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TM 55-1905-220-14-6
General Information - Detroit Diesel N-71 (Cont)
(6) Rust Preventive
If parts are not to be used immediately after cleaning, dip them in a rust preventive compound (NSN 6850-
00-753-4967). The rust preventive compound should be removed before installing the parts in an engine.
7) 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 judgement 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,
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 under-size 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.
(e) In addition to measuring the used parts after cleaning, the parts should be carefully inspected for cracks,
scoring, chipping and other defects.


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