ARMY TM 9-2815-257-24
AIR FORCE TO 38G1-128-2
MARINE CORPS TM 10155A/2815-24/3
Section III. DIRECT SUPPORT LEVEL TROUBLESHOOTING
This section contains direct support level troubleshooting and tests for the engine assembly. Each
malfunction or trouble symptom is addressed and is followed by a series of inspections or tests necessary to
determine the probable cause and corrective action.
a. This chapter does not list all possible malfunctions that may occur, all tests or inspections that may be
performed, or all corrective actions for each malfunction. Only those checks and tests authorized for the direct
support level are covered. If a malfunction is not listed, or is not remedied by corrective actions, notify
personnel at a higher maintenance level.
b. Prior to using troubleshooting table, be sure you have performed all normal operational checks.
c. These troubleshooting procedures assume that electrical wires are undamaged and wiring harnesses
are operable. Conduct continuity checks on suspect wiring / harnesses as required prior to performing
troubleshooting procedures in Table 4-2.
d. Refer to Table 4-1, Malfunction Index, for determining applicable troubleshooting procedure located
in Table 4-2.
Table 4-1. Malfunction Index
Engine will not start
Engine starts and stops
Engine speed fluctuates (races or uneven speed)
Engine output drops
Engine runs rough
Engine emits white smoke
Engine emits black smoke