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 TM 55-1905-222-14
6-23
REPAIR PROPELLER AND PROPELLER SHAFT.
INITIAL SETUP
Tools:
Equipment Conditions:
Tool Kit, Mechanic's, Rail
Reference
and Marine
removed.
Blacksmith's Forge
Anvil
Machine, Welding
REPAIR
1. REPAIR PROPELLER.
a. Heating Propellers.
Small bends or
depressions in bronze propellers can be
straightened while the propeller is cold.
Because cold working hardens bronze,
large bends or irregularities must be
repaired using heat to prevent cold cracks
from occurring. When heat is used, heat
propeller to a dull red color in a forge or
with a gas flame. For overall heating
where large surfaces are involved, the
forge is faster and gives a more uniform
application of heat. Figure at right shows
a propeller being heated with a forge. For
small or localized repairs, a gas flame
should be used.
CAUTION
Bronze becomes weak at high temperatures and the propeller, if struck, can sag or break.
Exercise care when handling or repairing a heated propeller.
6-121
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