Crankshaft Assembly - Detroit Diesel MBE 4000 Service Manual

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Crankshaft Assembly

The specifications for the torque of the main bearing-cap bolts is listed in Table 1-65.
Crankshaft specifications are listed in Table 1-66. The dimensions for the center bearing shell
and bearing journal are listed in Table 1-67. The crankshaft bearing journal dimensions are
listed in Table 1-68. The main and connecting-rod bearing as well as the main bearing shell
dimensions are listed in Table 1-69 and listed in Table 1-70. The torque values for the crankshaft
counterweight bolts are listed in Table 1-71.
Max. Shaft Length: mm (in.)
156.0 mm (6.14 in.)
156.0 mm (6.14 in.)
156.0 mm (6.14 in.)
156.0 mm (6.14 in.)
Table 1-65 Tightening Stages, Main Bearing-Cap Bolts
Description
Main Bearing and Connecting Rod Journal Hardness
(Rockwell hardness)
Permissible Deviation From True of Crankshaft†
Permissible Out-Of-Round for Main and Connecting-Rod
Bearing Journals - When New or Reground
Permissible Out-Of-Round for Main and Connecting-Rod
Bearing Journals - Wear Limit
Fillet Radii of Main Bearing and Connecting-Rod Bearing
Journals
Crown of Main Bearing Journals and Connecting-Rod
Journals
Main Bearing Outside Diameter (diameter of bearing
shell housing
Permissible Imbalance of Crankshaft‡ -at 400 rpm
* Except as otherwise noted.
†Measure with the crankshaft mounted on the outer main bearing journals.
‡With the pin for the flywheel installed, but without the flywheel, and with the crankshaft mounted on the outer bearings.
Table 1-66 Crankshaft Specifications
Size: mm (in.)
Standard
Undersize - 0.50 (0.020)
Undersize - 1.00 (0.040)
Table 1-67 Bearing Shell and Bearing Journal Width
1-188
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Tightening Stage
Stage 1
Stage 2
Stage 3
Stage 4
Specification in mm (inches)*
53 to 59 HRC
0.09 (0.004)
0.01 (0.0004)
0.02 (0.0008)
4.2-4.5 (0.165-0.177)
0.000-0.004 (0.0000-0.0002)
111.000-111.022 (4.3701-4.3709)
0.6 N·cm (0.05 lb·in)
Center Bearing Shell Width
45.74-45.81 (1.801-1.804)
46.24-46.31 (1.820-1.823)
46.74-46.81 (1.840-1.843)
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Torque Value: N·m (lb·ft)
100 (74)
200 (148)
300-330 (221-243)
additional 90-100 degrees
Center Bearing Journal Width
46.000-46.062 (1.8110-1.8135)
46.500-46.562 (1.8307-1.8331)
47.000-47.062 (1.8504-1.8528)
All information subject to change without notice.
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