TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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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