TM-9-2350-275-BD Battlefield Damage Assessment and Repair for M113 Family Download
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TM 9-2350-275-BD SECTION VII. Engine Structure/Internal Components 3-15. PISTON, ENGINE, PERFORATED HEAD General Information Loss of engine power because of hole in piston head. For brief periods of operation it is unnecessary to take any corrective action. For extended operation it is necessary only to disable the fuel injector of the cylinder with the bad piston. the problem arises in identifying the cylinder. The value of compression is not important, only enough to ensure that there is no hole in the piston. While engine is still in the vehicle, check each cylinder using the following procedure: Limitations: ● Degraded mobility Personnel/Time Required: ● 2 soldiers ● 2 hours Other Options: ● Defer repairs Procedural Steps: 1. 2. 3. 4. Remove one rocker arm cover. Start engine. Press firmly on injector guide follower of each injector. Listen for a change in engine operation. If a change is noticed, the cylinder is functional. 5. If a change is not noticed, the cylinder is not functioning. 6. Verify the injector is functioning by swapping with another injector. 7. If injector is functional, readjust fuel rack to a “no-fuel” position at the defective cylinder. 8. Record the BDAR action taken. When the mission is complete, as soon as practicable, repair the vehicle using standard maintenance procedures. 3-14