TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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CHAPTER 3 TROUBLESHOOTING Section I. GENERAL 3-1. Purpose of Troubleshooting Note. Information in this chapter is for use of Direct Support and General Support main- tenance personnel in conjunction with and as a supplement to the troubleshooting section in the pertinent organizational manual (refer to Ap- pendix A). It provides the instructions where a remedy in the organizational maintenance manual refers to supporting maintenance personnel for corrective action. a. Prevent Damage. Operation of a deadlined vehicle without a preliminary examination can cause further damage to the engine and possible injury to personnel. By careful inspection and troubleshooting, such damage and injury can be avoided. In addition, the cause of faulty operation can often be determined without extensive disassembly. b. Precautions by Inspection. Most of the inspections are visual inspection and are to be perform ed before attempting to operate the vehicle. These inspections are mainly to determine the condition and to take precautions to prevent further damage. c. Troubleshooting While Mounted. The troubleshooting performed while the engine is mounted in the vehicle is that which is beyond the normal scope of the using organization. Check the troubleshooting section of the per- tinent organizational manual, then proceed as outlined in this chapter. d. Troubleshooting Engine only. If the engine only is received, inspection should be performed to verify the diagnosis made while the engine was installed in the vehicle. This inspection, to uncover further defects or to determine malfunction, is important as it is the only means for determining the trouble without completely disassembling the engine. 3-2. General Instructions Note. This chapter contains inspection and troubleshooting procedures to be performed while a malfunctioning engine is still mounted in the vehicle and after it has been removed. a. Visual inspections made while the engine is mounted in the vehicle are performed before attempting to operate the vehicle to avoid damage or injury as well as to determine the cause of the malfunctioning engine. b. Troubleshooting performed while the engine is installed in the vehicle beyond the scope of the using organization, is performed to determine if the malfunction can be remedied without removing the engine from the vehicle, and, when subsequent removal is necessary, to indicate when repair can be made without complete engine disassembly. c. Troubleshooting a malfunctioning engine after it has been removed from the vehicle consists of subjecting it to tests on a dynamometer. This chapter discusses those symptoms which can be diagnosed by using testing equipment, interprets results in terms of probable causes, and recommends appropriate corrective action. d. Tests and adjustments prescribed for an engine after assembly (para 8-5) may be applied to the engine in which the malfunction is suspected. Particular attention should be given to proper oil level, fuel pressures and proper adjustments when operating the engine to determine appropriate corrective action to be taken for the malfunction. Section II. TROUBLESHOOTING PROCEDURES 3-3. General refer to pertinent manuals listed in paragraph 1- Most engine troubles are actually engine 24. The procedures for troubleshooting the accessory troubles. The troubleshooting portion engine assembly and the accessory systems are of pertinent organizational maintenance listed in paragraphs 3-4 through 3-11. Engine manuals, normally, will cover troubleshooting of malfunctions are referenced to the appropriate all engine accessories while mounted on the accessory system for corrective action, when engine. For complete coverage of accessories, applicable. 3-1