TM-9-2815-225-34-P
ENGINE, DIESEL: 6 CYLINDER IN-LINE TURBOCHARGED, CUMMINS MODEL NTC-400
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2005
TM-9-2815-225-34-P - Page 178 of 736
TM 9-2815-225-34&P
0016 00
0016 00-2
CRANKSHAFT CLEANING AND INSPECTION (Contd)
1.
For general parts cleaning information, refer to CLEANING, WP 0051 00.
2.
For general parts inspection information, refer to INSPECTION, WP 0051 00.
NOTE
Replace any part that does not pass visual inspection or is
outside specified wear limits.
3.
Inspect crankshaft (1) for cracks, breaks, damage, or wear.
4.
Inspect rear oil seal contact area (3) for wear and grooves.
5.
Using vernier caliper, measure outside diameter of rear oil seal contact area (3). Minimum
diameter is 5.998 in. (15.234 cm).
6.
Inspect front oil seal contact area (6) for wear and grooves.
7.
Using vernier caliper, measure outside diameter of front oil seal contact area (6). Minimum
diameter is 3.625 in. (9.207 cm).
8.
Inspect main bearing halves (8) for pits, scratches, or grooves.
9.
Using micrometer, measure thickness of main bearing halves (8). Minimum thickness is 0.123 in.
(3.124 mm). Maximum thickness is 0.1238 in. (3.144 mm). Wear limit is 0.1215 in. (3.0861 mm).
10.
Using vernier caliper, measure rod bearing journal (5) diameter at three and six o’clock positions.
Minimum diameter is 3.124 in. (7.933 cm).
11.
Using vernier caliper, measure main bearing journal (4) diameter. Minimum diameter is 4.489 in.
(11.426 cm).
NOTE
Prior to measuring thrust ring thickness, place crankshaft on
cylinder block with corresponding bearing halves and caps
installed.
12.
Measure thickness of each thrust ring (9) at different locations. Minimum thrust ring (9)
thickness is 0.245 in. (6.223 mm). If endplay clearance exceeds 0.022 in. (0.559 mm), install
oversize thrust rings.
13.
Inspect two thrust ring pins (10) for damage or wear.
14.
Inspect seven retaining rings (11) for wear, out-of-round, or cracks.
15.
Inspect crankshaft gear (7) for worn, cracked, or broken gear teeth.
16.
Inspect crankshaft gear (7) for loose or worn keyway.
17.
Inspect crankshaft keyway (13) for looseness, wear, or damage.
18.
Using vernier caliper, measure width of keyway (13). Maximum width is 0.375 in. (9.525 mm).
19.
Inspect crankshaft gear step (12) for wear, grooves, or damage.
20.
Using vernier caliper, measure outside diameter of crankshaft gear step (12). Minimum diameter
is 3.761 in. (9.552 cm).
NOTE
Perform steps 21 and 22 for Big Cam I engine only.
21.
Using vernier caliper, measure crankshaft thrust flange (4). Wear greater than 0.003 in. (0.076
mm) requires regrinding to restore flatness.
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