TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-281 S.220-34 Fiy11 re-172. Removing c+· i11sta/li11g cnkshaj� oil retaining µlugs. 3-55. Cleaning Refer to pru·agraph 3-36. Clean crankshaft oil pas- sages with compressed air and brass wire probes. NOTE Care must be taken not to destroy 01· re- move main and connecting rod bearing location markings. 3-56. Inspection a. CnkslwJl. (1) Inspect c1·ankshaft for cracks with a mag- nifying glass (five power magnification minimum) and a strong light Pay pa1·ticular attention to areas around crankshaft oil holes and fillets adja- cent to the crankshaft counter weights. (2) Inspect connecting rod joual radii of crankshaft for evidence of specific points of wear or damage that would indicate a bent 01· twisted con- necting rod. (3) Check diameters of main bearing and con- necting rod journals against limits specified in re- pair standards (table 3-8). Check runout of crankshaft by supporting end jouals in "V" 3-84 Change 1 blocks and measuring runout at center joumals with a dial indicator. Maximum allowable runout is 0.025 inch at No. 4 journal. (4) Inspect jouals for nicks, burs, grooves, scratches, galling, scuffing, or discoloration. Mark minor defect areas for future repair. (5) Check dowel pins and straight pins for tightness in the crankshaft flanges. Check pins against limits specified in the repair standards (ta- ble 3-8). b. Connecting Rods and Bearinys. (1) Becirings. Inspect connecting rod bearing halves (fig. 3-170) in the same manner as described for main sleeve bearings (para 3-4). Apply a thin coating of Prussian blue, Part No. MI L-P-30501, t o the backs of the connecting rod bearings and i n- stall in their respective connecting rods and caps according to the location markings (fig. 3-170). A- semble rod and cap, and torque tighten to 1250- 1300 pound-inches. Check bearing inside diameter, using a dial bore indicator as shown in figure 3-173, against the limits specified in the repair standards (table 3-8), and for contact as shown by Prussian blue, transfer in the same manner in which the main sleeve bearings were checked (para 3-4). Replace any bearing that does not make at least 75 percent contact. Figure S-173. Checking co1111ecli+g rod bri11g bore 11si11g dl bore indicator. ) )