TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM 9-2815-202-34 4-22. FLYWHEEL ASSEMBLY REPLACEMENT (Cont) (2) Flywheel housing bore concentricity and face runout a. Mount dial indicator base (12) to flywheel (2). b. Position one dial indicator(13) perpendicular to flywheel housing bell face and a second dial indicator (14) against flywheel housing bell bore. c. Pry flywheel toward engine block (at six o’clock position) to insure end play is in one direction. d. Adjust dial indicators to read zero at twelve o’clock position. CAUTION When using hexagon head bolt at front of crankshaft to turn crankshaft, always clockwise. Serious engine damage may result if bolt becomes loose. NOTE ● Total indicator reading is the maximum negative reading plus the maximum turn bolt positive reading. For example, if maximum readings were 0.004-and-0.007 inch, then runout is 0.011 inch. ● Maximum total indicator reading must not exceed 0.013 inch for either bore concentricity or face runout. e. Rotate crankshaft and record readings at 60 degree intervals (6 readings each for bell bore and face). Pry flywheel toward engine block before taking each reading. f. If bore concentricity or face runout exceeds its maximum limit, remove flywheel housing and check for foreign material on end plate, flywheel housing, and cylinder block mounting surfaces. Remount end plate and housing. If either reading is still out of limits, replace flywheel housing (see Para 4-24). END OF TASK 4-76