Detroit Diesel MBE 4000 Service Manual page 124

1.9 CRANKSHAFT ASSEMBLY
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8. Remove the bearing caps.
NOTE:
If the bolts are going to be used again, check their length.
9. Using a micrometer, measure the outside diameter of the main journals. See Figure 1-56.
1. Micrometer
Figure 1-56
NOTE:
To obtain a correct value for crankshaft radial play, the diameters of each bearing bore
and its corresponding journal must belong to the same repair stage (both must be
"Standard," "Undersize - 0.004 inch," etc.).
10. Calculate the radial play (up-and-down movement) of the main bearings on the crankshaft
journals.If the radial play is less than 0.060 mm (0.0024 inch), or more than 0.126 mm
(0.0050 inch) as listed in Table 1-18, then replace the crankshaft.
Description
Main Journal Radial Play
Table 1-18 Crankshaft Radial Play
[a] For the main bearing shell, note the inside diameter of the bearing shell. Example:
D = 4.0875 inches.
s
1-76
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Measuring the Outside Diameter of the Main Journals
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2. Main Journal
mm (inch)
0.060-0.126 (0.0024-0.0050)
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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