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TM 9-2320-356-BD
Section IV.
HOUSINGS, CASTINGS, AND PLATES
3-10. GENERAL
Castings or plates may be serviceable, even with holes or cracks, provided the
structure is not significantly weakened.
Internal structures, such as crankshaft
bearing journal webs, are necessary to distribute loads within the casting.
Some
damage to these elements can be allowed, but fatigue failures from crack growth
cannot be predicted.
Service life will depend on the extent of damage.
3-11.
ENGINE/TRANSMISSION HOUSING DAMAGED
General Information:
Small cracks or holes caused by vibrations, overheating, or explosive shocks may
develop in a cylinder head, block, or transmission housing. Cracks that do not
harm the structural strength of a housing can be deferred, but cracks that allow
coolant or oil to escape must be repaired.
Large holes or cracks will require
exchange of the component.
Depending on the extent and location of the damage,
frequent fluid level checks may be necessary. In some cases, the engine or
transmission may have to be removed.
Use one of the following options to repair a
small crack or hole.
Limitations:
o Reduced mobility
Personnel/Time Required:
o 2 to 3 soldiers
o 2-24 hours
Materials/Tools:
o Sandpaper
o Epoxy
o Plastic steel
o Metal plate
o Bulk issue fiberglass or
epoxy kit
o Hardening sealer
o Lift capability
Procedural Steps:
Option 1:
Repair of Small Crack.
1.
Remove all paint from around the crack.
2.
Cover the crack and 1/4 inch or more of the surrounding area with quick-drying
epoxy.
3.
Allow epoxy to harden before running an engine.
Use heat to speed up curing
the epoxy.
4.
Record the BDAR action taken.
When the mission is completed, as soon as
practicable, repair using standard maintenance procedures.
3-8
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