TM55-2840-251-23
SECTION VIII GENERAL MAINTENANCE PROCEDURES (Continued)
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DISASSEMBLY (Cont)
10.
Hardware Identification:
(Cont)
The adoption of this program will make it possible for
service activities to avoid the assembly of parts with
similar physical appearance in locations, which require
high heat-resistant parts. In this regard, it is a
requirement at time of disassembly to segregate all
coded parts, so that two or more will not be scrambled.
This will insure that at subsequent reassembly, the
coded parts are installed in their proper locations.
It is the practice to use bolts with reduced pitch diameter
in the hot section of the engine, to minimize the
possibility of bolt and nut seizure. This practice is
standard with regard to all applications where the parts
are subjected to elevated temperatures. To identify
reduced pitch diameter bolts, check for a 120 degrees
depression in the threaded end of the bolt. This
identifying mark must not be confused with a grinding
center which is common with ground thread bolts.
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