TM 5-3895-346-14
GENERAL DESCRIPTION
ENGINE OVERHAUL
Rinsing Bath
Provide another tank of similar size containing hot water for rinsing the parts.
Drying
Parts may be dried with compressed air. The heat from the hot tanks will quite frequently complete drying of
the parts without the use of compressed air.
Rust Preventive
If parts are not to be used immediately after cleaning, dip them in a suitable rust-preventive compound. The
rust- preventive compound should be removed before installing the parts in an engine.
INSPECTION
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 by the inspector.
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.
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.
A complete discussion of the proper methods of precision measuring an inspection are outside the scope of this
manual. However, every shop should be equipped with standard gages, such as dial bore gages, dial
indicators, and inside and outside micrometers.
In addition to measuring the used parts after cleaning, the parts should be carefully inspected for cracks, scor-
ing, chipping, and other defects.
ASSEMBLY
Following cleaning and inspection, the engine should be assembled using new parts as determined by the
inspection.
Use of the proper equipment and tools makes the job progress faster and produces better results. Likewise, a
suit- able working space with proper lighting must be provided. The time and money invested in providing the
proper tools, equipment, and space will be repaid many times.
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.
Particular attention should be paid to storing of parts and subassemblies, after removal and cleaning and prior
to assembly, in such a place or manner as to keep them clean. If there is any doubt as to the cleanliness of
such parts, they should be recleaned.
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