Detroit Diesel EPA07, Workshop Manual, Page: 239 / 442

EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE
17.3 INSPECTION OF THE CRANKSHAFT AND RELATED PARTS
Inspect as follows:
EYE INJURY
To avoid injury from fl ying debris when using compressed
air, wear adequate eye protection (face shield or safety
goggles) and do not exceed 276 kPa (40 psi) air pressure.
1. Inspect the crankshaft for cracks.
2. If the crankshaft shows evidence of excessive overheating, replace the crankshaft since the
heat treatment has probably been destroyed.
3. Clean out the oil passages thoroughly with a stiff wire brush. Clean the crankshaft with
fuel oil and dry it with compressed air.
4. Check the crankshaft journal surfaces for score marks and other imperfections. If
excessively scored, replace the crankshaft.
5. Carefully inspect the front end of the crankshaft in the area of the oil seal contact surface
for evidence of a rough or grooved condition. Any imperfections of the oil seal contact
surfaces will result in oil leakage at these points. If excessively scored, replace the
crankshaft.
6. Check the crankshaft thrust surfaces for excessive wear or grooving. If excessively worn,
replace the crankshaft.
7. Inspect the crankshaft gear for damage. Replace if necessary.
8. Check the crankshaft journal run-out.
□
Set journals number 1 and number 7 on a pair of V-blocks
□
Rotate crankshaft and measure journals with a dial indicator
Journal 1 Journal 2 Journal 3 Journal 4 Journal 5 Journal 6 Journal 7
On V-Block 0.040 mm
(0.0015 in.)
0.060 mm
(0.0024 in.)
0.090 mm
(0.0035 in.)
0.060 mm
(0.0024 in.)
0.040 mm
(0.0015 in.)
On V-Block
Table 17-1 Maximum Crankshaft Journal Runout
9. Check journals for damage.
10. Check main and rod bearings for wear or scoring. Replace as necessary.
11. Inspect the thrust washers for wear or scoring. Replace as necessary.
12. Inspect the main cap bolt length. If the length exceeds 200.5 mm (7.89 in), replace the bolt.
13. Inspect the cylinder block journals. Refer to section 42.3.2.
All information subject to change without notice.
DDC-SVC-MAN-0081 2010 Copyright © 2010 DETROIT DIESEL CORPORATION
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