Detroit Diesel 4000 Series, Service Manual, Page: 405 / 2706

SERIES 4000 12/16V SERVICE MANUAL
1. Using micrometer, measure main bearings and crankpins of crankshaft in four locations
for out-of-round and surface irregularities; record measured values in Data Sheet.
See Figure 185.
Figure 185 Measuring Crankshaft Journal
[a] If limit values are exceeded, grind crankshaft to next repair size.
[b] If limit values are not exceeded, continue inspection.
Checking Crankshaft Taper
Perform the following steps to check the crankshaft taper:
1. Check crankshaft taper surfaces (arrows) for minor scoring and damage.
[a] If minor scoring or damage is found, polish taper surfaces with emery cloth.
All information subject to change without notice.
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