PUMP AS-ENGINE OIL 3318905 - Caterpillar

9L8123 Crankshaft, part of 9L8127 Crankshaft Assembly.9L8122 Crankshaft, part of 9L8128 Crankshaft Assembly.9L8400 Crankshaft, part of 9L8142 Crankshaft Assembly.
Do not grind or polish crankshaft bearing journals. Grinding or polishing removes the hardened surface of the journals, resulting in engine failure.
The bearing journal surface hardness is extremely thin, .0003 to .0005 in. (0.008 to 0.013 mm). It is important to maintain rigid size control on the bearing journals. Connecting rod journal diameter is 2.7500 .0004 in. (69.850 0.010 mm). Connecting rod journal minimum permissible diameter is 2.7486 (69.814 mm). Main bearing journal diameter is 3.5000 .0005 in. (88.900 0.013 mm). Main bearing journal minimum permissible diameter is 3.4985 (88.862 mm). Measure the journals around the diameter to find the maximum wear point. Replace the crankshaft if excessive wear is noted on any journal. To check crankshaft for straightness, support at each end in V-blocks, measure the total indicator reading at the center main journal. The maximum permissible runout is .006 in. (0.15 mm) for 4.1 stroke, .007 in. (0.18 mm) for 4.5 stroke, and .008 in. (0.20 mm) for 5.0 stroke crankshafts.With the crankshaft installed in the cylinder block, check crankshaft end play. End play with new bearings should be .006 .003 in. (0.15 0.08 mm). Maximum allowable end play is .014 in. (0.36 mm).9L9230 Crankshaft, part of 9L7604 Crankshaft Assembly.9L9231 Crankshaft, part of 9L7603 Crankshaft Assembly.9L9232 Crankshaft, part of 9L7605 Crankshaft Assembly.9N8013 Crankshaft, part of 9L6266 Crankshaft Assembly.4N8453 Crankshaft, part of 4N9054 Crankshaft Assembly.4N8454 Crankshaft, part of 4N9055 Crankshaft Assembly.9N300 Crankshaft, part of 9N305 Crankshaft Assembly.9N303 Crankshaft, part of 9N304 Crankshaft Assembly.Reconditioning of these crankshafts can be done by grinding the "journals" (bearing surface on the crankshaft for the connecting rod bearings and main bearings) .010 in. (0.25 mm) or .020 in. (0.51 mm) "undersize" (smaller than the original size).The diameter of the "journals" for the connecting rod bearings is 2.7500 .0004 in. (69.850 0.010 mm). The diameter of the "journals" for the main bearings is 3.5000 .0005 in. (88.900 0.013 mm). The minimum permissible diameter of the "journals" for the connecting rods is 2.7486 in. (69.814 mm). The minimum permissible diameter of the "journals" for the main bearings is 3.4985 in. (88.862 mm). Measure each "journal" in several places around the diameter to find the maximum wear point. If the diameter of any "journal" is smaller than the minimum permissible diameter, grind all of the "journals." Before grinding a crankshaft, check the crankshaft for being straight. To check a crankshaft for being straight, support each end main bearing "journal" in V-blocks. Using a dial indicator, position the indicator at the zero reading then measure the total indicator reading at the other three main bearing "journals." The maximum total indicator reading is .006 in. (0.15 mm) at the center main bearing "journal" and .003 in. (0.08 mm) at the other two main bearing "journals." If total indicator reading is more than that given but less than .030 in.