CRANKSHAFT ASSEMBLY REPLACE/REPAIR (CONT)

CRANKSHAFT ASSEMBLY REPLACE, REPAIR (CONT) - TM-10-4320-307-24_539

CRANKSHAFT ASSEMBLY REPLACE/REPAIR (CONT) - TM-10-4320-307-24_541

TM-10-4320-307-24 Pump Assembly (Mainline) Diesel Engine Driven 800 GPM NSN 4320-01-193-3430 Manual
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TM 10-4320-307-24 4-17 CRANKSHAFT ASSEMBLY REPLACE/REPAIR (CONT) 9. 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 between thrust surface and journal. 10. Inspect thrust rings for nicks. scratches, cracks, or other damage. Replace If damaged. Measure thickness of thrust rings. Replace rings if they are not the same thickness. 11. Measure connecting rod journals as follows: a. Measure diameter of each connecting rod journal (4) at points A and B along axes X and Y with micrometer. b. The minimum acceptable diameter for con- necting rod journal (4) is 3.122 inches (79.298 mm). If any measurement is outside specified limits, crankshaft must be replaced. However, if connecting rod journals are evenly worn, not out-of-round, and crankshaft journal diameters are within specified limits, the condition may be rectified by replacing connecting rod bearing shells in accordance with paragraph 4-16. Crankshaft Journal Diameters - Inch (mm) Journal Minimum Maximum Worn Limit Connecting 3.1235 3.125 3.122 Rod (79.337) (79.375) (79.298) c. If measurements at point A and B indicate more than 0.0005 inch (0.013 mm) taper per length of journal (4) and/or one set is outside specified limits, the journal is worn into a conical shape and crankshaft must be replaced. d. If measurements along X and Y axes differ. and/or one set is outside specified limits. journal is worn into an oval shape. e. Measure width of connecting rod journals. f. Measure fillet radius at each connecting rod journal using fillet ball gauge set. Fillet radius should measure from 0.1693 to 0.1722 inch (4.30 to 4.50 mm). If any fillet measurement is out of limits, replace crankshaft. Fillet must blend smoothly into journal cheek and must be free of scratches. Polish and smooth any slight imperfections with crocus cloth wet with lubricating oil. 12. Check connecting rod journal bearing clearance in accordance with paragraph 4-16. 4-129

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