Figure 7-28. Crankshaft Gear Removal

Figure 7-30. Crankshaft Bearing Installation - TM-5-6115-584-34_134

TM-5-6115-584-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM 5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-3-456-2 TM-0568C-34 Figure 7-28. Crankshaft Gear Removal (14) Remove crankshaft (26) through rear opening in crankcase. b. Clean and Inspect. (1) Crankshaft. Clean crankshaft and blow out all oil passages. Check journals for out-of-round, taper, grooving or ridges. Pay particular attention to ridges or grooves on either side of oil hole areas. Unusual conditions here often point to previous neglect of oil changes. If journal dimensions are not within limits or journals are scored, metallize and regrind crank- shaft to standards. (2) Bearings. Replace bearings if clearances are greater than limits (see table 1-2), or if bearings are worn, grooved or broken. (3) Rear Oil Seal. Inspect seal for wear or dam- age which might cause it to leak. c. Rebuild Crankshaft. If crankshaft requires re- grinding, metallize and regrind to standards. Special procedures must be observed when reworking diesel crankshafts. In addition to regrinding, the crankshaft must be shot-peened and super-finished. Failure to shot-peen the crankpin fillets is likely to cause early failure. When the shaft is reground, follow this data and figure 7-29 to shot-peen each crankpin fillet. (1) (2) (3) Almen gauge reading, 0.012-A. Peen with 0.019 inch diameter cast steel shot. Peen for 30-seconds on each crankpin fillet. Figure 7-29. Crankshaft Peening (4) Mask off connecting rod bearing areas. d. Installation. NOTE After each installation step, check crankshaft to be sure it is not frozen in place. (1) Heat cylinder block (27, figure 7-15) and bear- ing plate (18) at 325° F (163° C) in an oven 30 minutes and press front and rear main bearings (21) into place, aligning bearing housing oil holes (see figure 7-30). (2) Install thrust washers (24, figure 7-15) on locking pins (see figure 7-30). (3) Oil bearing surfaces and install crankshaft (26, figure 7-15) from rear of crankcase, through rear bearing plate hole. (4) Place gasket (22) on each side of shim (23). (5) Before installing bearing plate, tape keyway and sharp edges on crankshaft to protect the oil seal during installation. Mount and secure rear bearing plate (18). (6) Check crankshaft end play (see figure 7-31). Use enough rear bearing plate shims to provide 0.010 7-28

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