TM 9-2815-202-34
CHAPTER 2
TROUBLESHOOTING PROCEDURES
Contents
Para
Page
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-1
Preliminary inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-1
Malfunction, Test or Inspection, and Corrective Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-2
Symptom Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
2-2
Malfunction, Test or Inspection, and Corrective Action Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2-3
2-1. GENERAL. Troubleshooting is a logical, systematic search for the cause(s) of malfunction(s).
Direct Support troubleshooting of the engine can be performed with the engine installed in the
vehicle.
NOTE
When troubleshooting is performed with the engine in a vehicle,
the information in this manual will be used in conjunction with the
information contained in the applicable vehicle type-20
maintenance manual.
The purpose of troubleshooting is to establish the nature and extent of repair required to return the
engine to serviceable condition. Thorough troubleshooting before the engine is removed from the
vehicle may reveal malfunctions external to the engine. Correction of such external malfunctions may
prevent the unnecessary effort of removing the engine.
Troubleshooting by a Direct Support shop is necessary to verify the diagnosis made before the
engine is removed. Such troubleshooting may be the only means of uncovering all defects in an
engine received in an unserviceable condition from another activity.
Troubleshooting may be necessary to determine the cause when a repaired engine fails to perform
properly.
2-2. PRELIMINARY INSPECTION
CAUTION
Maintenance personnel must have a thorough knowledge of
vehicle operation before attempting to troubleshoot an installed
engine. The purpose and use of all operator controls must be
thoroughly understood. Refer to applicable vehicle operators
manual for procedures concerning operation of vehicle.
Verification of all preliminary checks at crew and unit level should be made.
If preliminary troubleshooting of the vehicle is not conclusive, refer to vehicle TM’s listed in App A for
preliminary inspections.
2-1
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