SECTION VII. MAINTENANCE OF TURBOCHARGERS

Figure 9-69. Tightening Procedure, Oil Pan Adapter

Figure 9-70. Disassembly and Assembly of Turbocharger (Sheet 1 of 2)

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 (13) Replace lube oil hoses and fittings associated with the prelube pump B3, oil sight gage, lubricant temperature thermostat S101, lube oil heater H113, and lubricant temperature switch OT2 from the oil pan, and install the engine duplex fuel filter set and by-pass oil filter set in accordance with the Operator and Organizational Maintenance Manual. CAUTION Serious engine damage will result If the engine Is started before the lubrication system Is properly filled and primed. Elapsed time between priming the lubrication system and starting the engine shall not exceed 3 hours. If, for whatever reason, the engine cannot be started within 3 hours after priming the lubrication system, repeat the entire priming procedure just prior to starting the engine. (14) Before starting the engine, fill and prime the lubrication system in accordance with the Operator and Organizational Maintenance Manual. SECTION VII. MAINTENANCE OF TURBOCHARGERS 9-39. GENERAL The turbochargers increase the pressure of the incoming air before it enters the cylinders. This increases the effective compression pressure and volumetric efficiency, which results in a substantial gain in power. A turbocharger consists of a turbine wheel and compressor wheel mounted on a common shaft and separated by a center housing and back-plate. The center housing and back-plate also serve to separate the turbine housing and compressor housing. During engine operation, exhaust gas enters at the turbine housing, and turns the turbine wheel before exiting through the exhaust system and muffler. Since the compressor wheel and turbine wheel are on a common shaft, the compressor wheel must turn with the turbine wheel. Incoming air from the air cleaner is pulled in by the compressor wheel, compressed between the vanes and housing, and is expelled into the inlet manifold. The compressed air in the manifold enters the cylinders during w the intake stroke of the engine. 9-40. TURBOCHARGER REPAIR AND OVERHAUL. Remove the turbocharger in accordance with the Operator and Organizational Maintenance Manual, and repair or overhaul as follows: a. Disassemble. (1) Match-mark the compressor housing (3, Figure 9-70) and turbine housing (7) to the center housing (18) to facilitate reassembly. CAUTION Separate the housings carefully to avoid damage to the Impeller and turbine wheel. (2) Remove the locknut (1), the V-band (2), and remove the compressor housing (3) from the back-plate (17). (3) Remove the bolts (4), lockplates (5), and damps (6) and separate the turbine housing (7) from the center housing (18). Discard the lockplates. CAUTION When removing or installing the locknut (8), use a flexible socket to help avoid side-loading the shaft. Side-loading could bend the shaft, resulting In excessive runout and vibration problems In the assembled unit. (4) Place the turbine end of the shaft (10) in a vise equipped with soft jaws to avoid damaging the shaft. Match-mark the impeller (9) and shaft (10), and remove the locknut (8), using a flexible socket and extension on the wrench handle. 9-122

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