TM 9-2910-226-34 Table 2-1. Special Tools Section Il. TROUBLESHOOTING 2-6. Purpose. a. Information use of maintenance personnel in this section is for in conjunction with, and as a supplement to the troubleshooting sections in the pertinent vehicle and engine technical manuals. It provides continuation of instructions where a remedy in the above technical manuals refers to maintenance personnel for corrective action. b. Operation of a deadlined vehicle without a preliminary examination can cause further damage to a disabled fuel injection pump and possible injury to personnel. By careful inspection and troubleshooting, such damage and injury can be avoided and, in addition, the cause of faulty operation of a vehicle or fuel injection pump can often be determined without extensive disassembly. 2-7. General Instructions and Procedure. This section contains inspection and troubleshooting procedures to be performed after a fuel injection pump has been removed from the vehicle and/or power plant. a. Inspection after the fuel injection pump is removed from the vehicle and/or engine is performed to verify any diagnosis made when the pump was in the vehicle, to uncover further defects, or to determine any malfunction if the component alone is received by the maintenance activity. This in- spection is particularly important in the last case because it is often the onlv means of determining the . malfunction without disassembling the fuel injection pump. b. Troubleshooting a disabled fuel injection pump after it has been removed from the vehicle and/or engine consists of subjecting it co tests on a suitable test stand. This section discusses those symptoms which can be diagnosed by using the testing equipment and interprets the results in terms of probable causes. Information pertaining to this test is contained in paragraphs 3-49 through 3-52. 2-8. Procedures. After a metering and distributing fuel injection pump has been received by the maintenance activity for preliminary inspect ion, or if performance of the pump has been unsatisfactory due to unknown causes, it must be checked before installing it on a test stand. This check should in- clude a search for any binding or broken parts by rotating camshaft and operating lever. When cause for failure has been found, fuel injection pump should be disassembled and repaired before proceeding with the tests. Additional operational tests performed on a damaged fuel injection pump could only increase the damage. If no cause for failure is found in inspection, fuel injection pump should be put on test stand and troubleshooting performed. 2-3