TM-5-4310-389-14
5-6
CRANKCASE (ENGINE)
DESCRIPTION
This task covers: Replace. Repair
INITIAL SETUP
Tools:
Equipment conditions:
Fixture 003-0500
Engine completely disas-
Refacing device 003-0505
sembled (paragraph 5-10).
Precision gauge
Crankshaft removed.
Nozzle tool 003-0798
Micrometer
Materials/parts:
Micrometer frame
Cloth, Lint-free, item 9 Appendix E
General
a.
Carefully clean crankcase, particularly the oil ducts; check for free passage.
b.
Check walls and bearing webs for cracks.
c.
Check condition of bearing bores. If wear marks on bearing shells are not noticeable, check bearing bores with a
precision gauge.
NOTE
If there are signs of wear on the bearing shells, the line of bearing housings can be reworked to an
oversize outside diameter on a line boring machine. It is not permissible to bore out individual
bearing pedestals.
d.
Checking the Preload.
1.
Install crankshaft bearing caps, observing the numbering, into the crankcase. Preload and tighten bolts
according to specifications listed in Appendix F (fixture No. 003-5000).
2.
Set precision gauge to the size indicated in table 4-5 using a micrometer frame (nominal or oversize).
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