Crankshaft, Main Bearings and Flywheel/Crankshaft CTM3274 (01JUL99) 15-23 Saran Liter Engines 060799 PN=120 CRANKSHAFT REGRINDING GUIDELINES If the crankshaft is to be reground, use the following NOTE: When thrust surfaces are reground and an recommended guidelines: oversize washer is used, crankshaft end play specification must be maintained. 1. Determine the size to which the journals are to be reground according to the measures taken during 6. If the thrust surfaces of the crankshaft are worn or inspections. grooved excessively, they must be reground and polished. Care must be taken to maintain the 2.
If one or more main or connecting rod journals specified radius between each thrust surface and the require grinding, then grind all of the main journals or bearing journal. An oversize thrust washer set is all of the connecting rod journals to the same available. required size. Grind clockwise (as viewed from nose of crankshaft). 7. Stone the edge of all oil holes in the journal surfaces smooth to provide a radius of approximately 3. All journal fillets radii must be free of any sharp 1.50 mm (0.060 in.). grind marks or scratches. The fillet must blend smoothly into the journal and crank cheek. The radius 8. After grinding has been completed, inspect the may be checked with a fillet gauge.
crankshaft by the fluorescent magnetic particle method, or other similar method to determine if 4. Care must be taken to avoid localized heating cracks have originated due to the grinding operation. which often produces grinding cracks. Use coolant generously to cool the crankshaft while grinding. Do 9. De-magnetize the crankshaft. not crowd the grinding wheel into the work. 10. Thoroughly clean the crankshaft and oil passages 5. Polish or lap (clockwise) the ground surfaces to with solvent. Dry with compressed air. the specified finish except for cast iron crankshafts (see “MICRO-FINISHING SPECIFICATIONS” in this group).
The reground journals will be subject to excessive wear unless polished smooth. CD,3274,G15,33 -19-01MAR92 15 23