Detroit Diesel 4000 Series, Service Manual, Page: 2580 / 2706

SERIES 4000 12/16V SERVICE MANUAL
Crankshaft Bearing Shells
See Figure 1080 for a view of the crankshaft bearing shells tolerance points.
1. Install bearing shells and torque bearing cap according to torque specifications.
2. Measure crankshaft bearing bores.
[a] Determine diameters a, b1, and b2 in measuring planes 1 and 2 and in each case calculate mean values of a,
b1, and b2.
3. Check roundness of bores.
[a] Possible deviations from roundness result from the mean values of a, b1, and b2 in accordance with the equation
0.5 (b1+b2) —a
4. Replace bearing shells.
[a] If deviation from roundness >0.040.
[b] If b1 and b2 are > < 0.040.
[c] With vertical ovality — a < 0.5 (b1+b2) — is not permissible.
Figure 1080 Crankshaft Bearing Shells
All information subject to change without notice.
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