
CAUTION
Do not test aluminum radiators in a tank that has been
or is being used for testing copper/brass radiators.
Fluxes used in copper/brass radiator repair will
contaminate the water in a test tank and will attack
aluminum.
(5) Test. To test the radiator repair, block all inlet and outlet
connections, install pressurizing equipment, and apply 18 psi for a period
of three minutes while the radiator is immersed in water. Absence of air
bubbles denotes a satisfactory repair.
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