TM-5-4310-389-14
5-7.
CRANKSHAFT (ENGINE)
DESCRIPTION
This task covers: Inspect. Replace. Repair.
INITIAL SETUP
Tools:
Equipment conditions:
Hardness tester.
Crankshaft removed (paragraph 5-10).
Micrometer
Materials/parts:
None
INSPECT
a.
Inspect crankshaft for cracks (by magnaflux method).
b.
Remove the gear wheel from the crankshaft.
c.
Support crankshaft at outer main journals on prism-shaped blocks.
d.
Gauging.
1.
Determine the hardness of the journal surfaces with a hardness tester (figure 5-67). Conversions of the
readings to Rockwell C hardness values, for comparison with the specifications (table 4-5), can be effected
with the table included with the instrument.
Figure 5-67. Measuring Journal Hardness with Scleroscope
5-40
