TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM 9-2815-202-34 4-35. CRANKSHAFT MAINTENANCE (Cont.) NOTE Maximum clearance between connecting rod journal and bearing shell is 0.0045 inch (with new shells). Maximum clearance between main bearing journal and bearing shell is 0.0055 inch (with new shells). Main bearing journal taper must not exceed 0.0006 inch or out of round must not be greater than 0.0005 inch. Replace crankshaft if measurements exceed limits. (4) Measure all main and connecting rod bearing journals. Measure journals at several places on circumference so that taper (calculated from two end outside diameter measurements of journal), out of round, and bearing clearances can be determined. Measurements should be accurate to nearest 0.0002 inch. (5) Measure crankshaft thrust surfaces at points A and B. Dimension A must be 1.499 to 1.501 inches and dimension B must be 1.915 to 1.925 inches. f. Assembly (1) Install four pipe plugs (18) into crankshaft (14). Torque plugs to 10-12 Ib-ft (14-16 N-m). (2) Position gear (13) on rear end of crankshaft (14) with bolt holes in gear alined with tapped holes in crankshaft. One bolt hole is offset so gear can be attached in only one position. Install six bolts (12) through gear and into crankshaft. Torque bolts to 35-39 lb-ft (47-53 N-m). (3) Install spacer ring (17), with beveled side toward main bearing cap, and woodruff key (16) on front of crankshaft. install oil pump driving gear ( 5) with chamfer toward main bearing cap and slide gear on shaft and over woodruff key. Install gear tight against spacer ring (17). 4-158