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FLYWHEEL, CRANKSHAFT, AND MAIN BEARING MAINTENANCE
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Flywheel and ring gear inspection.
TM5-4210-229-14&P 6-13.  FLYWHEEL, CRANKSHAFT, AND MAIN BEARING MAINTENANCE (Continued). (1) Lift the crankshaft out of the crankcase with a hoist and sling. (2) Remove the upper main bearing halves. (3) Remove the rear oil seal wear sleeve using a muffler chisel.  Hold chisel flat against the crankshaft to prevent damage by the chisel's point. INSPECTION a.  Crankshaft and main bearings inspection. Cleaning solvent, (Appendix D, Item 54), is both toxic and flammable.  Keep off skin.  Use only in a well ventilated area and avoid pro- longed breathing of vapors.  Keep away from open flames. (1) Clean all parts with cleaning solvent (Ap- pendix D, Item 54). Compressed air used for cleaning or drying can create airborne particles that may enter the eyes.  Pressure shall not exceed 30 psi (206 kPa).  Wearing of goggles is required to avoid injury to personnel. (2) Dry with compressed air. (3) Clean all the crankshaft internal oil pass- ages of any dirt or sludge that may have accumulated.  Run a wire brush (Appendix D, Item 8) through the oil passages to loosen the deposits, then wash the passages and external surfaces of the crankshaft thoroughly with oil (Appendix D, Item 37). Blow the passages and external surfaces dry with compressed air. (4) Visually inspect the bearings for wear and evidence of uneven bearing support.  If such evidence is found, examine the bearing caps and supporting surfaces of the crankcase for high spots and burrs. (5) Visually inspect the crankshaft journals for scoring. (6) Measure the diameter of each journal using a micrometer.  Measure each journal at two points, at right angles to each other.  Move the micrometer over the entire width of the journal.  Limits of 3.3742 to 3.3755 in (85.705 to 85.738 mm) must be observed. (7) Check hardness on every journal which in- curred a bearing failure or shown evidence of overheating. (a) Using a Rockwell Hardness Tester, check at least three locations. NOTE Fillet hardened shafts should be checked as close to the fillet as possible.  Non-fillet har- dened shafts should be checked at least 1/2 inch (1 3 mm) from the fillet. (b) Check rod journals at top, bottom and one other location.  (Top and bottom determined with journal at top dead center). (c) Minimum hardness: 45 RC.  If any read- ing is below the minimum hardness, replace the crankshaft. (8) Inspect the crankshaft gear teeth and splined collar for wear and chipping.  Re- place damaged parts as required. (9) Visually inspect the drilled holes in the main and connecting rod journals to assure that all passages are open after cleaning. 6-37

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