TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 87 of 343
TM 9-2350-358-BD
SECTION XI.
HOUSINGS
3-33.
GENERAL
Castings of plates may be serviceable even with holes or cracks, providing the internal 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 of the structure can be allowed but fatigue failure from crack growth cannot be
predicted, and service life will depend on the extent of damage.
3-34.
ENGINE/TRANSMISSION HOUSING, DAMAGED
Small cracks or holes may develop in the engine or transmission housing caused by vibration, overheating, or explosive
shocks.
Cracks that allow oil to escape must be repaired.
Large holes or cracks will require replacement of oil.
Frequent
oil level checks must be performed, after repair.
Depending on the extent and location of the damage, the powerpack may
have to be removed.
Option 1
Limitations:
None
Personnel/Time Required:
•
1 soldier
•
Time to be determined by location and amount of damage.
Materials/Tools:
•
File (found in M2/3 generic BDR kit, Section III, Appendix C)
•
Fuel cell patch kit (plug) (depending on size of hole) (found in M2/3 generic BDR kit, Section III, Appendix C)
References:
•
TM 9-2350-314-20-1-1
•
TM 9-2350-314-20-1-2
Procedural Steps:
1.
Drain housing of oil until level is below damaged area.
Store oil in container until repair is complete.
2.
Obtain plug the approximate size of the hole.
3.
Using a round file, file the hole to a size equal to the plug diameter.
4.
Install plug assembly and tighten wing nut.
5.
Return oil to housing.
6.
Record BDAR action taken.
When mission is complete, as soon as practical, repair the equipment/system using
standard maintenance procedures.
3-42
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