Straihteninga Bent Radiator

(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 1417 parts hardener.

When weighing equipment is not available, 56 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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