METAL BODY REPAIR - OD1653 - LESSON 2/TASK 2
(c) Reheat the tube at the header plate, and using a pair of needle
nose pliers, bend the tube down and out to one side and remove from the
header plate.
(d) Retin the area where the tube was removed from the header plate.
(f) Repeat the same operation at the other header plate.
g. Straightening a Bent Radiator Core.
A bent radiator core can be
straightened, provided the bend is gradual. If it is so sharply kinked that
the water tubes or passages are collapsed, it should not be straightened.
Straightening is done in a press, with boards above and below the core, to
spread the pressure and protect the air fins. Hydraulic presses may be used
for this operation.
WARNING
Epoxy materials may cause
skin
irritation.
If epoxy
resins and hardeners come
into
contact with the skin,
wash the skin thoroughly
with
mild soap and water.
Always use epoxy resins
and
hardeners in a well-
ventilated area.
h. Repair of Aluminum Radiators. Damaged radiators are repaired with epoxy
resins, glass cloth, and aluminum screen. Due to the limited storage life
of the resin and hardener, repair of aluminum radiators with material which
has been in storage for more than one year is not recommended.
Mixing
ratios of epoxy resins to hardeners normally are given by weight. The ratio
by weight is 100 parts epoxy to 14-17 parts hardener.
When weighing equipment is not available, 5-6 parts epoxy resin by volume to
1 part hardener by volume is the recommended volume mixing ratio. The 5 to
1 ratio will produce a compound with a shorter pot life (working time) than
the 6 to 1 ratio (working life of the resin hardener mixture is
approximately 15 to 25 minutes at 75 degrees F).
If desired, the entire
contents of both the hardener and resin cans may be used by adding the
contents of the hardener
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