TM-9-2350-358-BD M109A6 Battlefield Damage Assessment and Repair Download
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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