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TM 5-4320-305-24
4-12. REPLACE/REPAIR CRANKSHAFT ASSEMBLY (Continued)
cloth evenly around circumference of crankpin or journal until surface is polished smooth. If wet crocus cloth is not
effective, use emery cloth, 120 grit for removing imperfections and 240 grit for finishing. Polish smooth with wet
crocus cloth. Use of a piece of rawhide or other suitable rope wrapped around the emery cloth or crocus cloth and
drawn back and forth will minimize the possibility of an out-of round condition developing (keep the strands of
rawhide apart to avoid bind). If rawhide or rope is not used, the crankshaft should be rotated at intervals. If the
above procedure is not effective or imperfections are too great, the crankshaft must be replaced.
3
All crankpin and journal fillets must have a 0.1693 to 0.1772 inch (4.30 to 4.50 mm) radius between crank cheek
and crankpin or journal and must not have any sharp grind marks. Fillet must blend smoothly into crankpin or
journal and crank cheek, and must be free of scratches. Check radius with a fillet gage and polish smooth any
slight imperfections with crocus cloth wet with diesel fuel oil. If radius is too far outside specified limits, the
crankshaft must be replaced.
4
Stone edges of all oil holes in crankpin and journal surfaces with surfacing stone to provide a smooth radius.
WARNING
Death or serious injury could occur if diesel fuel oil is not handled carefully. Use
in a well-ventilated area away from open flame, arcing equipment, ignition
sources, heaters, or excessive heat. Always store fuel in proper, marked
containers. DO NOT SMOKE.
5
Polish ground surfaces to an 8 to 12 RMS finish with crocus cloth wet with diesel fuel oil.
6
Inspect crankshaft thrust surfaces. If slightly worn or grooved,
smooth out and polish surfaces with wet crocus cloth. Make
sure to leave a 0.1693 to 0.1772 inch (4.30 to 4.50 mm) radius (1)
on crankshaft between each thrust surface (2) and bearingjournal
(3) or crankpin.
7
Clean up minor burrs and gouges of the shaft seal and preformed packing seats with emery cloth. Repair any
minor damage, nicks, burrs, rust, or corrosion. If defects cannot be removed, replace the rear-end cover.
4-99
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