SECTION VII. Engine Structure/Internal Components
3-15. PISTON, ENGINE, PERFORATED HEAD
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:
q Degraded mobility
q 2 soldiers
q 2 hours
q Defer repairs
1. Remove one rocker arm cover.
2. Start engine.
3. Press firmly on injector guide follower of each injector.
4. Listen for a change in engine operation. If a change is noticed, the cylinder is
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
8. Record the BDAR action taken. When the mission is complete, as soon as
practicable, repair the vehicle using standard maintenance procedures.