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 TM 55-1905-220-14-4
3-6. PROPULSION SYSTEM (Cont).
(4) Rust preventive.
If parts are not to be used immediately after cleaning, dip them in a rust preventive compound (P/N
6850-00-753-4967). The rust preventive compound should be removed before installing the parts in an engine.
(5) Inspection.
(a)
The purpose of parts inspection is to determine which parts can be used and which must be
replaced. Although the engine overhaul specifications given throughout the text will aid in
determining which parts should be replaced, considerable judgment must be exercised.
(b) The guiding factors in determining the usability of worn parts, which are otherwise in good condition,
is the clearance between the mating parts and the rate of wear on each of the parts. If it is
determined that the rate of wear will maintain the clearances within the specified maximum allowable
until the next overhaul period, the reinstallation of used parts may be justified. Rate of wear of a part
is determined by dividing the amount the part has worn by the hours it has operated.
(c)
Many service replacement parts are available in various undersize and/or oversize as well as
standard sizes. Also, service kits for reconditioning certain parts and service sets which include all
of the parts necessary to complete a particular repair job are available.
(d) A complete discussion of the proper methods of precision measuring and inspection are outside the
scope of this manual. However, every shop kit should be equipped with standard gages, such as dial
bore gages, dial indicators, and inside and outside micrometers.
(6) Assembly.
(a) Following cleaning and inspection, the engine should be assembled using new parts as determined
by the inspection.
(b) Use of the proper equipment and tools makes the job progress faster and produces better results.
Likewise, a suitable working space with proper lighting must be provided.
(c) Keep the working space, the equipment, tools and engine assemblies and parts clean at all times.
The area where assembly operations take place should, if possible, be located away from the
disassembly and cleaning operation. Also, any machining operations should be removed as far as
possible from the assembly area.
3-252
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