Detroit Diesel 4000 Series, Service Manual, Page: 404 / 2706

SERIES 4000 12/16V SERVICE MANUAL
1. Rub down all journals with emery cloth. See Figure 184.
Figure 184 Polishing with Emery Cloth
2. Standardized roughness height (R
z
) of journal sliding surface = 2.5
µ
m to 6.3,
µ
m.
Refer to section Regrinding Crankshaft.
3. Polish all fillets and transitions.
4. Check main bearing and crankpin surfaces for scoring and damage.
[a] If scoring or damage is found, regrind relevant journal to next repair stage.
[b] If no scoring or damage is found, continue inspection.
5. Check thrust washer surface of first main bearing for wear.
[a] If thrust washer surface is worn, regrind to next repair stage.
[b] If thrust washer is not worn, continue inspection.
6. Inspect crankshaft journal for minor scoring or damage.
[a] If minor scoring or damage is found, polish with emery cloth.
[b] If no scoring or damage is found, continue inspection.
Measuring Crankshaft Journal
Perform the following steps to measure the crankshaft journal:
All information subject to change without notice.
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